(a) Representative activity of a single CA1 principal cell during the odor sampling intervals of Correct Trials Only. Each row of tick marks represents spiking during a single trial. This cell demonstrates activity selective for position 2. (b) Same as in a, showing the activity of a principal cell that is selective for the co-occurrence of odor A in position 2. For additional examples of theta4-12 Hz, beta15-35 Hz, low gamma35-55 Hz, and high gamma65-90 Hz coherent principal cells, see Figure 6—figure supplement 1–4. (c) Median information (bits/spike) in theta4-12 Hz, beta15-35 Hz, low gamma35-55 Hz, and high gamma65-90 Hz coherent populations for odors during a 500 ms interval prior to nose poke (before), 500 ms directly after odor delivery (odor), and 500 ms prior to the end of the nose poke when the rat committed to a decision (end). Vertical gray bars indicate the inter-quartile range. The top vertical line indicates q3 + 1.5 x (q3 – q1) and the bottom vertical line indicates q1 – 1.5 x (q3 – q1), where q1 and q3 are the 25th and 75th percentiles, respectively. Asterisks (*) indicate a significant pair-wise comparison using a Tukey’s Honest Significant Difference test, p<0.05. (d) Same as in c, for position information. (e) Same as in c, for odor-position information. (f) Cartoon diagram indicating potential mechanisms for the generation of the beta15-35 Hz rhythm in CA1: 1) beta15-35 Hz rhythmic input is received from an upstream structure, 2) beta15-35 Hz is an internally generated rhythm, or 3) long-range communication across multiple interacting networks is facilitated by coordination in beta15-35 Hz by a third-party structure.