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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Published on: January 23, 2017

Rapid changes in visual-spatial attention distort object shape.

Francesca C Fortenbaugh1, William Prinzmetal, Lynn C Robertson

  • 1Veterans Administration, Martinez, CA, USA.

Psychonomic Bulletin & Review
|February 18, 2011
PubMed
Summary
This summary is machine-generated.

Visual cues can alter shape perception. This study shows that attention shifts caused by rapid cue onsets distort perceived oval shapes, repelling them from the cue location.

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Attention studies

Background:

  • Rapid cue onsets are known to shift visual attention and affect object location perception.
  • The impact of such attention shifts on the perceived shape of objects remains less understood.

Purpose of the Study:

  • To investigate whether shifts in attention caused by rapid visual cues systematically distort the perceived shape of objects.
  • To determine if visual cues can alter the perceived aspect ratio of oval contours.

Main Methods:

  • Three experiments were conducted using oval contours with varying width and height.
  • Brief white dot cues were presented horizontally or vertically, inside or outside the ovals.
  • Participants judged whether the ovals were taller than wide.

Main Results:

  • Visual cues altered the perceived shape of ovals, causing them to appear repelled from the cue location.
  • This shape distortion effect was contingent on the cue preceding the oval, allowing time for involuntary attention capture.
  • Explanations based on figural aftereffects were empirically excluded.

Conclusions:

  • Rapidly presented visual cues can induce systematic distortions in perceived object shape, not just location.
  • Involuntary attention shifts play a crucial role in mediating cue-induced shape distortions.
  • The findings contribute to understanding the complex interplay between attention and visual form perception.