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Related Experiment Videos

Attention-generated apparent motion

Z L Lu1, G Sperling

  • 1Department of Cognitive Sciences, University of California, Irvine 92717, USA.

Nature
|September 21, 1995
PubMed
Summary
This summary is machine-generated.

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A novel third-order motion mechanism is proposed, utilizing selective attention to perceive motion invisible to first- and second-order systems. This mechanism computes motion directly from a salience map of significant features.

Area of Science:

  • Visual perception
  • Neuroscience
  • Computational vision

Background:

  • Motion perception is categorized into first-order (luminance-defined) and second-order (non-luminance-defined) mechanisms, primarily monocular.
  • Unusual apparent motion phenomena suggest a potential third-order motion mechanism, but its computational basis remains unclear.

Purpose of the Study:

  • To investigate the existence and computational principles of a third-order motion perception mechanism.
  • To demonstrate a novel stimulus that selectively engages this proposed third-order mechanism.

Main Methods:

  • Introduction of 'alternating feature' stimuli designed to be invisible to first- and second-order motion detection.
  • Experimental manipulation requiring selective attention to specific features within the stimuli.

Related Experiment Videos

  • Observation of apparent motion direction contingent on the attended feature.

    • Main Results:

    • Apparent motion was perceived only when observers selectively attended to one of the embedded features.
    • The perceived motion was undetectable by established first- or second-order motion mechanisms.
    • The direction of apparent motion was directly dependent on which feature the observer attended.

    Conclusions:

    • Findings support the existence of a third-order motion mechanism.
    • This mechanism appears to operate by registering feature locations on a salience map.
    • Motion is computed directly from this salience map, modulated by selective attention.