Figure 2.

Place field plasticity on the first day of exposure to the novel arm. Each row represents the activity of a single neuron in one direction on the track. A, C, E, Examples of the spatial intensity (place field) at four different times. B, D, F, The integrated spatial intensity plotted as a function of the total experience in the novel arm. The four gray circles represent the times for the place fields shown in A, C, and E. The tick marks on the top x-axis represent the times at which the animal completed a full pass through the novel arm. These three neurons illustrate the variety of changes seen during the novel experience, including the sudden development of new fields (A, B), changes in location of fields (C, D), and decreases in activity of neurons with fields that were apparent from the beginning of the experience (E, F).