Publisher: Springer-Verlag (Total: 2626 journals)

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Showing 1 - 200 of 2626 Journals sorted alphabetically
3D Printing in Medicine     Open Access   (Followers: 5)
3D Research     Hybrid Journal   (Followers: 21, SJR: 0.222, CiteScore: 1)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 13, SJR: 0.825, CiteScore: 1)
AAPS J.     Hybrid Journal   (Followers: 31, SJR: 1.118, CiteScore: 4)
AAPS PharmSciTech     Hybrid Journal   (Followers: 9, SJR: 0.752, CiteScore: 3)
Abdominal Radiology     Hybrid Journal   (Followers: 21, SJR: 0.866, CiteScore: 2)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4, SJR: 0.439, CiteScore: 0)
aBIOTECH : An Intl. J. on Plant Biotechnology and Agricultural Sciences     Hybrid Journal   (Followers: 2)
Academic Psychiatry     Full-text available via subscription   (Followers: 31, SJR: 0.53, CiteScore: 1)
Academic Questions     Hybrid Journal   (Followers: 9, SJR: 0.106, CiteScore: 0)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 34, SJR: 0.316, CiteScore: 1)
Acoustical Physics     Hybrid Journal   (Followers: 12, SJR: 0.359, CiteScore: 1)
Acoustics Australia     Hybrid Journal   (Followers: 2, SJR: 0.232, CiteScore: 1)
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.367, CiteScore: 0)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.675, CiteScore: 1)
Acta Biotheoretica     Hybrid Journal   (Followers: 3, SJR: 0.284, CiteScore: 1)
Acta Diabetologica     Hybrid Journal   (Followers: 19, SJR: 1.587, CiteScore: 3)
Acta Endoscopica     Hybrid Journal   (Followers: 1)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.769, CiteScore: 1)
Acta Geochimica     Hybrid Journal   (Followers: 8, SJR: 0.24, CiteScore: 1)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 3, SJR: 0.305, CiteScore: 1)
Acta Geophysica     Hybrid Journal   (Followers: 11, SJR: 0.312, CiteScore: 1)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.588, CiteScore: 3)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.517, CiteScore: 1)
Acta Mathematica     Hybrid Journal   (Followers: 12, SJR: 7.066, CiteScore: 3)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.452, CiteScore: 1)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.379, CiteScore: 1)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.27, CiteScore: 0)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.208, CiteScore: 0)
Acta Mechanica     Hybrid Journal   (Followers: 25, SJR: 1.04, CiteScore: 2)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.607, CiteScore: 2)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 9, SJR: 0.576, CiteScore: 2)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.638, CiteScore: 1)
Acta Neurochirurgica     Hybrid Journal   (Followers: 7, SJR: 0.822, CiteScore: 2)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 3, SJR: 0.376, CiteScore: 1)
Acta Neuropathologica     Hybrid Journal   (Followers: 5, SJR: 7.589, CiteScore: 12)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.334, CiteScore: 1)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 4, SJR: 0.574, CiteScore: 2)
Acta Politica     Hybrid Journal   (Followers: 19, SJR: 0.605, CiteScore: 1)
Activitas Nervosa Superior     Hybrid Journal   (SJR: 0.147, CiteScore: 0)
Adaptive Human Behavior and Physiology     Hybrid Journal   (Followers: 1)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9, SJR: 0.103, CiteScore: 0)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 28, SJR: 0.72, CiteScore: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 11)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 21, SJR: 1.005, CiteScore: 2)
Adolescent Research Review     Hybrid Journal   (Followers: 2)
Adsorption     Hybrid Journal   (Followers: 5, SJR: 0.703, CiteScore: 2)
Advanced Composites and Hybrid Materials     Hybrid Journal  
Advanced Fiber Materials     Full-text available via subscription  
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4, SJR: 0.698, CiteScore: 1)
Advances in Astronautics Science and Technology     Hybrid Journal  
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 42, SJR: 0.956, CiteScore: 2)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 23, SJR: 0.812, CiteScore: 1)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 57, SJR: 1.09, CiteScore: 1)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.144, CiteScore: 0)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 36, SJR: 1.64, CiteScore: 2)
Advances in Manufacturing     Hybrid Journal   (Followers: 5, SJR: 0.475, CiteScore: 2)
Advances in Neurodevelopmental Disorders     Hybrid Journal   (Followers: 2)
Advances in Operator Theory     Hybrid Journal   (Followers: 4)
Advances in Polymer Science     Hybrid Journal   (Followers: 49, SJR: 1.04, CiteScore: 3)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 1.075, CiteScore: 3)
Advances in Traditional Medicine     Hybrid Journal   (Followers: 4)
Adversity and Resilience Science : J. of Research and Practice     Hybrid Journal   (Followers: 2)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 9)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.517, CiteScore: 1)
Aerobiologia     Hybrid Journal   (Followers: 4, SJR: 0.673, CiteScore: 2)
Aerosol Science and Engineering     Hybrid Journal  
Aerospace Systems     Hybrid Journal   (Followers: 1)
Aerotecnica Missili & Spazio : J. of Aerospace Science, Technologies & Systems     Hybrid Journal  
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 12, SJR: 0.825, CiteScore: 1)
Affective Science     Hybrid Journal   (Followers: 2)
African Archaeological Review     Hybrid Journal   (Followers: 20, SJR: 0.862, CiteScore: 1)
Afrika Matematika     Hybrid Journal   (Followers: 3, SJR: 0.235, CiteScore: 0)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.39, CiteScore: 1)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.67, CiteScore: 2)
Agricultural Research     Hybrid Journal   (Followers: 7, SJR: 0.276, CiteScore: 1)
Agriculture and Human Values     Open Access   (Followers: 15, SJR: 1.173, CiteScore: 3)
Agroforestry Systems     Open Access   (Followers: 20, SJR: 0.663, CiteScore: 1)
Agronomy for Sustainable Development     Open Access   (Followers: 18, SJR: 1.864, CiteScore: 6)
AI & Society     Hybrid Journal   (Followers: 9, SJR: 0.227, CiteScore: 1)
AIDS and Behavior     Hybrid Journal   (Followers: 17, SJR: 1.792, CiteScore: 3)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 6, SJR: 0.862, CiteScore: 3)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 7, SJR: 0.531, CiteScore: 0)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.583, CiteScore: 1)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 1.095, CiteScore: 1)
Algorithmica     Hybrid Journal   (Followers: 9, SJR: 0.56, CiteScore: 1)
Allergo J.     Full-text available via subscription   (Followers: 2, SJR: 0.234, CiteScore: 0)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 1.11, CiteScore: 3)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 2)
AMBIO     Hybrid Journal   (Followers: 9, SJR: 1.569, CiteScore: 4)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 17, SJR: 0.951, CiteScore: 3)
American J. of Community Psychology     Hybrid Journal   (Followers: 32, SJR: 1.329, CiteScore: 2)
American J. of Criminal Justice     Hybrid Journal   (Followers: 9, SJR: 0.772, CiteScore: 1)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 20, SJR: 0.46, CiteScore: 1)
American J. of Dance Therapy     Hybrid Journal   (Followers: 8, SJR: 0.181, CiteScore: 0)
American J. of Potato Research     Hybrid Journal   (Followers: 3, SJR: 0.611, CiteScore: 1)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 22, SJR: 0.314, CiteScore: 0)
American Sociologist     Hybrid Journal   (Followers: 16, SJR: 0.35, CiteScore: 0)
Amino Acids     Hybrid Journal   (Followers: 7, SJR: 1.135, CiteScore: 3)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 11, SJR: 0.211, CiteScore: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 6, SJR: 0.536, CiteScore: 1)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 6)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32, SJR: 0.978, CiteScore: 3)
Anatomical Science Intl.     Hybrid Journal   (Followers: 3, SJR: 0.367, CiteScore: 1)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.177, CiteScore: 5)
Animal Cognition     Hybrid Journal   (Followers: 23, SJR: 1.389, CiteScore: 3)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.192, CiteScore: 0)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.097, CiteScore: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4, SJR: 0.438, CiteScore: 0)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.429, CiteScore: 0)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.197, CiteScore: 1)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 19, SJR: 1.042, CiteScore: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 4, SJR: 0.932, CiteScore: 1)
Annals of Data Science     Hybrid Journal   (Followers: 13)
Annals of Dyslexia     Hybrid Journal   (Followers: 11, SJR: 0.85, CiteScore: 2)
Annals of Finance     Hybrid Journal   (Followers: 37, SJR: 0.579, CiteScore: 1)
Annals of Forest Science     Hybrid Journal   (Followers: 7, SJR: 0.986, CiteScore: 2)
Annals of Functional Analysis     Hybrid Journal   (Followers: 3)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.228, CiteScore: 1)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.043, CiteScore: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 14, SJR: 0.413, CiteScore: 1)
Annals of Microbiology     Hybrid Journal   (Followers: 13, SJR: 0.479, CiteScore: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 4, SJR: 0.687, CiteScore: 2)
Annals of Operations Research     Hybrid Journal   (Followers: 11, SJR: 0.943, CiteScore: 2)
Annals of Ophthalmology     Hybrid Journal   (Followers: 14)
Annals of PDE     Hybrid Journal  
Annals of Regional Science     Hybrid Journal   (Followers: 9, SJR: 0.614, CiteScore: 1)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 11, SJR: 0.239, CiteScore: 1)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 19, SJR: 1.986, CiteScore: 4)
Annals of Telecommunications     Hybrid Journal   (Followers: 9, SJR: 0.223, CiteScore: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 1.495, CiteScore: 1)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.834, CiteScore: 2)
Apidologie     Hybrid Journal   (Followers: 5, SJR: 1.22, CiteScore: 3)
APOPTOSIS     Hybrid Journal   (Followers: 9, SJR: 1.424, CiteScore: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 3, SJR: 0.294, CiteScore: 1)
Applications of Mathematics     Hybrid Journal   (Followers: 3, SJR: 0.602, CiteScore: 1)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 42, SJR: 0.571, CiteScore: 2)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 20, SJR: 0.21, CiteScore: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 4, SJR: 0.49, CiteScore: 0)
Applied Composite Materials     Hybrid Journal   (Followers: 53, SJR: 0.58, CiteScore: 2)
Applied Entomology and Zoology     Partially Free   (Followers: 7, SJR: 0.422, CiteScore: 1)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.733, CiteScore: 3)
Applied Geophysics     Hybrid Journal   (Followers: 11, SJR: 0.488, CiteScore: 1)
Applied Intelligence     Hybrid Journal   (Followers: 15, SJR: 0.6, CiteScore: 2)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.319, CiteScore: 1)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 10, SJR: 0.886, CiteScore: 1)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (Followers: 1, SJR: 0.17, CiteScore: 0)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.461, CiteScore: 1)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 70, SJR: 1.182, CiteScore: 4)
Applied Physics A     Hybrid Journal   (Followers: 11, SJR: 0.481, CiteScore: 2)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 27, SJR: 0.74, CiteScore: 2)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.519, CiteScore: 2)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 12, SJR: 0.316, CiteScore: 1)
Applied Solar Energy     Hybrid Journal   (Followers: 22, SJR: 0.225, CiteScore: 0)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 6, SJR: 0.542, CiteScore: 1)
Aquaculture Intl.     Hybrid Journal   (Followers: 26, SJR: 0.591, CiteScore: 2)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 2)
Aquatic Ecology     Hybrid Journal   (Followers: 38, SJR: 0.656, CiteScore: 2)
Aquatic Geochemistry     Hybrid Journal   (Followers: 3, SJR: 0.591, CiteScore: 1)
Aquatic Sciences     Hybrid Journal   (Followers: 14, SJR: 1.109, CiteScore: 3)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.303, CiteScore: 1)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 2, SJR: 0.319, CiteScore: 1)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 24, SJR: 1.052, CiteScore: 2)
Archaeologies     Hybrid Journal   (Followers: 13, SJR: 0.224, CiteScore: 0)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.725, CiteScore: 1)
Archival Science     Hybrid Journal   (Followers: 70, SJR: 0.745, CiteScore: 2)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.186, CiteScore: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3, SJR: 0.909, CiteScore: 1)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 3.93, CiteScore: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6, SJR: 0.79, CiteScore: 2)
Archives and Museum Informatics     Hybrid Journal   (Followers: 181, SJR: 0.101, CiteScore: 0)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6, SJR: 1.41, CiteScore: 5)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 1.006, CiteScore: 2)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14, SJR: 0.773, CiteScore: 2)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 19, SJR: 0.956, CiteScore: 2)
Archives of Microbiology     Hybrid Journal   (Followers: 10, SJR: 0.644, CiteScore: 2)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 10, SJR: 1.146, CiteScore: 2)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 0.71, CiteScore: 2)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 11, SJR: 1.493, CiteScore: 3)
Archives of Toxicology     Hybrid Journal   (Followers: 18, SJR: 1.541, CiteScore: 5)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 0.973, CiteScore: 2)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 18, SJR: 1.274, CiteScore: 3)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 0.946, CiteScore: 3)
ArgoSpine News & J.     Hybrid Journal  
Argumentation     Hybrid Journal   (Followers: 6, SJR: 0.349, CiteScore: 1)
Arid Ecosystems     Hybrid Journal   (Followers: 3, SJR: 0.2, CiteScore: 0)
Arkiv för Matematik     Hybrid Journal   (Followers: 1, SJR: 0.766, CiteScore: 1)
arktos : The J. of Arctic Geosciences     Hybrid Journal  
Arnold Mathematical J.     Hybrid Journal   (Followers: 1, SJR: 0.355, CiteScore: 0)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.839, CiteScore: 2)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.131, CiteScore: 0)

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Similar Journals
Journal Cover
Adaptive Human Behavior and Physiology
Number of Followers: 1  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Online) 2198-7335
Published by Springer-Verlag Homepage  [2626 journals]
  • Testosterone and Fathers’ Parenting Unraveled: Links with the Quantity
           and Quality of Father-Child Interactions
    • Abstract: Objective Individual differences in quality of father involvement in caregiving might in part be explained by fathers’ testosterone (T) levels. We examined the links between fathers’ (n = 32) salivary T levels, amount of time spent with their child (12–30 months of age), type of father-child interaction, and fathers’ sensitivity. Methods During two home visits, video observations of father-child interactions were conducted to measure fathers’ sensitivity during a challenging and harmonious interaction. Fathers’ saliva was collected several times throughout the day on a working day and on the home visit days, including right before and after each father-child interaction. Results Fathers’ T secretion throughout the day was lower on home visit days (i.e., days with a higher amount of time spent with their child) than on a working day. For both challenging and harmonious father-child interactions, mean T levels did not differ before and after father-child interactions. However, individual changes in fathers’ T levels during the father-child interactions did predict fathers’ sensitivity. Specifically, the more T increased during the challenging interaction, or decreased during the harmonious interaction, the more sensitive the father was during that interaction as well as during a subsequent interaction. Conclusions Parenting quality is most optimal when fathers’ T system reacts in the expected direction given the context of the father-child interaction, i.e., a T decrease during a harmonious interaction and a T increase during a challenging interaction. Our study underscores the importance of examining the interplay between biology, behavior, and caregiving context in fathers’ parenting.
      PubDate: 2019-09-01
  • A Comparison of men’s Life History, Aging, and Testosterone Levels among
           Datoga Pastoralists, Hadza Foragers, and Qom Transitional Foragers
    • Abstract: Objectives Relative to industrialized populations, men from subsistence groups exhibit lower testosterone values and more modest declines with age. Limited energy availability has been hypothesized to suppress testosterone production, particularly during young adulthood when testosterone levels are highest, resulting in a flatter trajectory of age-decline. Energetic constraint, however, is not unique to the evolutionary ecology of humans, and yet significant age-related testosterone decline is observed in numerous species of wild primates. Conversely, human life history is distinguished by extensive bi-parental care and male provisioning. Because fathers show decreased testosterone with parenting effort, we argue that within more naturalistic and evolutionarily relevant ecologies, natural fertility and earlier reproduction suppresses testosterone in emerging adulthood such that a lower relative baseline dictates less age-decline across the remaining lifespan. Methods We examine men’s testosterone levels as contrasting functions of energetic status and paternal involvement across three traditional populations with substantial variability in men’s nutritional condition and parental investment. Anthropometric and demographic data along with saliva samples were collected from 70 Datoga, 29 Hadza, and 43 Qom men, ages 20–72 years. Results Population variation in salivary testosterone was greatest at younger ages and patterned so paternal involvement associated with lower morning and evening testosterone, along with diminished age-decline in both measures. Men’s energetic status as indicated by body mass index was not associated with testosterone values or age-related decline. Conclusions Within socioecological contexts of smaller scale society, these data suggest that blunted age-decline in men’s testosterone levels is primarily due to population variation in parental investment rather than energetic constraint.
      PubDate: 2019-09-01
  • I Don’t Sweat my Future: Future-Selves, Personality, and Skin
    • Abstract: Objective Future-selves (both positive and negative) have been shown to be related to self-esteem, efficacy, meaning, continuity, and social acceptance. Control beliefs (beliefs about whether actions can bring about desired outcomes) as well as locus of control (internal or external) may impact how individuals see their future and their perception of what can be done to create or change the future. Machiavellian personality traits are associated with external locus of control, while conscientiousness is associated with internal locus of control. Methods We measured galvanic skin response (GSR), a widely used measure of physiological arousal, in 84 study participants while they described possible future selves, one positive and one negative, and completed questionnaires about personality traits. Results Higher conscientiousness was associated with lower skin conductance when describing positive future selves, whereas higher scores on the Machiavellian Personality Assessment questionnaire were correlated with lower skin conductance when describing negative future selves. Conclusion Conscientious individuals are confident in their ability to control their future, thus explaining their lower arousal when describing positive future selves. Machiavellian individuals view the world more negatively but believe they can handle negative situations, thus explaining their lower arousal when describing negative future selves.
      PubDate: 2019-09-01
  • Why Be Generous' Tests of the Partner Choice and Threat Premium Models
           of Resource Division
    • Abstract: Objective The ability to divide resources is crucial for a social and cooperative species like humans, but how humans divide resources remains unclear. Recent results using economic games have suggested conflicting models: The ‘partner choice’ perspective argues that generosity is (in part) a bid for an ongoing cooperative relationship, so generosity is expected to be elicited by cues of cooperative partner value. The ‘threat premium’ perspective argues that generosity is (in part) an attempt to avoid violent retaliation, so generosity is expected to be elicited by cues of threat potential. Methods We tested these competing hypotheses using a dyad study in which pairs of undergraduate participants (N = 312) had a half-hour face-to-face conversation, evaluated each other on components of cooperative partner value and physical dominance, and completed 4 economic tasks comprising 7 resource division decisions. Results Generosity was uniquely predicted by cues of the ability to produce material benefits in an ancestral environment, this effect was stronger for men, and generosity tracked other measures of social attraction. In contrast, the partner’s physical dominance did not predict generosity. Conclusions We observed support for the partner choice approach to resource divisions. Implications for the study of social preferences and resource divisions are discussed.
      PubDate: 2019-09-01
  • Testosterone and Cortisol Interact to Predict Within-Team Social Status
           Hierarchy among Olympic-Level Women Athletes
    • Abstract: Objectives The dual-hormone hypothesis posits that social status is positively related to testosterone levels when cortisol levels are relatively low and negatively related to testosterone levels when cortisol is high. In the present study, we test this hypothesis with Olympic-level women athletes using a novel status-hierarchy generation task that establishes rank-order among teammates along three dimensions: leadership ability, popularity, and skill. Methods Participants completed the hierarchy generation task and then, testosterone and cortisol levels were obtained from samples provided on a neutral-day baseline and immediately prior to competing in an international match. Results The interaction between cortisol and testosterone predicted social status among teammates for both baseline and pre-match samples. Specifically, there was a negative association between testosterone and status for those who were relatively high in cortisol. Conclusions These results provide support for the dual-hormone hypothesis using a new, ecologically valid method for determining rank-order among members of a social group, in a special population of women athletes competing at the highest level of their sport.
      PubDate: 2019-09-01
  • Quantity-Quality Trade-Offs May Partially Explain Inter-Individual
           Variation in Psychopathy
    • Abstract: Objective The examination of ultimate factors that maintain genetic (and consequently phenotypic) variance in a behavioral trait represents one of the key goals of evolutionary ecology of personality. One of these factors are adaptive trade-offs: if a trait is involved in a trade-off, than natural selection cannot deplete its genetic variance. We used this theoretical framework to examine psychopathy, a behavioral syndrome consisting of deceitful behavior, emotional coldness and recklessness. Relying on previous research, we assumed that psychopathy elevates fertility but diminishes offspring quality, thus contributing to quantity-quality trade-off. Method The research sample was consisted of 635 individuals with at least one child, who were at the end of their reproductive phase. We examined psychopathy traits of these individuals, together with parental investment via their offspring ratings. Furthermore, we collected the measures of offspring Covitality (combined physical and mental health) and Residual reproductive value (expected future fitness in offspring) as the measures of offspring quality. We used parental reproductive success as an indicator of offspring quantity. Results Research results confirmed the hypotheses. Psychopathic traits had small positive relations with the number of children and negative associations with parental investment, Covitality and residual reproductive value in offspring. Mediation model that depicted parental investment as the mediator of the psychopathy-offspring quality link had a good fit to the data. Conclusions Research findings have high heuristic potential because they provide an insight in how natural selection can preserve variation in psychopathy.
      PubDate: 2019-06-01
  • Further Evidence that Facial Width-to-Height Ratio and Global Facial
           Masculinity Are Not Positively Associated with Testosterone Levels
    • Abstract: Objectives Facial masculinity, as for example measured by the facial width-to-height ratio (fWHR) or the global facial masculinity index, has been associated with a vast range of behavioural traits, including dominance and aggression. Further, facial masculinity is thought to be influenced by testosterone (T) levels as an underlying mechanism. However, a recent meta-analysis on fWHR and T levels provided non-significant associations in men, which we wanted to examine further in men and additionally in women. Methods We examined whether fWHR and global facial masculinity are positively associated with salivary baseline T and T reactivity in 140 men (age 18–34 years), as well as with salivary baseline T and hair T concentrations in 151 women (age 18–35 years). Results No associations of salivary baseline T, T reactivity or hair T levels with fWHR or global facial masculinity were observed. Additional analyses revealed sex differences in sexual dimorphism in fWHR and global facial masculinity: men had generally higher global facial masculinity compared to women, but unexpectedly a lower fWHR. Conclusions Overall, our results provide further evidence that neither fWHR nor global facial masculinity are related to T levels and question earlier findings on male-biased sexual dimorphism in fWHR.
      PubDate: 2019-06-01
  • Sexual Attractiveness: a Comparative Approach to Morphological, Behavioral
           and Neurophysiological Aspects of Sexual Signaling in Women and Nonhuman
           Primate Females
    • Abstract: Objective and Methods This review focuses on comparative data in nonhuman primates and humans in relation to signaling secondary sex characteristics (SSC), sexual behavior, and neurophysiology of sexuality during the female cycle. Results In monkeys and apes no clear distinction can be drawn between sex as a reproductive, social, or a pleasurable activity. Although female sexual behavior is not limited to a specific phase of the menstrual cycle, changes in body morphology and in behavior and psychology (for example, in feeding, risk taking, and mood) can occur across the cycle. In human and nonhuman primates, homologous biological mechanisms including specific areas of the brain, sex steroids, and receptors are involved in regulating female sexuality. Important aspects of this regulation include the interaction between the subcortical reward system and the social brain network and its projection to the prefrontal cortex. In humans, females advertise SSC permanently after the onset of puberty, but without significant changes across the cycle, whereas in other primate species, female sexual signaling can vary significantly across cycle stages and in fertile and non-fertile phases of the life cycle. Conclusion A great deal is now known about the regulation of female sexuality in primates and the use of sexual signals in terms of their variable expression and their information content for males. Human research has also elucidated the cultural mechanisms through which women communicate about their sexuality, including clothes and make-up. A full understanding of female sexuality in humans, therefore, requires knowledge of culture-biology interactions.
      PubDate: 2019-06-01
  • Endocrine Correlates of Social Comparison in Couple Relationships
    • Abstract: Objectives This study employed an experimental design that induced social comparison in couples by systematically varying performance feedback in a manipulated pretend IQ test. Methods Sixty-two heterosexual couples were randomly assigned to four experimental groups, in which either the man (1) or the woman (2) was provided with superior feedback and compared to couples which received equal feedback (3) or no feedback (4). The biopsychological responses were assessed using repeated measures of mood, levels of the gonadal hormones testosterone (T) and estradiol (E2), and the stress hormone cortisol (C) in both partners. Results Compared to the men, the entire female sample responded to the test with a decrease in T. Women who received superior feedback showed a unique endocrine profile, characterized by an immediate increase in E2 and a delayed decrease in T. In contrast to men, women’s mood decreased in all conditions except for the superior feedback. Conclusions Our results indicate that women may be physiologically and subjectively more strongly affected by comparison processes with their partners in the dimension of skills and achievement. Moreover, our findings are the first to show that in romantic relationships, the endocrine correlates of social comparison may include an intriguing interplay between the steroid hormones T and E2, but not C.
      PubDate: 2019-06-01
  • Cross-Cultural Variation in women’s Preferences for men’s Body
    • Abstract: Objectives According to the ectoparasite avoidance hypothesis, natural selection has shaped human hairlessness to reduce the potential for the body to host disease carrying ectoparasites. However, men retain sexually dimorphic and conspicuous patches of facial and body hair. The ectoparasite avoidance hypothesis also proposes that sexual selection via women’s mate preferences for reduced hirsutism has further elaborated upon the reduction in body hair and could explain variation in women’s preferences for body hair in men. The current study tests this hypothesis using cross-cultural data from 30 countries on women’s preferences for chest hair. Methods We test whether heterosexual women’s (N = 3436) preferences for reduced hirsutism are most pronounced in countries with higher disease and parasite levels or whether other social and economic factors previously shown to influence preferences for facial masculinity and beardedness predict women’s preferences for chest hair. Results We found that preferences were unrelated to past or current disease rates. Instead, preferences for body hair were stronger among women who were older, had strong preferences for facial hair, and were from countries that had male-biased sex ratios, higher human development indices, and lower education indices. Women’s body hair preferences were also associated with facial masculinity preferences and gender empowerment. However, neither these terms, nor human development indices or education indices were individually significant in their contributions to the family of best-fit models and we suggest caution when interpreting their significance. Conclusions Women’s preferences for body hair may be strongest among women from countries where male-male competition is higher and preferences for beardedness are stronger rather than where prevailing ecological conditions my impact on maternal and offspring survival.
      PubDate: 2019-06-01
  • Experimentally-Induced Inflammation Predicts Present Focus
    • Abstract: Objective Here, we provide an experimental test of the relationship between levels of proinflammatory cytokines and present-focused decision-making. Methods We examined whether increases in salivary levels of proinflammatory cytokines (interleukin-1β and interleukin-6) engendered by visually priming immunologically-relevant threats (pathogen threat, physical harm) and opportunities (mating) predicted temporal discounting, a key component of present-focused decision-making. Results As hypothesized, results revealed that each experimental manipulation led to a significant rise in both salivary interleukin-1β and interleukin-6. Moreover, post-manipulation levels of each cytokine independently predicted temporal discounting across conditions. These results were not moderated by pre-manipulation levels of either cytokine, nor were they found using the difference between pre- and post-manipulation levels of cytokines as a predictor. Conclusions Together, these results suggest that levels of proinflammatory cytokines may play a mechanistic role in the desire for immediately available rewards.
      PubDate: 2019-06-01
  • Response to Commentaries: Life History Genetics, Fluid Intelligence, and
           Extended Phenotypes
    • PubDate: 2019-03-01
  • Sexual Selection and Extended Phenotypes in Humans
    • PubDate: 2019-03-01
  • On the Underlying Cognitive Adaptations for Extended Phenotype Expression
           and Evaluation
    • PubDate: 2019-03-01
  • Do Psychosocial Factors Moderate the Relation between Testosterone and
           Female Sexual Desire' The Role of Interoception, Alexithymia, Defense
           Mechanisms, and Relationship Status
    • Abstract: Objectives Low sexual desire is a common complaint among women in the reproductive years. There is controversy regarding the relationship between testosterone (T) and female desire, but there is also lack of research on moderators. Lack of awareness of effects of T on emotions and bodily sensations might interfere with the subjective experience of desire. Moreover, T appears to be more important for searching and competing for partners than for long-term pair bonding. Therefore, we examined if interoception, alexithymia, maladaptive psychological defenses, and relationship status, moderated the relationship between salivary T and female desire. Methods One hundred sixty eight Portuguese women of reproductive age completed the desire dimension of the Female Sexual Function Index, the Toronto Alexithymia Scale (TAS-20), and the Defense Style Questionnaire (DSQ-40). Interoception was determined by a heartbeat detection task. Participants reported if they had a regular sexual partner. Luminescence immunoassays were used to determine salivary T. Results Three multiple regressions models revealed that, among unpartnered women, higher desire was predicted by the combinations of 1) higher T and lesser alexithymia, 2) higher T and less use of maladaptive defenses, 3) higher T and greater interoception. For partnered women, neither T nor the interactions of T with indices of emotional and bodily awareness predicted desire. Conclusions These findings provide preliminary evidence that T is more important for the desire of unpartnered women, and that lack of conscious awareness of emotions and bodily sensations interferes with the effects of T on the subjective experience of desire.
      PubDate: 2019-03-01
  • An Updated Theoretical Framework for Human Sexual Selection: from Ecology,
           Genetics, and Life History to Extended Phenotypes
    • Abstract: Objectives Sexual selection typically centers on bodily and psychological traits. Non-bodily traits ranging from housing and vehicles through art to social media can, however, influence sexual selection even in absence of the phenotype proper. The theoretical framework of human sexual selection is updated in this article by unifying four theoretical approaches and conceptualizing non-bodily traits as extended phenotypic traits. Methods Existing research is synthesized with extended phenotype theory, life history theory, and behavioral ecology. To test population-level hypotheses arising from the review, ecological and demographic data on 122 countries are analyzed with multiple linear regression modelling. Results A four-factor model of intelligence, adolescent fertility, population density, and atmospheric cold demands predicts 64% of global variation in economic complexity in 1995 and 72% of the variation in 2016. Conclusions The evolutionary pathways of extended phenotypes frequently undergo a categorical broadening from providing functional benefits to carrying signalling value. Extended phenotypes require investments in skills and bioenergetic resources, but they can improve survival in high latitudes, facilitate the extraction of resources from the environment, and substantially influence sexual selection outcomes. Bioenergetic investments in extended phenotypes create individual- and population-level tradeoffs with competing life history processes, exemplified here as a global tradeoff between adolescent fertility and economic complexity. The merits of the present model include a more systematic classification of sexual traits, a clearer articulation of their evolutionary-developmental hierarchy, and an analysis of ecological, genetic, and psychological mechanisms that modulate the flow of energy into extended phenotypes and cultural innovations.
      PubDate: 2019-03-01
  • Male Facial Attractiveness, Dominance, and Health and the Interaction
           between Cortisol and Testosterone
    • Abstract: Objectives The dual-hormone hypothesis suggests that associations of testosterone (T) with certain behavioral tendencies are stronger when cortisol (C) levels are low simultaneously. A range of studies provided supporting evidence for TxC interaction effects, for example on dominance and risk-taking behaviors. However, concerning perceptions of facial characteristics the evidence is mixed, with a recent study reporting a positive association between perceived facial dominance and T among men with higher C. Methods We sought to further examine links of observer-rated facial attractiveness, dominance and health (based on photographs of N = 165 men) with baseline T, competition-induced T reactivity, and their interaction with baseline C. Results There was some evidence that baseline T and the interaction of T reactivity with baseline C positively predicted facial dominance, however these were not robust when including control variables. Conclusions Since no effects were found for perceived attractiveness and health, our results suggest that associations of perceived facial characteristics with baseline T, T reactivity and their interactions with baseline C are rather weak.
      PubDate: 2019-03-01
  • The Differences Between Winners and Losers in Competition: the Relation of
           Cognitive and Emotional Aspects During a Competition to Hemodynamic
    • Abstract: Objectives Sympathetic nervous activity plays an important role in behavior related to competition. However, the hemodynamic response patterns of winners and losers during competition remain largely unknown. This study examined the differences between winners’ and losers’ hemodynamic and psychological responses (their evaluation of perceived demands and resources and their positive and negative emotions) to competition. Methods The participants included 30 university students, who completed a competitive mirror-drawing task (three times) in pairs as their cardiac output (CO) and total peripheral resistance (TPR) were measured. Additionally, they were required to answer a question regarding their subjective psychological state before and during the competition. The participants were assigned to a Winner or a Loser group based on outcomes. Results The Winner group presented greater CO changes than the Loser group, while the Loser group displayed greater TPR changes than the Winner group. Moreover, the Winner group scored significantly higher on resource/demand evaluation than the Loser group. Although we observed no significant differences in terms of negative emotion, only the Winner group showed increased positive emotions from precompetition to competition. Conclusions This evidence suggests that winners and losers display different patterns of enhanced sympathetic-cardiovascular responses to competition; winners are characterized by a myocardial response pattern, while losers are characterized by a vascular response pattern. The psychological responses that depend on one’s position during a competition provide information on the quality of hemodynamic responses to competition.
      PubDate: 2019-03-01
  • The Effect of Negative Implicit Affect, Prime Visibility, and Gender on
           Effort-Related Cardiac Response
    • Abstract: Objectives Based on the Implicit-Affect-Primes-Affect (IAPE) model (Gendolla 2012, 2015), we investigated the effect of affect primes’ visibility on effort-related cardiac response. Methods Participants worked on a cognitive “parity task” with integrated pictures of sad vs. angry faces that were briefly flashed (25 ms) vs. clearly visible (780 ms). We recorded cardiac pre-ejection period (PEP) to assess effort mobilization. Results As expected, PEP reactivity in the sadness-prime condition was stronger than in the anger-prime condition when the primes were briefly flashed, while the opposite pattern occurred when the affect primes were clearly visible. However, these effects only occurred for men, but not for women, as indicated by a significant prime x prime visibility x gender interaction. Conclusions These findings provide new evidence for the role of prime visibility as a moderator of automatic effort mobilization—and suggest that this moderator effect applies especially to men.
      PubDate: 2018-12-01
  • Male and Female Nipples as a Test Case for the Assumption that Functional
           Features Vary Less than Nonfunctional Byproducts
    • Abstract: Objectives Evolutionary researchers have sometimes taken findings of low variation in the size or shape of a biological feature to indicate that it is functional and under strong evolutionary selection, and have assumed that high variation implies weak or absent selection and therefore lack of function. Methods To test this assumption we compared the size variation (using a mean-adjusted measure of absolute variability) of the functional human female nipple (defined as the nipple-areola complex) with that of the non-functional human male nipple. Results We found that female nipples were significantly more variable than male nipples, even after controlling for body mass index, testing-room temperature, bust size in women, and chest size in men. Conclusions Morphological variation in a feature should not be used by itself to infer whether or not the feature is functional or under selection.
      PubDate: 2018-12-01
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