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Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function
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Saccades and reaches, behaving differently.

Bonnie M Lawrence1, Andrew L Gardella

  • 1Department of Psychology, Case Western Reserve University, Cleveland, OH 44106, USA. bonnie.lawrence@case.edu

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The anti-Hick's effect, where saccade (eye movement) latencies decrease with more choices, persists even when reaches are performed simultaneously. This suggests the effect is specific to the saccade system, independent of reach system interactions.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human motor control

Background:

  • Previous research demonstrated an "anti-Hick's" effect in saccade generation, where latencies decrease as response alternatives increase.
  • Conversely, reach latencies typically increase with more response alternatives.
  • Interactions between saccade and reach systems are known, prompting investigation into their combined response patterns.

Purpose of the Study:

  • To investigate if the anti-Hick's effect in saccade latencies is altered when saccades and reaches are executed concurrently.
  • To determine the localization of the anti-Hick's effect within the motor control system.

Main Methods:

  • A visually guided saccade and reach task was employed.
  • Participants executed both saccades and reaches simultaneously under varying numbers of response alternatives.
  • Saccade and reach latencies were measured and analyzed.

Main Results:

  • The anti-Hick's effect persisted, with saccade latencies decreasing as response alternatives increased, even during concomitant reach execution.
  • Reach latencies followed the expected pattern of increasing with response alternatives.
  • The distinct patterns suggest independent processing within the saccade and reach systems.

Conclusions:

  • The anti-Hick's effect is localized within the saccade system.
  • This effect appears to be independent of reach system processing, occurring at a neural level where saccade and reach signals do not interact.