How are predictions sent down the hierarchy? Be it in HTM or DNN or brains.

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The “three visual streams” paper details how the thalamus (pulvinar for the visual system) carries out a predictive feedback system.

The paper is based on the DeepLeabra model and is worth a good look; it does not do a very good job explaining DeepLeabra but there are good papers on this with a little googling.

Thanks Bitking, this is helpful.