Figure 6.

Average similarity of hippocampal representations of object encounter events. The similarity of hippocampal representations was represented as the average standardized distances between multivariate data points for each object encounter event and all other events in one of four categories: encounters with the same object in the same location, encounters with a different object in the same location, encounters with the same object in a different location, and encounters with a different object in a different location. Shorter distances indicate greater similarity of neural patterns. Encounters with the same object were more similar than encounters with different objects (* indicates a P-value less than 0.01 from a paired samples t-test) but only when the encounters were in the same location (n.s. indicates not statistically significant; P > 0.05; for full statistical analyses, see text). Error bars, SEM across the four rats.