Figure 3.

Examples of individual neuronal activity. A–H, Spike raster plots and spike density functions (σ = 100 ms) are shown for example mPFC neurons (Experiment 1). Trials were grouped according to the length of sample interval and the abscissa denotes time since the onset of each sample interval. Gray vertical lines denote the onset and offset of each time interval. As shown, diverse types of neuronal activity were observed during sample interval presentation. The first four (A–D) are examples of ramping activity neurons.