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Integration and multiplexing of positional and contextual information by the hippocampal network
Fig 2
Decoding the cognitive map from neural activity.
A. Map-decoding procedure applied to constant-environment reference sessions. The log-ratio 
, Eq (1), which is the difference of likelihoods of map A and B given the recorded neural pattern in theta bin t (Methods), is mostly positive in the reference session with constant light-cue evoking A (blue) and mostly negative in the reference session B (grey). B. Time course of 
in a portion of the test session around one light switch (red vertical line). The emergence of flickers (disagreement between the recalled map and the light cue) is clearly visible after the light switch. Yellow horizontal dashed lines show the statistical threshold applied in map decoding and flicker identification (
, Methods). Yellow bars represent the identified flicker instabilities, i.e. significative discordances (
) between the decoded cognitive map (here, B) and the post-switch light conditions (here, A). C. time correlation of flickers, computed with significance threshold L0 = log 10. The exponential fit shows that correlations extend over ∼6 theta bins, highlighting the tendency of the cognitive map to persist beyond the theta cycle.
doi: https://doi.org/10.1371/journal.pcbi.1006320.g002