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Related Experiment Videos

When does the visual system use viewpoint-invariant representations during recognition?

Kevin D Wilson1, Martha J Farah

  • 1Department of Psychology, University of Pennsylvania, 3815 Walnut Street, Pennsylvania, PA 19104, USA. kwilson@duke.edu

Brain Research. Cognitive Brain Research
|April 23, 2003
PubMed
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Object recognition uses viewpoint-invariant representations when features align to one dimension. However, voluntary control, not just stimulus features, also influences these representations in visual recognition.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Computer Vision

Background:

  • Object recognition models often propose view-specific representations.
  • Viewpoint-invariant representations are hypothesized for objects defined by single-dimensional features.

Purpose of the Study:

  • To test the hypothesis that object recognition uses viewpoint-invariant representations based solely on stimulus features.
  • To investigate the role of voluntary control in activating viewpoint-invariant representations.

Main Methods:

  • Three naming experiments using novel 2D line drawings.
  • Objects were presented upright and rotated in the viewplane.
  • Analysis focused on stimulus features and participant control.

Main Results:

Related Experiment Videos

  • Experiments 1 & 2 supported the model: feature dimensionality predicted representation type.
  • Experiment 3 showed voluntary control also influences representation use.
  • Viewpoint-invariant representations are not automatically triggered by stimulus features alone.

Conclusions:

  • Visual recognition involves both bottom-up stimulus features and top-down control.
  • Voluntary control plays a significant role in determining when viewpoint-invariant representations are used.
  • This challenges purely stimulus-driven accounts of object recognition.