Differences in reward biased spatial representations in the lateral septum and hippocampus.

In the LS, the difference seen in the number of fields on the forced side versus choice side was most stark when the animal was traveling away from reward (two-tailed two sample t-test t(218)=3.8 p<0.001), although there was a clear trend while the animal traveled toward reward (two-tailed two sample t-test t(254)=1.82 p<0.1) ( Figure 6G ).

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Because skew can be sensitive to changes in speed, we also computed the firing rate asymmetry index (FRAI, see methods) ( Mehta et al., 2000 ) for HPC and LS cells, and found a highly significant relationship between skew and FRAI values ( Figure 5—figure supplement 5 ), showing that skew cannot be explained by the animal’s speed.

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