arena ([18••], Figure 2). Moreover, a comparison of mPFC–hippocampus coherence spectra from wild-type mice reveals a trend toward increased hippocampal–mPFC coherence in the slow, but not fast, gamma frequency range during the choice phase of a delayed non-match-to-sample spatial memory task ([25•], Figure 3). These findings support the hypothesis that slow and fast gamma oscillations are functionally distinct in the hippocampal–mPFC network, as has been suggested previously for the entorhinal–hippocampal network [31••] and the ventral striatum [32].
