Walnut-sized chunks in the middle of both their heads
When Squire received the images of Eugene’s brain, he marveled at how similar it seemed to H.M.’s. There were empty, walnut-sized chunks in the middle of both their heads. Eugene’s memory-just like H.M.’s- had been removed. As Squire began examining Eugene, though, he saw that this patient was different from H.M. in some profound ways. Whereas almost everyone knew within minutes of meeting H.M. that something was amiss, Eugene could carry on conversations and perform tasks that wouldn’t alert a casual observer that anything was wrong.