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How do attention and adaptation affect contrast sensitivity?

Franco Pestilli1, Gerardo Viera, Marisa Carrasco

  • 1Department of Psychology, New York University, New York, NY, USA. franco@nyu.edu

Journal of Vision
|August 10, 2007
PubMed
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Attention and adaptation independently optimize visual performance by altering contrast sensitivity. Attention enhances stimulus salience, while adaptation reduces it, with attention able to overcome adaptation effects.

Area of Science:

  • Visual neuroscience
  • Perceptual psychology

Background:

  • Attention and adaptation are key mechanisms for optimizing visual performance.
  • Attention enhances sensitivity to attended stimuli and reduces it for unattended ones.
  • Adaptation enhances sensitivity to changing stimuli and reduces it for static ones.

Purpose of the Study:

  • To investigate the interaction between adaptation state and attentional effects on contrast sensitivity.
  • To determine if adaptation modulates the magnitude of attention's effect on visual performance.

Main Methods:

  • Contrast sensitivity was measured using an orientation-discrimination task.
  • Two adaptation conditions (0% and 100% contrast) were employed.
  • Three attentional conditions (focused, distributed, withdrawn) were tested.

Related Experiment Videos

Main Results:

  • Attention and adaptation influence the contrast psychometric function oppositely.
  • Attention increases stimulus salience, whereas adaptation decreases it.
  • The adaptation state did not modulate the magnitude of the attentional effect.

Conclusions:

  • Attention and adaptation act separately on contrast sensitivity.
  • Attention appears to act on the normalized signal after adaptation occurs.
  • Attention can overcome adaptation to restore contrast sensitivity.