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Can a motion-blind patient reach for moving objects?

T Schenk¹, N Mai, J Ditterich

¹Neurologische Klinik, Klinikum Grosshadern, Ludwig-Maximilians-Universität München, Marchioninistr. 23, 81366 Germany. tschenk@nefo.med.uni-muenchen.de

The European Journal of Neuroscience

|September 21, 2000

Summary

Motion blindness impairs reaching and grasping. Patient LM

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Area of Science:

Neuroscience
Visual Perception
Motor Control

Background:

The visual brain is theorized to have separate pathways for spatial vision: one for perception and one for action.
This study investigates if motion vision is also divided into perception and action streams.

Observation:

The motion-blind patient LM and controls performed a reach-and-grasp task with a moving object.
Experiments varied target speed, observation time, and visual feedback.
LM could only reach for objects moving at 0.5 m/s or less, unlike controls who could reach up to 1.0 m/s.

Findings:

LM's reaching movements adapted to target speed with full vision, but she required longer observation times and visual feedback.
Her performance in the action task was better than predicted by her impaired motion vision perception.
Impairments in both perception and action were observed in LM.

Implications:

The findings suggest the motion area MT/V5 is crucial for both visual perception and action.
This early-stage extrastriate area likely provides input to both visual processing streams.
Understanding these pathways is key to comprehending visual guidance of movement.

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