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Related Experiment Video

Updated: May 26, 2026

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

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

Published on: January 15, 2018

Repetition effects in grasping.

Peter Dixon¹, Scott McAnsh, Lenore Read

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

Canadian Journal of Experimental Psychology = Revue Canadienne De Psychologie Experimentale

|December 14, 2011

Summary

This summary is machine-generated.

The tendency to repeat a hand grasp is strongly tied to the specific object being grasped, not the general context or hand used. This grip repetition effect appears to be a memory recency phenomenon.

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Area of Science:

Cognitive Psychology
Motor Control
Neuroscience

Background:

Understanding how memory influences motor actions is crucial for explaining human behavior.
The repetition effect, a tendency to repeat previous actions, is well-documented but its underlying mechanisms remain debated.
Investigating grip selection provides insights into the interplay between perception, memory, and action planning.

Purpose of the Study:

To investigate the factors influencing the grip repetition effect during object manipulation.
To determine whether the repetition effect is object-specific or influenced by broader contextual factors.
To explore the role of memory retrieval in action selection and repetition.

Main Methods:

Participants grasped novel objects with two possible grips, with object versions designed to bias grip choice.
Experiments manipulated object identity, global context (grip likelihood), hand used, and object location/orientation.
The repetition effect was measured as the tendency to repeat the previously used grip.

Main Results:

The grip repetition effect was highly specific to the object being grasped, diminishing significantly with different objects.
Contextual manipulations (grip likelihood, hand, object location/orientation) had minimal impact on the repetition effect.
The effect persisted over multiple intervening trials, indicating a robust memory component.

Conclusions:

Grip selection and repetition are primarily driven by object-specific memory retrieval, not general context.
The object serves as a critical cue for recalling action features from memory.
The grip repetition effect is best understood as a memory recency effect, where recent actions on specific objects influence current choices.