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Hemifield effects in multiple identity tracking.

Charlotte Hudson1, Piers D L Howe, Daniel R Little

  • 1Melbourne School of Psychological Sciences, The University of Melbourne, Parkville, Victoria, Australia.

Plos One
|September 7, 2012
PubMed
Summary
This summary is machine-generated.

Tracking moving objects is easier across both visual fields, even when remembering their identities. This study shows a bilateral advantage persists, though reduced, when identity recall is required.

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Area of Science:

  • Cognitive psychology
  • Visual perception
  • Human attention

Background:

  • Previous research suggested independent visual hemifield processing for object tracking.
  • A bilateral advantage was observed when tracking objects spread across visual fields versus confined to one.
  • Identity recall was not required in prior studies.

Purpose of the Study:

  • To test the prediction that a bilateral advantage in object tracking disappears when identity recall is required.
  • To investigate the interaction between multiple object tracking and multiple identity tracking.
  • To determine if visual hemifields process object tracking independently when identity memory is involved.

Main Methods:

  • Participants tracked multiple objects presented across visual hemifields.
  • Object tracking accuracy was measured with and without the requirement to remember object identities.
  • Performance was compared between conditions where targets were spread across hemifields versus confined to one.

Main Results:

  • A bilateral advantage for object tracking was still observed when identity recall was required, though it was reduced.
  • Tracking performance was not completely independent between the left and right visual hemifields, even with identity recall.
  • The bilateral advantage was stronger when participants were not required to remember object identities.

Conclusions:

  • The bilateral advantage in multiple object tracking persists even when identity recall is necessary.
  • Visual hemifields do not process object tracking entirely independently when identity memory is a factor.
  • A combined model of multiple object tracking and multiple identity tracking can account for the observed findings.