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Related Experiment Videos

Grasping an illusion

E Daprati1, M Gentilucci

  • 1Istituto di Fisiologia Umana, Università di Parma, Italy.

Neuropsychologia
|February 14, 1998
PubMed
Summary
This summary is machine-generated.

Visual analysis for grasping is global, considering the object and its context. Hand shaping during grasp is less affected by visual illusions than length reproduction tasks.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Motor Control

Background:

  • Grasping an object requires complex visual analysis.
  • The influence of surrounding visual cues on grasping is not fully understood.

Purpose of the Study:

  • To investigate the nature of visual analysis during object grasping.
  • To determine how visual illusions affect hand shaping during grasping.

Main Methods:

  • Healthy subjects reached and grasped a bar superimposed on the Müller-Lyer illusion.
  • Vision of hand and object was permitted.
  • Control tasks involved length reproduction.

Main Results:

  • Hand shaping during grasp was influenced by the illusion, but less than in length reproduction tasks.

Related Experiment Videos

  • Visual analysis for grasping is global, integrating object and surrounding cues.

    • Conclusions:

    • Grasping involves two stages: object coding in an object-centered frame and egocentric transformation.
    • Surrounding cues have minimized influence in the egocentric stage of visuo-motor integration for grasping.