Müller-Lyer figures influence the online reorganization of visually guided grasping movements

In advance of grasping a visual object embedded within fins-in and fins-out Müller-Lyer (ML) configurations, participants formulated a premovement grip aperture (GA) based on the size of a neutral preview object. Preview objects were smaller, veridical, or larger than the size of the to-be-grasped t...

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Bibliographic Details
Published in:Experimental brain research 2006-03, Vol.169 (4), p.473-481
Main Authors: Heath, Matthew, Rival, Christina, Neely, Kristina, Krigolson, Olav
Format: Article
Language:English
Subjects:
Adult
Analysis of Variance
Feedback
Female
Hand Strength - physiology
Humans
Illusions - physiology
Kinesiology
Male
Movement - physiology
Online Systems
Photic Stimulation - methods
Psychomotor Performance - physiology
Reaction Time - physiology
Time Factors
Visual Perception - physiology
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Summary:In advance of grasping a visual object embedded within fins-in and fins-out Müller-Lyer (ML) configurations, participants formulated a premovement grip aperture (GA) based on the size of a neutral preview object. Preview objects were smaller, veridical, or larger than the size of the to-be-grasped target object. As a result, premovement GA associated with the small and large preview objects required significant online reorganization to appropriately grasp the target object. We reasoned that such a manipulation would provide an opportunity to examine the extent to which the visuomotor system engages egocentric and/or allocentric visual cues for the online, feedback-based control of action. It was found that the online reorganization of GA was reliably influenced by the ML figures (i.e., from 20 to 80% of movement time), regardless of the size of the preview object, albeit the small and large preview objects elicited more robust illusory effects than the veridical preview object. These results counter the view that online grasping control is mediated by absolute visual information computed with respect to the observer (e.g., Glover in Behav Brain Sci 27:3-78, 2004; Milner and Goodale in The visual brain in action 1995). Instead, the impact of the ML figures suggests a level of interaction between egocentric and allocentric visual cues in online action control.
ISSN:0014-4819
1432-1106
DOI:10.1007/s00221-005-0170-3