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Using the Threat Probability Task to Assess Anxiety and Fear During Uncertain and Certain Threat
11:18

Using the Threat Probability Task to Assess Anxiety and Fear During Uncertain and Certain Threat

Published on: September 12, 2014

Threat and anxiety affect visual contrast perception.

G Laretzaki1, S Plainis, S Argyropoulos

  • 1Department of Psychiatry and Behavioral Sciences, University of Crete, Heraklion, Greece.

Journal of Psychopharmacology (Oxford, England)
|November 18, 2008
PubMed
Summary

Threat perception accelerates visual processing, particularly contrast detection, in individuals with lower anxiety. This challenges previous assumptions in visual search studies regarding threat effects.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Threat cues activate the visual cortex and are detected faster than neutral cues.
  • The specific functional visual processes involved in threat detection remain unclear.

Purpose of the Study:

  • To investigate the functional visual processes underlying faster threat detection.
  • To examine how trait anxiety influences the perception of threat cues.

Main Methods:

  • Pattern visual evoked potentials (VEPs) were recorded in high and low trait anxiety groups.
  • VEPs were measured under baseline and verbal threat conditions with varying stimulus contrasts.

Main Results:

  • Threat stimuli reduced the latency of the early P100 wave in low-anxiety individuals, but not high-anxiety individuals.
  • This latency reduction was more pronounced with increasing stimulus contrasts.
  • P100 latency showed a relationship with trait anxiety, resembling the Yerkes-Dodson curve.

Conclusions:

  • Threat significantly impacts perceptual processes, specifically accelerating contrast perception.
  • Findings suggest a reappraisal of visual search studies to incorporate accelerated contrast perception in threat detection.
  • Trait anxiety modulates the effect of threat on early visual processing stages.