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Dual-task interference is greater in delayed grasping than in visually guided grasping.

Anthony Singhal1, Jody C Culham, Eris Chinellato

  • 1CIHR Group on Action and Perception, Department of Psychology, University of Western Ontario, London, ON, Canada. asinghal@ualberta.ca

Journal of Vision
|January 26, 2008
PubMed
Summary

Delayed grasping, unlike visually guided grasping, relies on stored perceptual information. This stored information shares resources with auditory imagery and memory tasks, causing greater interference during delayed grasping.

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Area of Science:

  • Cognitive Neuroscience
  • Human Motor Control
  • Perception and Memory

Background:

  • Visually guided grasping is thought to use real-time dorsal stream control.
  • Delayed grasping is hypothesized to rely on ventral stream stored perceptual information.

Purpose of the Study:

  • To investigate the neural resources supporting visually guided versus delayed grasping.
  • To examine the interaction between grasping tasks and concurrent auditory tasks involving imagery and memory.

Main Methods:

  • Two experiments were conducted combining visually guided and delayed grasping with auditory tasks.
  • Participants grasped objects under conditions of visual guidance or occlusion.
  • Auditory tasks included perception-based imagery (Experiment 1) and semantic memory recall (Experiment 2).

Main Results:

  • Reciprocal interference between grasping and auditory tasks was observed in both experiments.
  • This interference was consistently greater during delayed grasping compared to visually guided grasping.
  • Delayed grasping with a concurrent memory task led to larger grip apertures.

Conclusions:

  • Delayed grasping engages stored, perception-based information that shares cognitive resources with cross-modal tasks.
  • Findings support the distinction between real-time visual control and stored information processing in grasping.