Experimental Brain Research

, Volume 128, Issue 4, pp 573–577

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

  • James C. Eliassen
  • Kathleen Baynes
  • Michael S. Gazzaniga
Research Note

DOI: 10.1007/s002210050884

Cite this article as:
Eliassen, J., Baynes, K. & Gazzaniga, M. Exp Brain Res (1999) 128: 573. doi:10.1007/s002210050884


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.

Key words Bimanual coordinationCallosotomy

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • James C. Eliassen
    • 1
  • Kathleen Baynes
    • 1
  • Michael S. Gazzaniga
    • 3
  1. 1.Center for Neuroscience, University of California at Davis, Davis, CA 95616, USAUS
  2. 2.VA Northern California Health Care System, Martinez, CA 94553, USAUS
  3. 3.Center for Cognitive Neuroscience, Dartmouth College, Hanover, NH 03654, USAUS
  4. 4.Department of Neuroscience, Box 1953, Brown University, Providence, Rhode Island 02912, USA, e-mail: James_Eliassen@Brown.edu, Tel.: 401–863–9984, Fax: 401–863–1074IS