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Transcallosal inhibition in patients with callosal infarction
Jie-Yuan Li1, Ping-Hong Lai, Robert Chen
1Division of Neurology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, R.O.C.
Journal of Neurophysiology
|November 9, 2012
Summary
Callosal infarction significantly reduces transcallosal inhibition, impacting motor cortex communication. These inhibitory pathways predominantly travel through the posterior corpus callosum (CC).
Area of Science:
- Neuroscience
- Neurophysiology
- Neurology
Background:
- Motor pathways communication relies on interhemispheric connections via the corpus callosum (CC).
- Previous studies suggested posterior CC involvement in motor fiber transmission, but this remained unverified in patients with CC infarction.
Observation:
- This study investigated transcallosal inhibition in 26 patients with callosal infarction and 14 healthy controls.
- Transcranial magnetic stimulation assessed ipsilateral silent period (iSP) and interhemispheric inhibition (SIHI, LIHI) in relation to lesion location within the CC.
Findings:
- Callosal infarction bilaterally reduced iSP and interhemispheric inhibition compared to controls.
- Lesions in the posterior CC (segment 3) were associated with greater reductions in iSP and SIHI.
- Posterior CC lesion burden negatively correlated with transcallosal inhibition measures.
Implications:
- Callosal infarction impairs transcallosal inhibition, affecting motor cortex interactions.
- The posterior half of the CC is crucial for transmitting fibers mediating transcallosal inhibition.
- Findings clarify the anatomical substrates of interhemispheric motor control and the impact of focal CC lesions.
