Plural of commissurotomy; surgical procedures that cut the connections between brain parts, especially the corpus callosum.
From commissure + -tomy suffix (meaning 'cutting'). Plural -ies form.
In the 1960s-70s, neurosurgeons performed 'split-brain' commissurotomies on epilepsy patients—researchers discovered that cutting the corpus callosum created two independent consciousnesses in one head, one of neuroscience's strangest findings.
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