Direction information coordinated via the posterior third of the corpus callosum during bimanual movements

James C. Eliassen, Kathleen Baynes, Michael S. Gazzaniga

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


We examined bimanual coordination in a patient before and after each stage of callosotomy surgery. We tested how well the patient coordinated movement direction between the hands. The patient drew symmetrical or asymmetrical figures simultaneously with both hands. Before surgery, symmetrical figures were drawn well and asymmetrical figures were drawn poorly. Following anterior callosotomy, the drawings improved slightly. Symmetrical figures were still drawn well, and asymmetrical ones were still drawn poorly. Thus, spatial integration remained intact despite the loss of interhemispheric communication between frontal cortical sites. After posterior callosotomy, spatial coordination deteriorated significantly. Mirror-image drawings became less symmetrical, while asymmetrical drawings improved. These data indicate that the posterior callosum mediates the coordination of direction information between the hands during bimanual movements. Given the topographical organization of the corpus callosum, this integration is likely carried out by parietal cortex.

Original languageEnglish (US)
Pages (from-to)573-577
Number of pages5
JournalExperimental Brain Research
Issue number4
StatePublished - 1999


  • Bimanual coordination
  • Callosotomy

ASJC Scopus subject areas

  • Neuroscience(all)


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