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Related Experiment Video

Updated: Mar 28, 2026

Measuring Attentional Biases for Threat in Children and Adults
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Amygdala lesions in rhesus macaques decrease attention to threat.

Olga Dal Monte1, Vincent D Costa1, Pamela L Noble1

  • 1Laboratory of Neuropsychology, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland 20892-4415, USA.

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Summary
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The amygdala is crucial for threat detection and directing attention to facial features like the mouth and eyes. Amygdala lesions in monkeys reduced their ability to focus on threat cues and explore eye regions.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Primate Behavior

Background:

  • The amygdala is implicated in threat detection and visual attention, particularly towards eyes.
  • Previous research lacks systematic investigation into the amygdala's specific role in attentional capture by facial features.

Purpose of the Study:

  • To investigate the effect of amygdala lesions on attentional capture by specific facial features in rhesus monkeys.
  • To analyze gaze patterns and pupil dilation during free viewing following amygdala damage.

Main Methods:

  • Surgical induction of amygdala lesions in rhesus monkeys.
  • Free viewing tasks to observe attentional capture by facial stimuli.
  • Eye-tracking and pupil dilation measurements during visual exploration.

Main Results:

  • Monkeys with amygdala lesions exhibited reduced attentional capture by threat stimuli, specifically the mouth.
  • Lesioned monkeys showed decreased exploration of the eye region during free viewing.
  • Pupil dilation patterns were altered, suggesting changes in arousal and attention.

Conclusions:

  • The amygdala plays a significant role in detecting threat signals from facial features like the mouth.
  • The amygdala is essential for directing attention to the eye region of faces during naturalistic viewing.
  • These findings underscore the amygdala's importance in social cognition and threat perception.