Figure 1.

Hippocampal Episode Fields after Learning. Plots A–H show examples of individual neurons that exhibited EFs during the intertrial delay period, while the rats were performing at asymptote. Each plot was constructed from the data of a single neuron recorded during a single session. For each plot, the trial by trial firing of the neuron is shown, one trial per row. The first fourteen trials (the go east condition) are shown in the top half of the plot, while the second fourteen trials (the go west condition) are shown in the bottom half. Different neurons fired at different times throughout the delay period. Time (sec) from the start of the variable delay period is shown for each plot. Also shown are examples (plots C and F) of the movement paths of the rats head (grey lines) and neuronal firing (red dots) during the delay period. The platform is indicated by the dashed rectangle. Plot I shows the firing of 53 neurons, recorded from 41 sessions in 12 rats. Each row illustrates the firing of a single neuron, averaged across the 14 trials of the go east condition, arranged according to the time of firing to illustrate the distribution of firing across the duration of the intertrial delay period.