Keith M Welker

Keith M Welker
University of Massachusetts Boston | UMB · Department of Psychology

PhD

About

45
Publications
16,769
Reads
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1,135
Citations
Additional affiliations
July 2014 - July 2015
University of Colorado Boulder
Position
  • PostDoc Position
July 2014 - July 2015
University of Colorado Boulder
Position
  • PostDoc Position

Publications

Publications (45)
Preprint
Emotion dysregulation is a core component of bipolar disorder (BD). However, there is a critical gap concerning the measurement of emotion-relevant neuroendocrine processes in this population. The present investigation examined neuroendocrine profiles (i.e., cortisol and testosterone) alongside emotional experiences across three consecutive days in...
Article
Full-text available
Objective Hormones are often conceptualized as biological markers of individual differences and have been associated with a variety of behavioral indicators and characteristics, such as mating behavior or acquiring and maintaining dominance. However, before researchers create strong theoretical models for how hormones modulate individual and social...
Article
Intergroup competitions such as democratic elections can intensify intergroup polarization and conflict. Partisan attitudes toward the elected leader can also shift from before to after an election, but the biology underlying these attitudinal shifts remains largely unknown. An important factor could be the hormone testosterone, which is theorized...
Article
Testosterone has been suggested to influence individuals' economic decision making, yet the effects of testosterone on economic behavior are not well-understood and existing research is equivocal. In response, in three studies, we examined the extent to which testosterone affected or was associated with several different facets of economic decision...
Article
Adrenocortical attunement—similarity in hypothalamic-pituitary-adrenal (HPA) axis activity—has been well-documented in close relationships (e.g., between romantic partners, parents and children, and close friends). However, little is known about adrenocortical attunement during early relationship formation. In the current study, we examine dyadic a...
Article
Full-text available
Background Both bipolar disorder and major depressive disorder are characterized by difficulties in emotion regulation. Little is known about which specific emotion regulatory patterns may be transdiagnostic versus disorder specific, and how such patterns change as a function of current mood states. Methods This preliminary investigation examined...
Preprint
Full-text available
**Objective**: Hormones are often conceptualized as biological markers of individual differences and have been associated with a variety of behavioral indicators and characteristics, such as mating behavior or acquiring and maintaining dominance. However, before researchers create strong theoretical models for how hormones modulate individual and s...
Chapter
Self-expansion theory suggests that people are motivated to broaden the self (Aron & Aron, 1986; Aron & Aron, 1996; Aron, Aron, & Norman, 2001). A primary way of expanding the self is through close relationships, where others become included in the self-concept. A large body of research on self-expansion theory has examined self-expansion in close...
Preprint
Intergroup competitions such as democratic elections can intensify intergroup polarization and conflict. Partisan attitudes toward the elected leader can also shift following an election, but the biology underlying these attitudinal shifts remains unknown. An important factor could be the hormone testosterone, which is theorized to fluctuate during...
Article
There is emerging evidence that emotional states can influence human decision making under uncertainty. However, it remains unclear if and how emotions influence people' ability to recognize hazards, assess safety risk, and make decisions within an occupational safety context. Literature from construction safety, risk perception, and decision scien...
Article
Although some studies reveal that saliva handling and storage practices may influence salivary testosterone concentrations measured with immunoassays, the effect of these method factors on the validity of testosterone immunoassays remains unknown. The validity of immunoassays can be assessed by comparing hormone concentrations measured with immunoa...
Article
Full-text available
Little is known about the neurobiological pathways through which testosterone promotes aggression or about the people in whom this effect is observed. Using a psychopharmacogenetic approach, we found that testosterone increases aggression in men ( N = 308) with select personality profiles and that these effects are further enhanced among those with...
Preprint
Although some studies reveal that saliva handling and storage practices may influence salivary testosterone concentrations measured with immunoassays, the effect of these methodological factors on the validity of testosterone immunoassays remains unknown. The validity of immunoassays can be assessed by comparing hormone concentrations measured with...
Article
Previous work suggests that testosterone and cortisol interactively predict psychopathy. This effect represents a reversal of the established dual-hormone hypothesis, whereby testosterone is positively correlated with psychopathic traits, but only among individuals with elevated cortisol concentrations. This study aims to replicate the dual-hormone...
Article
Socially anxious people report less closeness to others, but very little research has examined how social anxiety is related to closeness in real-time social interactions. The present study investigated social anxiety, closeness, and cortisol reactivity in zero-acquaintance interactions between 84 same-sex dyads (168 participants). Dyads engaged in...
Conference Paper
Situational awareness concept has been long used in aviation and medical fields to understand and improve an individual's ability to interact and comprehend complex dynamic environments. This study attempts to empirically test situational awareness model proposed by Endsley within construction domain. Specifically, we will test how different levels...
Article
Full-text available
Nostalgia, a sentimental longing for the past, is a self-relevant and social emotion. Nostalgia proneness is associated with alleviation of distress or instability (e.g., neuroticism). Although nostalgia proneness is heritable, the specific molecular contributors to this heritability are unknown. We focused on a polymorphism in the promoter of the...
Article
Recent research on testosterone and risk-taking behavior is beginning to focus on the role of context-dependent changes in testosterone. Extending this research, our study investigated the association between testosterone reactivity to competitive outcomes and risk-taking in the context of a video game based competition. The study also examined whe...
Article
Research suggests that people frequently use music to regulate their emotions. However, little is known about what kinds of music may regulate affective states. To investigate this, we examined how the music preferences of 794 university students were associated with their use of music to regulate emotions. We found that preferences for pop, rap/hi...
Article
Multiple studies show a negative correlation between basal cortisol and testosterone changes in the presence of competition and social-evaluative stressors. These negative associations are proposed to be derived from psychological responses to competition and social-evaluative stress. However, we argue that the association between basal cortisol an...
Article
Although research has investigated the neuroendocrine correlates of romantic relationships, the neuroendocrine correlates of friendship formation are largely unexplored. In two conditions, participants’ salivary testosterone and cortisol were measured before and after a high versus low closeness activity with another same-sex participant. In the hi...
Article
A contribution to a special issue on Hormones and Human Competition. Previous research and theory suggest testosterone is an important hormone for modulating aggression and self-regulation. We propose that self-construal, a culturally-relevant difference in how individuals define the self in relation to others, may be an important moderator of the...
Conference Paper
Every safety meeting and training program is built upon the assumption that construction workers can identify hazards. However, recent research has shown that may not be true because construction workers and managers lack basic hazard recognition skills. Currently, there is relatively little understanding of the factors impacting hazard recognition...
Article
Variation in the facial width-to-height ratio (fWHR) maps onto a number of behavioral and psychological traits among men (e.g., aggression, unethical behavior, negotiation performance). Importantly, observer judgments of many of these traits also correlate strongly with the fWHR, suggesting that it may represent an honest cue to dominance and statu...
Article
Full-text available
Fifteen triads of unacquainted men conversed for ten minutes while stress was measured in real time by pulse rate and thumb blood volume (TBV). Salivary measures of testosterone (T), cortisol (C), and the stress-related enzyme alpha-amylase (AA) were measured at the beginning and end of the session. Fully or partially transitive status hierarchies...
Article
Full-text available
Testosterone (T) concentrations change rapidly in the context of human competition, and these changes in neuroendocrine function may serve to modulate future aggressive behavior. However, an increase in T during competition does not translate into aggressive behavior among all individuals. Here, we examined the extent to which individual difference...
Article
Full-text available
Emerging lines of research suggest that both testosterone and maladaptive reward processing can modulate behavioral dysregulation. Yet, to date, no integrative account has been provided that systematically explains neuroendocrine function, dysregulation of reward, and behavioral dysregulation in a unified perspective. This is particularly important...
Article
Previous work indicates that facial width to height ratio predicts aggressive behavior, particularly when social status is low. The current research extends these findings with experimental evidence that status can moderate the relationship between facial structure and risk-taking. Male participants (N = 165) completed a measure of status, had thei...
Article
Full-text available
Previous research suggests that facial-width-to-height ratio (FWHR) predicts aggression, unethical behavior, and non-reciprocity of trust. One limitation of this research is that all samples originate from western countries. To overcome this limitation, the present study investigates the relationship between FWHR and performance among association f...
Article
Full-text available
Previous work shows that high self-disclosure interactions between couples can increase feelings of closeness within couples. We investigated whether couple friendships created in the lab through high self-disclosure and closeness-building activities would boost feelings of passionate love. In Study 1, couples randomly assigned to a high (vs. low)...
Article
Persistence is an important predictor of future successes. The present research addresses the relationship between testosterone and persistence in men. One hundred eighteen men were randomly assigned to win or lose a competitive number tracing task against a confederate or complete the task alone in a non-competitive control condition. Saliva sampl...
Article
Full-text available
We tested the hypotheses that the Fast Track intervention program for high-risk children would reduce adult aggressive behavior and that this effect would be mediated by decreased testosterone responses to social provocation. Participants were a subsample of males from the full trial sample, who during kindergarten had been randomly assigned to the...
Article
Full-text available
OBJECTIVE. The purpose of this study was to examine the feasibility and efficacy of the Family Caregiver Training Program for assisting with the basic activities of daily living of people with dementia. METHOD. A one-group pretest–posttest research design with a 3-mo follow-up was used to examine the efficacy of a manualized education program for c...
Article
Full-text available
Building personal relationships with outgroup members is an important catalyst of positive intergroup attitudes. In a 2 x 2 experimental design, Caucasian and African American individuals and couples were randomly assigned to interact in either cross-race or same-race individual dyads and couple pairs. Participants completed pretest measures of rac...
Article
Adopting a powerful posture leads individuals to feel more confident and dominant. Social exclusion can strongly impact individuals' mood and basic social needs. The current research combines these bodies of research, investigating the effects of dominant and submissive poses on responses to social exclusion and inclusion. In two experiments, parti...

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