Historical brain probing experiments lack significant learning value due to imprecise electrode placement and lack of advanced imaging.

“historically without much regulation we've we've probed the brain uh the problem we can't learn a lot from those experiments now uh well in this way at least we don't know exactly where those electrodes were we didn't have MRI scanning or high quality cat scanning to to know where those electrodes were with certainty where and we know two or three millimeters matters and we also didn't have the tools to place electrodes in a precise way back then so unfortunately we can't learn a lot from those experiments”