Don’t get hung up on the idea that grid-cells are only useful for encoding spatial adjacency relationships. As described in the latest Brains@Bay meetup, there is strong evidence that the grid cell mechanisms may also be able to encode (or assist with encoding) arbitrary relationships via learned transitions. It is also fairly likely that there exists a similar mechanism that allows us to encode and recall temporal sequence adjacency. The current TM model does this to some extent for immediate sensory successor/predecessor relationships; however, I’m referring to a the mechanism that allows us to project actions and behaviors forwards and backwards in time over much larger increments.
3 Likes