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Related Concept Videos

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Related Experiment Video

Updated: Oct 13, 2025

Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum
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Eye-hand coordination: memory-guided grasping during obstacle avoidance.

Hana H Abbas1, Ryan W Langridge2, Jonathan J Marotta2

  • 1Perception and Action Lab, Department of Psychology, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada. abbash35@myumanitoba.ca.

Experimental Brain Research
|November 17, 2021
PubMed
Summary
This summary is machine-generated.

Memory-guided grasping involves reaching for objects without direct sight, relying on internal representations. Obstacle avoidance strategies differ based on visual feedback availability, with long-delay memory guidance showing less exaggerated avoidance.

Keywords:
Delayed reachingEye–hand coordinationGraspingObstacle avoidance

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Area of Science:

  • Cognitive neuroscience
  • Motor control
  • Visual perception

Background:

  • Memory-guided actions utilize stored perceptual representations, likely involving the ventral visual stream.
  • Obstacle avoidance during grasping is crucial but less studied in memory-guided actions.
  • Increased obstacle salience may trigger exaggerated avoidance behaviors.

Purpose of the Study:

  • To investigate obstacle avoidance strategies during memory-guided reaching and grasping.
  • To compare avoidance behaviors under visually-guided versus memory-guided conditions.
  • To determine if visual feedback absence influences obstacle avoidance magnitude.

Main Methods:

  • Subjects reached to grasp a 3D target object between flanker obstacles.
  • Conditions included visually-guided (closed-loop, open-loop) and memory-guided (short/long delay) grasping.
  • Obstacle positions and widths were manipulated while maintaining constant target access.

Main Results:

  • Grasping and gaze were biased away from obstacles, consistent with general obstacle avoidance literature.
  • Distinct avoidance strategies emerged depending on visual feedback availability.
  • Long-delay memory-guided grasping showed less modification of final grasp/fixation positions, indicating moderate avoidance.

Conclusions:

  • Visual feedback significantly modulates obstacle avoidance during reaching and grasping.
  • Memory-guided actions, especially with long delays, employ a less exaggerated obstacle avoidance strategy than expected.
  • The findings highlight the dynamic interplay between memory, vision, and motor control in action planning.