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Design and Use of an Apparatus for Presenting Graspable Objects in 3D Workspace
09:11

Design and Use of an Apparatus for Presenting Graspable Objects in 3D Workspace

Published on: August 8, 2019

Memory mechanisms in grasping.

Constanze Hesse1, Volker H Franz

  • 1Experimental Psychology, University of Giessen, Germany. constanze.hesse@psy.lmu.de

Neuropsychologia
|September 9, 2008
PubMed
Summary
This summary is machine-generated.

Visual information for grasping decays rapidly. Delayed grasping relies on memory mechanisms, similar to grasping larger objects, indicated by increased grip aperture.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • Visual information is crucial for goal-directed movements, especially during memory tasks with delayed execution.
  • The two visual systems hypothesis suggests different processing for visible (dorsal stream) vs. remembered (ventral stream) objects.

Purpose of the Study:

  • To investigate how visual information decay and memory demands affect grasping.
  • To test the two visual systems hypothesis in the context of delayed grasping.

Main Methods:

  • Three experiments examined grasping under full vision and varying delay conditions.
  • Movement kinematics and grip aperture were analyzed to assess visuomotor control.

Main Results:

  • Visuomotor information for grasping decays quickly after stimulus presentation.
  • No evidence supported qualitative shifts in movement or distinct representations for visual vs. memory-guided grasping.
  • Delayed grasping kinematics resembled grasping larger objects under direct vision.

Conclusions:

  • Delayed grasping is primarily governed by general memory mechanisms.
  • An increasing maximum grip aperture in delayed grasping reflects these memory-based adjustments.