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Related Concept Videos

Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Adaptive changes to saccade amplitude and target localization do not require pre-saccadic target visibility.

Frauke Heins1,2, Jana Masselink3,4, Joshua-Nikodemus Scherer3

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Saccadic adaptation, crucial for eye movement accuracy, can be driven by post-saccadic visual information alone. This suggests the brain can update motor commands based on visual feedback received after an eye movement is completed.

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Area of Science:

  • Neuroscience
  • Oculomotor Research
  • Motor Learning

Background:

  • Saccadic adaptation refines eye movement accuracy.
  • Traditionally linked to prediction error, recent theories propose postdictive motor error drives adaptation.
  • This study investigates adaptation using only post-saccadic visual information.

Purpose of the Study:

  • To determine if post-saccadic visual information alone can drive saccadic adaptation.
  • To explore the role of postdictive motor error in oculomotor behavior.
  • To investigate the brain's ability to update saccade commands based on visual feedback received after movement.

Main Methods:

  • Participants performed saccades to an initially invisible target.
  • Eye movements and localization judgments were recorded.
  • Adaptation was tested by shifting the target position after initial trials, using post-saccadic visual feedback.

Main Results:

  • Saccade amplitude adjusted to the changing target position.
  • Pre- and post-saccadic localization judgments adapted to the target shifts.
  • Post-saccadic visual information was sufficient to induce adaptive changes in saccade accuracy and localization.

Conclusions:

  • Post-saccadic visual information is sufficient to drive saccadic adaptation.
  • This supports the role of postdictive motor error in updating oculomotor commands.
  • The findings suggest continuous updating of target location estimates based on post-saccadic feedback.