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Related Experiment Video

Updated: Jul 5, 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

Perceptuo-motor interactions during prehension movements.

Lennart Verhagen¹, H Chris Dijkerman, Meike J Grol

¹F. C. Donders Centre for Cognitive Neuroimaging, Radboud University Nijmegen, 6500 HB, Nijmegen, The Netherlands. l.verhagen@uu.nl

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|May 2, 2008

Summary

This study reveals how the brain processes visual information for grasping. The dorsomedial stream automatically handles object slant, while the dorsolateral stream adapts grip based on viewing conditions and depth cues.

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Area of Science:

Neuroscience
Cognitive Neuroscience
Motor Control

Background:

Adaptive behavior integrates perceptual and motor functions.
Understanding perceptuo-motor interactions is crucial for characterizing brain processes during actions like grasping.

Purpose of the Study:

To characterize cerebral processes during perceptuo-motor interactions in prehension movements.
To investigate the roles of different visual streams (dorsal, ventral, dorsomedial, dorsolateral) in processing object slant and depth cues during grasping under varying viewing conditions.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to measure brain activity in healthy humans.
Participants performed prehension movements while object slant and viewing conditions (binocular vs. monocular) were manipulated.
This design modulated the reliance on different depth cues and biased visual processing between dorsal and ventral streams.

Main Results:

The dorsomedial visuomotor stream, including areas V6A and PMd, showed increased activity with object slant irrespective of viewing conditions.
Areas in the dorsolateral stream (AIP, PMv) and ventral stream (LOtv) exhibited slant-dependent responses, particularly under monocular viewing requiring pictorial depth cue processing.
Functional coupling increased between AIP, LOtv, and PMv under monocular viewing with increasing slant.

Conclusions:

The dorsomedial stream is automatically engaged in processing visuospatial parameters for grasping, independent of viewing conditions or object properties.
The dorsolateral stream dynamically adapts motor behavior by integrating perceptual information from the ventral stream into the prehension plan based on current environmental demands.