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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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Related Experiment Video

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Visualizing Visual Adaptation
04:43

Visualizing Visual Adaptation

Published on: April 24, 2017

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
Summary

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.

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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  • Three attentional conditions (focused, distributed, withdrawn) were tested.

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.