Fig. 11.

Rasters and spike density plots of the activity of a neuron responding at the time of reward apparatus activation.A, B, Vertical lines(y-axis) indicate the onsets of activation of the reward apparatus. A, Neuronal responses in the brightening paradigm sorted by the schedule fraction. The neuron responded significantly more strongly in 3/3, 2/2, and 1/1 conditions.B, Neuronal responses in the random paradigm sorted by the cue brightness. The neuronal responses to the brightest cue condition was now no bigger than the response to the other cue brightnesses.