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comment by ESRogs · 2019-08-26T23:25:12.251Z · LW(p) · GW(p)
and that displacement cells both exist and exist in neocortex

Both exist and exist?

Replies from: adam_scholl
comment by Adam Scholl (adam_scholl) · 2019-08-26T23:45:42.700Z · LW(p) · GW(p)

Grid cells are known to exist elsewhere in the brain—for example, in the entorhinal cortex. There are preliminary hints that grid cells may exist in neocortex too, but this hasn't yet been firmly established. Displacement cells, on the other hand, have never been observed anywhere—they're just hypothesized cells Hawkins predicts must exist, assuming his theory is true. So I took him to be making a few distinct claims: 1) grid cells also exist in neocortex, 2) displacement cells exist 3) displacement cells are located in neocortex.

Replies from: adam_scholl
comment by Adam Scholl (adam_scholl) · 2019-08-29T07:09:38.136Z · LW(p) · GW(p)

The specifics of the proposal, at least, seem relatively easy to falsify. For example, he not only predicts the existence of cortical grid and displacement cells, but also their specific location—that they'll be found in layer 6 and layer 5 of the neocortex, respectively. So we may find out whether he's right fairly soon.