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Similarity between concurrent visual discriminations: dimensions and objects

J Duncan1

  • 1MRC Applied Psychology Unit, Cambridge, England.

Perception & Psychophysics
|October 1, 1993
PubMed
Summary
This summary is machine-generated.

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Divided attention impairs visual accuracy. Contrary to predictions, performance depends on the number of objects, not discrimination similarity, suggesting attention coordinates multiple visual subsystems.

Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Neuroscience

Background:

  • Divided attention often leads to reduced accuracy in visual tasks.
  • A prior hypothesis suggested that the similarity of concurrent visual discriminations influences this accuracy reduction.

Purpose of the Study:

  • To test the hypothesis that the similarity of visual discriminations affects performance under divided attention.
  • To investigate the role of visual dimension similarity in concurrent task performance.

Main Methods:

  • Two experiments were conducted using visual discriminations of shape, size, orientation, and spatial frequency.
  • Participants performed concurrent discriminations under divided attention, varying the number of objects and the similarity of discrimination dimensions.

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Main Results:

  • Performance was solely dependent on the number of relevant objects being attended to.
  • The similarity or number of required visual discriminations did not significantly impact performance.
  • Results contradict the hypothesis that discrimination similarity modulates divided attention effects.

Conclusions:

  • Selective attention to an object involves a coordinated state.
  • This state makes outputs from multiple visual subsystems available for behavioral control.
  • Attention mechanisms appear object-based rather than dimension-specific regarding interference.