Cortical Repetitive Responses Elicited by a Single Contralateral Stimulus

  • Fan Shih-fang
  • Shen Ke-fei


In response to direct cortical stimulation with single stimuli in unanesthetized animals, a train of surface-negative repetitive responses with a frequency of 10–20/sec can be evoked; these can be considered to result from excitation of closed circuits of the cortex and the medial thalamus, the result of periodic impingement of neural impulses on the apical dendrites of pyramidal neurons [1]. In further work, we also observed that after the intensity of stimulation was increased, the contralateral cortex also showed the same type of repetitive response; although the latter was not synchronous with that of the ipsilateral side, it did not disappear upon sectioning the corpus callosum.


Corpus Callosum Contralateral Side Single Stimulus Cortical Response Lower Trace 
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Copyright information

© Consultants Bureau, New York 1997

Authors and Affiliations

  • Fan Shih-fang
    • 1
  • Shen Ke-fei
    • 1
  1. 1.Institute of PhysiologyChinese Academy of SciencesShanghaiChina

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