Rats foraged in two identical, connected boxes with 180° opposite orientations (VanRhoads et al., SFN Abs., 2004). In each session, boxes were visited in an A-B-A-B sequence; each visit lasted 4.5 min. Box A place fields were stable across visits. Rat 1 remapped in box B in the first visit. Rat 2 remapped in the second visit. Rat 3 remapped in the third visit (second session). A Poisson hidden Markov model (P-HMM) reconstruction gives a finer grain view. For each rat's first session in which place field correlations indicated remapping, the first box A and B visits were divided into 250 ms bins and a vector of spike counts constructed for each. The second visits of the session served as a reference for their respective maps. The sequence of roughly 2000 vectors from the first visits were used to infer the most likely path through a three-state P-HMM. States Box A and Box B were expected to emit Poisson-distributed spike count vectors whose means were the location-specific mean firing rates measured during ...