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Related Experiment Videos

Attention and perceptual learning modulate contextual influences on visual perception

M Ito1, G Westheimer, C D Gilbert

  • 1The Rockefeller University, New York, New York 10021, USA.

Neuron
|July 9, 1998
PubMed
Summary

Visual attention impacts brightness discrimination. Focused attention improves performance but reduces contextual enhancement, while distributed attention shows the opposite, with effects trainable over time.

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Area of Science:

  • Visual perception
  • Neuroscience
  • Psychophysics

Background:

  • Understanding how attention modulates visual processing is crucial for comprehending perception.
  • Lateral interactions play a significant role in visual scene analysis and brightness perception.

Purpose of the Study:

  • To investigate the influence of focused versus distributed attention on brightness discrimination.
  • To examine how collinear facilitation is affected by different attentional states.
  • To determine the impact of training on attentional effects in visual perception.

Main Methods:

  • Brightness discrimination thresholds were measured in humans and monkeys.
  • Experiments involved peripheral line judgments under focused (cued) and distributed (uncued) attention.

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  • Collinear facilitation was assessed by introducing flanking lines.

    • Main Results:

    • Discrimination accuracy was superior under focused attention compared to distributed attention.
    • Collinear facilitation was significantly stronger with distributed attention (4x) than focused attention.
    • Training improved thresholds and reduced facilitation under distributed attention, but not focused attention.

    Conclusions:

    • Directing attention to a specific visual location diminishes the benefits derived from contextual interactions.
    • Attentional modulation of visual processing, including contextual effects, is plastic and can be modified through training.
    • These findings highlight distinct mechanisms underlying focused and distributed attention in visual perception.