A Probabilistic Palimpsest Model of Visual Short-term Memory
Figure 4
Recall model and posterior for different population codes.
(A) Example memory states for the different population codes, when three items are stored. Coloured circles indicate the veridical feature values. Left: Conjunctive population code, involving little interaction even between nearby items. Middle: Feature population code. Right: Mixed population code — a few conjunctive units provide just enough binding information to recall the features associated with the appropriate items. (B): Cued posterior probabilities, given the veridical colour to be recalled (the three curves correspond to cueing the three possible colours; vertical bars indicate the true stored orientations). (C) Graphical model representation of the process of recall. The final memory state and colour are observed; the orientation must be inferred.