tokens: We have previously reported reduced levels of choline acetyltransferase activity in the cerebral cortex of patients who died after a head injury , demonstrating that there is a loss of cortical cholinergic innervation .
folded_tokens: we have previously report reduce level of choline acetyltransferase activity in the cerebral cortex of patient who die after a head injury , demonstrate that there be a loss of cortical cholinergic innervation .