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Stern J, Hildebrand T, Casto K. Women’s Intrasexual Competitiveness and Jealousy Across the Ovulatory Cycle: A Hormone-Based Study. SOCIAL PSYCHOLOGICAL AND PERSONALITY SCIENCE 2022. [DOI: 10.1177/19485506221117712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Research on social status competition among women suggests that underlying hormonal shifts associated with the ovulatory cycle systematically drive alterations in preferences and behavior. Specifically, it is proposed that the fertile window, marked by heightened estradiol and lower progesterone levels, is related to increased psychological motivation for intrasexual social comparison, leading to increasing competitiveness and jealousy. In this pre-registered, longitudinal study, 257 women provided saliva samples for hormone assays, rated the attractiveness of other women, and self-reported intrasexual competitiveness and jealousy across four testing sessions. Multilevel analyses revealed no compelling evidence for (hormone-related) cycle shifts in intrasexual competitiveness, attractiveness ratings, or jealousy. Rather, women higher in intrasexual competitiveness seem to rate other women as more attractive in general. We discuss how our results contribute to a growing body of literature suggesting that women’s social attitudes and preferences are more stable and less hormonally influenced than previously assumed.
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Affiliation(s)
- Julia Stern
- University of Bremen, Germany
- University of Goettingen, Germany
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Expectations about pain and analgesic treatment are shaped by medical providers' facial appearances: Evidence from five online clinical simulation experiments. Soc Sci Med 2021; 281:114091. [PMID: 34126294 DOI: 10.1016/j.socscimed.2021.114091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 04/23/2021] [Accepted: 05/29/2021] [Indexed: 11/23/2022]
Abstract
RATIONALE There is a robust link between patients' expectations and clinical outcomes, as evidenced by the placebo effect. Expectations depend in large part on the context surrounding treatment, including the patient-provider interaction. Prior work indicates that providers' behavior and characteristics, including warmth and competence, can shape patient outcomes. Yet humans rapidly form trait impressions of others before any in-person interaction. It is unknown whether these first impressions influence subsequent health care choices and expectations. OBJECTIVE Our goal was to test whether trait impressions of hypothetical medical providers, based exclusively on facial images, influence the choice of medical providers and expectations about pain and analgesia following hypothetical painful medical procedures. METHOD Across five online experiments, participants (total N = 1108) viewed and made judgments about hypothetical healthcare providers. Experiments 1-4 included computer-generated faces that varied in features associated with competence, while experiment 5 included real faces. We measured how apparent competence affected expectations about pain and anticipated analgesic use in all studies. We also measured warmth and similarity. RESULTS Across five online studies, participants selected providers who appeared more competent, based on facial visual information alone. Further, providers' apparent competence predicted participants' expectations about post-procedural pain and medication use. Participants' perception of their similarity to providers also shaped expectations about pain and treatment outcomes. CONCLUSIONS Results from our experimental simulations suggest that humans develop expectations about pain and health outcomes before even setting foot in the clinic, based exclusively on first impressions. These findings have strong implications for health care, as individuals increasingly rely on digital services to select healthcare providers and even receive treatment, a trend that is exacerbated as the world embraces telemedicine.
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Krems JA, Claessens S, Fales MR, Campenni M, Haselton MG, Aktipis A. An agent-based model of the female rivalry hypothesis for concealed ovulation in humans. Nat Hum Behav 2021; 5:726-735. [PMID: 33495572 DOI: 10.1038/s41562-020-01038-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Accepted: 12/17/2020] [Indexed: 01/29/2023]
Abstract
After half a century of debate and few empirical tests, there remains no consensus concerning why ovulation in human females is considered concealed. The predominant male investment hypothesis states that females were better able to obtain material investment from male partners across those females' ovulatory cycles by concealing ovulation. We build on recent work on female competition to propose and investigate an alternative-the female rivalry hypothesis-that concealed ovulation benefited females by allowing them to avoid aggression from other females. Using an agent-based model of mating behaviour and paternal investment in a human ancestral environment, we did not find strong support for the male investment hypothesis, but found support for the female rivalry hypothesis. Our results suggest that concealed ovulation may have benefitted females in navigating their intrasexual social relationships. More generally, this work implies that explicitly considering female-female interactions may inspire additional insights into female behaviour and physiology.
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Affiliation(s)
- Jaimie Arona Krems
- The Oklahoma Center for Evolutionary Analysis (OCEAN), Department of Psychology, Oklahoma State University, Stillwater, OK, USA
| | - Scott Claessens
- School of Psychology, University of Auckland, Auckland, New Zealand.,Department of Psychology, Arizona State University, Tempe, AZ, USA.,Interdisciplinary Cooperation Initiative, Arizona State University, Tempe, AZ, USA
| | - Melissa R Fales
- Department of Psychology, University of California, Los Angeles, CA, USA.,Center for Behavior, Evolution, and Culture, University of California, Los Angeles, CA, USA
| | - Marco Campenni
- Department of Psychology, Arizona State University, Tempe, AZ, USA.,Interdisciplinary Cooperation Initiative, Arizona State University, Tempe, AZ, USA.,Centre for Ecology and Conservation, University of Exeter, Exeter, UK
| | - Martie G Haselton
- Department of Psychology, University of California, Los Angeles, CA, USA.,Center for Behavior, Evolution, and Culture, University of California, Los Angeles, CA, USA.,Department of Communication, University of California, Los Angeles, CA, USA.,Institute for Society and Genetics, University of California, Los Angeles, CA, USA
| | - Athena Aktipis
- Department of Psychology, Arizona State University, Tempe, AZ, USA. .,Interdisciplinary Cooperation Initiative, Arizona State University, Tempe, AZ, USA. .,Center for Evolution and Medicine, Arizona State University, Tempe, AZ, USA. .,Arizona Cancer Evolution Center, Arizona State University, Tempe, AZ, USA. .,Biodesign Center for Biocomputation, Security and Society, Arizona State University, Tempe, AZ, USA.
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Necka EA, Kardan O, Puts DA, Faig KE, Berman MG, Norman GJ. Visual cues to fertility are in the eye (movements) of the beholder. Horm Behav 2019; 115:104562. [PMID: 31356808 DOI: 10.1016/j.yhbeh.2019.104562] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 07/20/2019] [Accepted: 07/24/2019] [Indexed: 11/17/2022]
Abstract
Past work demonstrates that humans behave differently towards women across their menstrual cycles, even after exclusively visual exposure to women's faces. People may look at women's faces differently as a function of women's menstrual cycles. Analyses of participants' scanpaths (eye movement patterns) while they looked at women at different phases of their menstrual cycles revealed that observers exhibit more consistent scanpaths when examining women's faces when women are in a menstrual cycle phase that typically corresponds with peak fertility, whereas they exhibit more variable patterns when looking at women's faces when they are in phases that do not correspond with fertility. A multivariate classifier on participants' scanpaths predicted whether they were looking at the face of a woman in a more typically fertile- versus non-fertile-phase of her menstrual cycle with above-chance accuracy. These findings demonstrate that people look at women's faces differently as a function of women's menstrual cycles, and suggest that people are sensitive to fluctuating visual cues associated with women's menstrual cycle phase.
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Affiliation(s)
- Elizabeth A Necka
- Department of Psychology, University of Chicago, United States of America.
| | - Omid Kardan
- Department of Psychology, University of Chicago, United States of America
| | - David A Puts
- Department of Anthropology, Pennsylvania State University, United States of America
| | - Kelly E Faig
- Department of Psychology, University of Chicago, United States of America
| | - Marc G Berman
- Department of Psychology, University of Chicago, United States of America
| | - Greg J Norman
- Department of Psychology, University of Chicago, United States of America
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Shoup-Knox ML, Ostrander GM, Reimann GE, Pipitone RN. Fertility-Dependent Acoustic Variation in Women's Voices Previously Shown to Affect Listener Physiology and Perception. EVOLUTIONARY PSYCHOLOGY 2019; 17:1474704919843103. [PMID: 31023082 PMCID: PMC10358420 DOI: 10.1177/1474704919843103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 03/15/2019] [Indexed: 11/16/2022] Open
Abstract
Previous research demonstrates that listeners perceive women's voices as more attractive when recorded at high compared to low fertility phases of the menstrual cycle. This effect has been repeated with multiple voice recording samples, but one stimuli set has shown particularly robust replications. First collected by Pipitone and Gallup (2008), women were recorded counting from 1-10 on approximately the same day and time once a week for 4 weeks. Repeatedly, studies using these recordings have shown that naturally cycling women recorded at high fertility are rated as more attractive compared to voices of the same women at low fertility. Additionally, these stimuli have been shown to elicit autonomic nervous system arousal and precipitate a rise in testosterone levels among listeners. Although previous studies have examined the acoustic properties of voices across the menstrual cycle, they reach little consensus. The current study evaluates Pipitone and Gallup's voice stimuli from an acoustic perspective, analyzing specific vocal characteristics of both naturally cycling women and women taking hormonal contraceptives. Results show that among naturally cycling women, variation in vocal amplitude (shimmer) was significantly lower in high fertility recordings compared to the women's voices at low fertility. Harmonics-to-noise ratio and variation in voice pitch (jitter) also fluctuated systematically across voices sampled at different times during the menstrual cycle, though these effects were not statistically significant. It is possible that these acoustic changes could account for some of the replicated perceptual, hormonal, and physiological changes documented in prior literature using these voice stimuli.
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Affiliation(s)
| | | | | | - R. Nathan Pipitone
- Department of Psychology, Florida Gulf Coast University, Fort Myers, FL, USA
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Wallner B, Windhager S, Schaschl H, Nemeth M, Pflüger LS, Fieder M, Domjanić J, Millesi E, Seidler H. Sexual Attractiveness: a Comparative Approach to Morphological, Behavioral and Neurophysiological Aspects of Sexual Signaling in Women and Nonhuman Primate Females. ADAPTIVE HUMAN BEHAVIOR AND PHYSIOLOGY 2019. [DOI: 10.1007/s40750-019-00111-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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