Judged: two independent readers; copy check clear.
left brain
left brain In this historical account, the left brain means the left cerebral hemisphere, viewed as taking the leading role in speech and in turning more automatic activity into voluntary action.
In this historical account, the left brain means the left cerebral hemisphere, viewed as taking the leading role in speech and in turning more automatic activity into voluntary action. Injury to certain left-sided areas was described as causing aphasia, while the right hemisphere was thought to have a similar but usually less dominant part.