Summary: Social exclusion threatens an individual’s status and can trigger a range of behavioral responses. New research shows that changes in testosterone after exclusion interact with a person’s tendency to feel shame to predict aggressive behavior.
This study found that men low in shame proneness became more aggressive when their testosterone rose after being excluded, and less aggressive when their testosterone fell. In contrast, men high in shame proneness showed little change in aggression regardless of testosterone shifts. These results highlight how hormonal reactions and personality traits jointly shape responses to social rejection.
Key Facts:
- Social exclusion can prompt rapid testosterone reactivity, a hormonal signal linked to dominance and status-seeking behavior.
- Among men low in shame proneness, an increase in testosterone following exclusion predicted higher aggressive behavior, while a decrease predicted lower aggression.
- Men high in shame proneness showed no meaningful change in aggression after exclusion, regardless of testosterone reactivity.
Why this matters: Experiences of exclusion—from childhood peer rejection to adult social isolation—are emotionally painful and can carry psychological and physical costs. Humans evolved to rely on social bonds for protection, resources, and reproductive opportunities, so being excluded can be perceived as a threat to status or survival. Biology, including quick shifts in hormones like testosterone, participates in how we interpret and respond to these threats.
Background: social exclusion and status signals
When people are treated as winners or losers in social hierarchies, their bodies often signal those outcomes. Testosterone commonly rises in competitive or victorious contexts and can promote behaviors that maintain status, while declines in testosterone are associated with withdrawal or submissive behavior. However, the hormone’s behavioral effects are not uniform—context and personality matter. In social settings, exclusion can act like a perceived loss, and researchers are interested in whether accompanying hormonal changes predict aggressive or conciliatory reactions.
Shame proneness as a moderating personality trait
Shame proneness describes how readily someone experiences shame and whether they respond with inward-focused shame (self-blame and withdrawal) or outward-directed responses (anger and aggression). People high in shame proneness often interpret social threats as reflections of personal deficiency and may respond by withdrawing to protect self-concept. Others may externalize shame and become hostile. Because shame shapes how people process social threats, it is a logical candidate to moderate the influence of testosterone on behavior after exclusion.
The study: design and measures
Researchers tested 167 men in a controlled experiment. Participants were randomly assigned to experience social inclusion or exclusion using a standardized virtual ball-tossing task (Cyberball). Saliva samples measured testosterone before and after the task to capture acute hormonal reactivity. After the game, aggressive behavior was assessed using the Point Subtraction Aggression Paradigm (PSAP). The analysis tested whether testosterone changes and individual differences in shame proneness together predicted post-exclusion aggression.
Key findings
The study detected an interaction between Cyberball condition and testosterone reactivity, and a further three-way interaction including shame proneness. Specifically, among men low in shame proneness, those who showed a testosterone increase after exclusion displayed elevated aggression, while those whose testosterone decreased showed reduced aggression. Among men high in shame proneness, aggression did not vary meaningfully with testosterone changes; exclusion did not reliably predict aggressive behavior regardless of hormonal reactivity.
Interpretation
These results suggest that testosterone’s role in post-exclusion aggression depends on individual disposition. For less shame-prone individuals, hormonal signals may translate more directly into status-defending behaviors. For those prone to shame, internal emotional processes may override or obscure hormonal influences, leading to a more consistent pattern of non-aggressive responses after social threat.
Implications
Understanding how hormones and personality interact improves our ability to predict who is likely to respond aggressively after social exclusion. These insights can inform targeted interventions—social, psychological, or educational—that address both biological sensitivity and emotional coping styles. Recognizing this complexity helps move beyond one-size-fits-all assumptions about reactions to rejection.
About this research and reporting
Author: Neuroscience News Communications
Source: Neuroscience News
Original research: “Excluded and ashamed: Shame proneness interacts with social exclusion and testosterone reactivity to predict behavioral aggression” by Lindsay Bochon et al., published in Psychoneuroendocrinology (open access).
Abstract summary: Exclusion threatens status and prompts rapid testosterone changes that may drive defensive or aggressive behavior. This study of 167 men used Cyberball and the PSAP to measure aggression and collected saliva to assess testosterone reactivity. Results showed that for men low in shame proneness, testosterone increases after exclusion predicted greater aggression while decreases predicted less aggression. For men high in shame proneness, aggression was not significantly affected by testosterone changes. These findings highlight how context and disposition jointly shape the neuroendocrinology of social behavior.