Figure 8. Task-specific gamma inputs and phase-precession during memory guided navigation.

(A) Delayed alternation task. Black lines, trajectory of the rat in a single session. Highlighted red and blue segments show sampled areas. (B) Theta phase distribution of deep and superficial CA1 pyramidal neurons in central and side arms. Note that many deep neurons fire at theta peak in the side arm (C) Central/side arms ratios for spike-gamma phase coupling. Place cell spikes are more strongly coupled to CA3 gamma_S in the center (memory retrieval) arm while in the side arms they are preferentially entrained by EC3 gamma_M. (D) Range, onset and slope of phase precession for place fields in the center and side arms. Note more limited phase-precession span and earlier theta-phase onset in the central arm, likely due to an increased CA3 input strength. (*/**/*** p < 0.05/0.01/0.001, Wilcoxon signed-rank for within-group and rank-sum test for across-group comparisons).