Hemispheric specialization for the visual control of action is independent of handedness

Claudia L.R. Gonzalez, Tzvi Ganel, Melvyn A. Goodale

Research output: Contribution to journalArticlepeer-review

146 Scopus citations


The idea that visually guided action is independent of visual perception has been supported by neurological, neuropsychological, and behavioral studies. In healthy subjects, evidence for this distinction has come from psychophysical studies of the effects of visual illusions on perceptual judgments and object-directed grasping. This evidence is limited, however, by the fact that virtually all studies have involved right-handed subjects using their dominant hand, which is presumably controlled by the left hemisphere. There is tentative evidence from earlier neurological studies that the left hemisphere may in fact play a special role in the integration of visual and motor information during grasping. We designed two experiments to test this idea. The first experiment involved pictorial illusions, which are known to have robust effects on perceptual judgments but little influence on grasping. Right- and left-handed subjects reached out and grasped objects embedded in two different visual illusions with either their dominant or their nondominant hand. For both right- and left-handed subjects, precision grasping with the left hand, but not with the right, was affected by the illusions. In a follow-up experiment, we examined precision grasping in a more natural setting and showed that left-handed subjects use their nondominant (right) hand significantly more as compared with right-handed subjects. We conclude that visuomotor mechanisms encapsulated in the left hemisphere play a crucial role in the visual control of action and that this hemispheric specialization evolved independently of handedness.

Original languageEnglish
Pages (from-to)3496-3501
Number of pages6
JournalJournal of Neurophysiology
Issue number6
StatePublished - 1 Jun 2006
Externally publishedYes

ASJC Scopus subject areas

  • General Neuroscience
  • Physiology


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