Saccadic inhibition underlies the remote distractor effect

Exp Brain Res. 2008 Oct;191(1):117-22. doi: 10.1007/s00221-008-1558-7. Epub 2008 Sep 11.

Abstract

The remote distractor effect is a robust finding whereby a saccade to a lateralised visual target is delayed by the simultaneous, or near simultaneous, onset of a distractor in the opposite hemifield. Saccadic inhibition is a more recently discovered phenomenon whereby a transient change to the scene during a visual task induces a depression in saccadic frequency beginning within 70 ms, and maximal around 90-100 ms. We assessed whether saccadic inhibition is responsible for the increase in saccadic latency induced by remote distractors. Participants performed a simple saccadic task in which the delay between target and distractor was varied between 0, 25, 50, 100 and 150 ms. Examination of the distributions of saccadic latencies showed that each distractor produced a discrete dip in saccadic frequency, time-locked to distractor onset, conforming closely to the character of saccadic inhibition. We conclude that saccadic inhibition underlies the remote distractor effect.

MeSH terms

  • Adolescent
  • Attention / physiology*
  • Humans
  • Neural Inhibition / physiology*
  • Photic Stimulation
  • Reaction Time / physiology
  • Saccades / physiology*
  • Visual Fields / physiology*
  • Visual Perception / physiology
  • Young Adult