In modern medicine, the cause of a person's dementia typically cannot be determined until autopsy. thus, clinical research method continues to be of significance in medicine and psychology.

I believe the answer is: Broca's

He was the first to introduce deficit-lesion method, which examine lesion data in order to determine the brain areas that are involved when we are doing a certain type of cognition process.  Even until today, this method is regarded as the one of the most important invention for data collection in neuro science.

is this an essay or multiple choice

answer; a council of the best hunters;