Comparison of model output to hippocampal data in the morph experiment.

<p><b><i>a</i></b>, Mean correlation between population vectors across the morph sequence. Experimental data in dotted lines and model output in solid lines. Blue: Data from CA1 rate remapping and feedforward model. Purple: Data from CA3 rate remapping and feedback model with overlapping memories. Gray: Data from CA1 global remapping and feedback model with orthogonal memories. Experimental data curves from <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003648#pcbi.1003648-Leutgeb2" target="_blank">[12]</a> and <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003648#pcbi.1003648-Wills1" target="_blank">[4]</a>. <b><i>b-e</i></b>, Cumulative distribution functions (CDF) of population vector correlations for the 6 morphed environments numbered 2-7. <b><i>b</i></b>, for CA1 rate remapping data (Adapted from <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003648#pcbi.1003648-Leutgeb2" target="_blank">[12]</a>). <b><i>c</i></b>, for CA3 rate remapping data (Adapted from <a href="http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1003648#pcbi.1003648-Leutgeb2" target="_blank">[12]</a>). <b><i>d</i></b>, for the feedforward model. <b><i>e</i></b>, for feedback model with overlapping memories (<i>a</i> = 12). <b><i>f</i></b>, Schematic of a population vector (PV). For each position of the environment, a PV consisting of the firing rate of each unit at that position was constructed. Each PV of the first morph shape was then correlated with the corresponding PV of the subsequent 6 morph shapes. The mean of these PV correlations are plotted in <i>a</i> for each morph shape. <b><i>g-i</i></b>, Maximal firing rates of individual units in the model as the morph sequence progressed from square to circle. <b><i>g</i></b>, Units in the feedback model with orthogonal units transitioned abruptly and coherently around the same point of the morph sequence. <b><i>h</i></b>, Units in the feedforward model followed the linear change in the contextual input across the morph sequence. <b><i>i</i></b>, Units in the feedback model with overlapping memories displayed a heterogeneous pattern of responses with both gradually transitioning units and units that transitioned abruptly at different points along the morph sequence.