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Threat shapes visual context sensitivity selectively through low-spatial-frequency channels.

Xuhua Hu1, Bengang Feng1, Lihong Chen1

  • 1Research Center of Brain and Cognitive Neuroscience, Liaoning Normal University, Dalian, PR China; Key Laboratory of Brain and Cognitive Neuroscience, Liaoning Province, Dalian, PR China.

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Summary

Threatening animal images impact visual perception, reducing illusion effects at low spatial frequencies. Fearful faces did not show this effect, but brain stimulation revealed specific spatial frequency processing in the temporo-parietal junction (TPJ).

Keywords:
Ebbinghaus illusionSpatial frequencyTMSTemporo-parietal junctionThreat

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Threat perception influences human cognitive processing, including visual perception.
  • The role of spatial frequency in threat-related modulation of visual perception remains largely unexplored.

Purpose of the Study:

  • To investigate how spatial frequency modulates the effect of threat primes on visual size perception.
  • To examine the involvement of the temporo-parietal junction (TPJ) in these effects.

Main Methods:

  • Utilized low- and high-pass filtered threatening animal and fearful face images as primes.
  • Measured the impact of primes on the Ebbinghaus illusion magnitude.
  • Applied inhibitory transcranial magnetic stimulation (TMS) to the left and right TPJ.

Main Results:

  • Threatening animal primes decreased illusion magnitude in the low-spatial-frequency range but not high-spatial-frequency.
  • Fearful face primes had similar effects across spatial frequencies.
  • TMS to the left TPJ replicated the low-spatial-frequency effect for fearful faces, while right TPJ stimulation showed the opposite pattern.

Conclusions:

  • Threat influences visual perception in a spatial frequency-dependent manner.
  • These effects may involve magnocellular pathways connecting fear-processing systems to early visual cortex.
  • The TPJ plays a role in modulating threat perception across different spatial frequencies.