Input and network activities during learning and recall.

<p><i>s</i>_<i>k</i>, <i>x</i>_<i>i</i>, <i>y</i>_<i>j</i>, <i>z</i>_<i>k</i> during learning (after 5 presentations) (a) and during sequence recall (after 120 presentations) (b). Within each layer, different colors represent different modes (variables). The sensory input (presented only during learning) consisted of 24 different patterns presented sequentially. The patterns were composed of 144 binary (represented in black and white) pixels. During learning, the input drives the system dynamics. During recall, the elementary modes and the chunking modes activate in the same order as in learning. Each CM represents about 8 consecutively active elementary modes. The onset of each chunk is delayed and caused by the inhibition from the chunking layer. It is consistent with pauses before loading chunks observed in behavioral studies (highlighted in dashed line). (c) Duration that each EM remains active, with the same color codings as in (b). Three modes associated to the transitions between chunks remain active for a longer time than the others. Such pauses can be identified with pauses observed in behavioral experiments involving chunking [<a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1004592#pcbi.1004592.ref017" target="_blank">17</a>].