Saccadic facilitation by modulation of microsaccades in natural backgrounds

Atten Percept Psychophys. 2011 May;73(4):1029-33. doi: 10.3758/s13414-011-0107-9.

Abstract

Saccades move objects of interest into the center of the visual field for high-acuity visual analysis. White, Stritzke, and Gegenfurtner (Current Biology, 18, 124-128, 2008) have shown that saccadic latencies in the context of a structured background are much shorter than those with an unstructured background at equal levels of visibility. This effect has been explained by possible preactivation of the saccadic circuitry whenever a structured background acts as a mask for potential saccade targets. Here, we show that background textures modulate rates of microsaccades during visual fixation. First, after a display change, structured backgrounds induce a stronger decrease of microsaccade rates than do uniform backgrounds. Second, we demonstrate that the occurrence of a microsaccade in a critical time window can delay a subsequent saccadic response. Taken together, our findings suggest that microsaccades contribute to the saccadic facilitation effect, due to a modulation of microsaccade rates by properties of the background.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Attention*
  • Female
  • Field Dependence-Independence*
  • Fixation, Ocular
  • Humans
  • Male
  • Orientation
  • Pattern Recognition, Visual*
  • Perceptual Masking
  • Psychomotor Performance
  • Reaction Time*
  • Saccades*
  • Space Perception
  • Visual Acuity
  • Visual Fields*
  • Young Adult