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Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function
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Saccadic eye movements in the dark while performing an automatized sequential high-speed sensorimotor task.

Rebecca M Foerster1, Elena Carbone, Hendrik Koesling

  • 1Department of Psychology, Bielefeld University, Bielefeld, Germany. rebecca.foerster@uni-bielefeld.de

Journal of Vision
|February 11, 2012
PubMed
Summary

Even in complete darkness, automatized tasks like speed stacking involve systematic eye movements. This suggests a long-term memory-based control mode guides attention and saccades during well-learned sensorimotor tasks.

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Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Ophthalmology

Background:

  • Saccades guide hand movements in object-related tasks.
  • Automatized tasks can be performed in the dark, but the role of saccades is unclear.
  • A long-term memory (LTM)-based control mode was previously proposed for dark sensorimotor tasks.

Purpose of the Study:

  • To investigate saccade execution during an automatized sensorimotor task in the dark.
  • To test the hypothesis of an LTM-based attention selection mode.

Main Methods:

  • Participants performed a speed-stacking task in light and dark conditions.
  • Eye movements were recorded using eye-tracking technology.
  • Analysis focused on saccadic scan paths, fixation counts, and durations.

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Main Results:

  • Systematic eye movements were observed in the dark.
  • Scan paths and fixation counts were similar in light and dark.
  • Fixation durations were longer, and rates were lower in the dark.
  • Eyes reached target locations ahead of hands, even without vision.

Conclusions:

  • Results support the LTM-based control mode for automatized sensorimotor tasks.
  • Attention selection in the dark relies on stored motor memories.
  • Eye movements play a crucial role in guiding actions even when visual feedback is absent.