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Reference frames in saccadic targeting

K S Karn1, P Møller, M M Hayhoe

  • 1Center for Visual Science and Department of Brain and Cognitive Sciences, University of Rochester, NY 14627-0270, USA.

Experimental Brain Research
|June 1, 1997
PubMed
Summary
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Memory-guided saccades utilize a head-centered reference frame, not solely a retina-centered one, to account for intervening eye movements. This research clarifies egocentric frames in saccadic targeting without external cues.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Background:

  • Understanding the egocentric reference frame is crucial for directing eye movements to remembered targets.
  • Previous models debated whether memory-guided saccades use retina-centered or head-centered representations.

Purpose of the Study:

  • To determine the egocentric reference frame used for memory-guided saccades when exocentric cues are absent.
  • To investigate the role of head-centered versus retina-centered frames in saccadic targeting accuracy.

Main Methods:

  • Human observers performed memory-guided saccades to remembered target locations.
  • A variable number of intervening saccades were introduced between target presentation and saccade execution.
  • A visual landmark was present in half the trials to enable exocentric encoding.

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Main Results:

  • Variable error in saccades increased slightly with more intervening eye movements.
  • A visual landmark improved targeting precision but did not eliminate error accumulation.
  • Results suggest a reliance on eye position relative to the head, not just retinal updating.

Conclusions:

  • Memory-guided saccades likely employ a head-centered reference frame that incorporates eye position information.
  • The findings provide an upper bound for the eye position signal's standard deviation in the saccadic system (1.4 degrees).