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Related Experiment Videos

Target viewing time and velocity effects on prehension.

A H Mason1, H Carnahan

  • 1Department of Kinesiology, University of Waterloo, Ontario, Canada.

Experimental Brain Research
|July 29, 1999
PubMed
Summary
This summary is machine-generated.

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Researchers found that movement time, not velocity, is key for reaching and grasping moving objects. Target velocity influenced grasp shaping but not the initial reach, suggesting independent control of movement phases.

Area of Science:

  • Motor Control
  • Human Movement Science
  • Biomechanics

Background:

  • Understanding how humans control prehensile movements (reaching and grasping) is crucial for fields like robotics and rehabilitation.
  • The interplay between target motion characteristics and the distinct phases of prehension (transport and grasp) requires further elucidation.

Purpose of the Study:

  • To determine whether movement time or velocity of a target is more critical for controlling the transport and grasp-preshape components of prehensile movements during interception.
  • To investigate the independent contributions of target velocity and movement time to different phases of object interception.

Main Methods:

  • Participants performed reach-grasp-lift tasks on objects moving at various velocities (500–1250 mm/s) under two conditions: distance-controlled and viewing-time-controlled (1000 ms visibility).

Related Experiment Videos

  • Kinematic data, including transport and grasp aperture parameters, were analyzed to assess the influence of target motion characteristics.

    • Main Results:

    • In the distance-controlled condition, target velocity affected transport-related measures. However, these effects disappeared when viewing time was controlled, indicating reliance on movement time.
    • Grasp-preshape (aperture) spatial aspects (peak aperture, peak aperture velocity) were influenced by target velocity irrespective of the condition.
    • The timing of peak aperture was sensitive to target velocity in the distance-controlled condition but not in the viewing-time-controlled condition.

    Conclusions:

    • The transport and grasp-preshape phases of prehension are generated independently.
    • Target velocity information is utilized for grasp spatial control but its use for transport control is limited, especially when movement time is the primary cue.
    • Movement time is a significant factor in the online control of the transport component during interception tasks.