Fear makes you stronger: Responding to feared animal targets in visual search

Flykt, Anders; Lindeberg, Sofie; Derakshan, Nazanin · 2012 · Crossref

DOI: 10.3758/s13414-012-0336-6

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Summary

This study investigates whether fear influences the physical strength of manual responses during visual search tasks, challenging the prevailing assumption that emotional stimuli primarily affect response speed (reaction time) rather than force. The authors address the gap in literature regarding how focused attention on a feared target translates into behavioral motor preparation. Specifically, they test the hypothesis that detecting a feared animal target elicits stronger manual responses compared to when the same animal serves as a distractor, and whether this effect is driven by the specific fear relevance of the stimulus. The research comprised two experiments. Experiment 1 involved 12 participants selected for high fear of either snakes or spiders, but not both. Participants performed a visual search task using 3 × 4 arrays containing images of snakes, spiders, or cats. They were instructed to press a force-measuring button as quickly as possible if a deviant animal was present. Response force was measured in newtons, and heart rate (HR) was recorded to assess physiological arousal. Experiment 2 utilized a normative sample of 30 unselected participants to determine if the observed force differences were specific to fearful individuals or generalizable to the broader population. This experiment also collected reaction time data using a standard keyboard to compare speed and force patterns. In Experiment 1, results showed that animal-fearful individuals exerted significantly greater force when the feared animal was the target (27.80 N) compared to when it was a distractor (23.04 N). This effect was most pronounced when the feared target was contrasted with neutral cat distractors. Heart rate data corroborated these findings, showing distinct deceleration and acceleration patterns depending on whether the feared animal was the target or distractor, indicating that focused attention on the threat modulates physiological responses. In Experiment 2, the normative sample did not show increased force for fear-relevant targets (snakes/spiders) among neutral distractors; instead, they exerted more force when a cat was the target among snake or spider distractors. Reaction times in Experiment 2 were faster for fear-relevant targets among neutral distractors, but force did not follow this pattern. The findings conclude that fear specifically increases the strength of manual responses when attention is focused on a feared target, supporting the theory that fear involves motor preparation and increased muscle tension. The study demonstrates that while reaction time advantages for fear-relevant stimuli are robust across populations, the increase in response force is specific to individuals with high fear levels. This suggests that the behavioral manifestation of fear includes not just faster detection but also more forceful action initiation, highlighting the role of motor preparation in emotional responding.

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• visual search