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Related Experiment Videos

Timecourse of preshaping for functional responses to objects.

J W Pellegrino1, R L Klatzky, B P McCloskey

  • 1University of California, Santa Barbara, Santa Barbara, California, USA.

Journal of Motor Behavior
|September 1, 1989
PubMed
Summary
This summary is machine-generated.

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This study reveals that the hand forms distinct preshapes for different object contacts, like poking or pinching. These hand shaping movements occur similarly before reaching, but adjust timing before contact based on object size and grip type.

Area of Science:

  • Motor Control
  • Human Movement Science
  • Cognitive Neuroscience

Background:

  • Understanding how the human hand prepares for interaction with objects is crucial for fields like robotics and rehabilitation.
  • Previous research has explored hand shaping, but the precise nature and timing of distinct preshapes for varied object contacts remain an area of investigation.

Purpose of the Study:

  • To investigate whether distinct, identifiable hand preshapes are formed in preparation for different types of object contact.
  • To examine if these preshapes differ for prehensile (grasping) versus nonprehensile (e.g., pointing) actions.
  • To analyze the temporal dynamics of hand preshaping relative to reaching onset and object contact.

Main Methods:

  • Participants performed reaching and grasping tasks involving common objects.

Related Experiment Videos

  • Kinematic data of hand movements were recorded and analyzed.
  • Four distinct hand shapes (poke, pinch, palm, clench) were examined for prehensile and nonprehensile actions.
  • Temporal analysis focused on the onset of reaching, preshape formation, and time to object contact.

    • Main Results:

    • All four examined hand shapes (poke, pinch, palm, clench) demonstrated distinct preshaping.
    • The timing of finger separation, initial preshape feature formation, and preshape completion was consistent across all hand shapes relative to reaching onset.
    • The time between preshape completion and object contact varied: longer for small contact surfaces and prehensile shapes compared to large surfaces and nonprehensile shapes.
    • These temporal differences were linked to the required precision for the final object interaction.

    Conclusions:

    • The human hand utilizes specific, identifiable preshapes tailored for different functional contacts with objects.
    • While the general timing of preshape formation is consistent, the duration of the preshape phase is modulated based on object properties (size) and action type (prehensile vs. nonprehensile).
    • These findings highlight the anticipatory and adaptive nature of motor control in skilled object interaction.