Figure 8.

Noncoherent and coherent AC cue-selective neurons. A, B, Noncoherent. A, Raster plot of AC cue-selective neuron in which spiking pattern is noncoherent (coh, not significant) with licking. The raster on the top panel shows C+ trials, and the raster on the bottom panel shows C− trials. Cues were delivered at time 0 s. The dashed line indicates the learning trial. Pre, Prelearning; Post, postlearning. The adjacent right panels display the corresponding PSTHs during the prelearning (top) and postlearning phase (bottom). The percentage of trials correctly discriminated by the classifier (OLVQ) are also shown. Note that, after learning, this OFC neuron developed a larger cue discrimination. B, The overall mean firing rate of the neuron shown in A is illustrated during the entire delay epoch as a function of learning phase. It is seen that differences in firing rate between the cues were observed only in the postlearning phase. The C+ trials are shown in green, and C− trials are shown in red. **p < 0.05. C, D, Coherent. C, Raster plot and corresponding PSTHs of a lick-coherent and AC cue-selective neuron. Conventions are the same as given in A. Note that this OFC licking-coherent neuron achieved better cue discrimination than that obtained by the noncoherent neuron shown in A. D, The overall firing rate of neuron shown in C during the delay epoch as a function of learning phase. It is seen that differences between the cues were only observed in the postlearning phase. Green, C+; red, C−. **p < 0.05. Error bars indicate SEM.