How you perceive threat determines your behavior

Fernandes, Orlando; Portugal, Liana Catarina Lima; Alves, Rita C. S.; Campagnoli, Rafaela R.; Mocaiber, Izabela; David, Isabel A.; Erthal, Fátima Smith; Volchan, Eliane; Oliveira, Letícia; Pereira, Mirtes Garcia · 2013 · OpenAlex-citations

DOI: 10.3389/fnhum.2013.00632

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Summary

This study investigates how the perception of threat imminence influences behavioral responses, specifically reaction times (RT), during a cognitive task. While emotional stimuli typically slow RTs due to attentional capture, the authors hypothesized that manipulating threat direction could trigger distinct defensive responses—overt action versus immobility—thereby altering this modulation. The research aimed to determine if RT changes represent a summation of attentional and motivational effects, and whether prior exposure to violent crime amplifies these responses. The experimental design involved 90 participants performing a bar orientation discrimination task while viewing central distractor images. These images were categorized into three types: neutral stimuli, threat stimuli directed toward the observer (e.g., a gun pointed at the viewer), and threat stimuli directed away from the observer. The study utilized a within-subjects design with two blocks, each containing 15 neutral and 15 threat trials. Stimuli were carefully matched for complexity, valence, and arousal. Additionally, a subset of participants completed a Trauma History Questionnaire to assess exposure to violent crimes, allowing for an analysis of trauma load effects. Reaction times were measured, and an emotional modulation index was calculated by subtracting neutral trial RTs from threat trial RTs. The results demonstrated that threat direction significantly modulated behavior. Threat stimuli directed toward the observer produced a negative modulation index (−24 ms), indicating faster RTs compared to neutral stimuli. This acceleration was attributed to increased motor preparation driven by a strong activation of the defense response cascade. Conversely, threat stimuli directed away from the observer produced a positive modulation index (10 ms), resulting in slower RTs than neutral trials. This delay was interpreted as an immobility or freezing response, where the defense cascade was activated less intensively. Furthermore, participants with a high history of violent crime exposure showed a significantly stronger acceleration of RTs when viewing threats directed toward them, compared to those with low trauma exposure. These findings support the conclusion that emotional modulation of behavior is not solely attentional but also motivational, reflecting specific action tendencies. The study provides evidence that emotions function as adaptive mechanisms preparing individuals for appropriate defensive actions based on perceived threat imminence. The distinction between accelerated responses to imminent threats and slowed responses to distant threats highlights the role of the defensive response cascade in shaping cognitive performance. Additionally, the heightened sensitivity in individuals with violent crime histories suggests that personal trauma history influences the intensity of defensive behavioral responses to threat cues.

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• hazard perception