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Perseveration and contrast effects in grasping.

Peter Dixon1, Scott Glover

  • 1Department of Psychology, University of Alberta, Edmonton, Alberta, Canada. peter.dixon@ualberta.ca

Neuropsychologia
|January 24, 2009
PubMed
Summary
This summary is machine-generated.

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Sequential grasping involves two effects: perceptual contrast and motor perseveration. These influence grip aperture, with context and task altering their manifestation in reaching movements.

Area of Science:

  • Cognitive Psychology
  • Motor Control
  • Human Perception

Background:

  • Sequential effects significantly influence motor tasks, including grasping.
  • Understanding these effects is crucial for deciphering the interplay between perception and action.

Purpose of the Study:

  • To investigate sequential effects on grip aperture during disc grasping.
  • To differentiate between perceptual contrast and motor perseveration mechanisms.

Main Methods:

  • Grip aperture was measured during reaching tasks involving sequential disc sizes.
  • Experiment 2 introduced context discs to isolate perceptual effects.
  • Experiment 3 assessed perceptual effects without a grasping requirement.

Main Results:

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Related Experiment Videos

Last Updated: Jun 26, 2026

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
10:51

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans

Published on: January 15, 2018

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
09:41

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping

Published on: April 21, 2023

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
09:49

Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior

Published on: April 16, 2014

  • A biphasic effect (contrast then perseveration) was observed in Experiment 1.
  • Contextual cues in Experiment 2 eliminated contrast effects, leaving only perseveration.
  • Perceptual contrast effects were isolated in Experiment 3 when grasping was absent.

Conclusions:

  • Grasping involves both perceptual contrast and motor perseveration.
  • Perceptual contrast is influenced by context and task demands.
  • Motor perseveration reflects the reuse of motor control parameters.