Figure 4.
Range adaptation in the valuation system. a. Model of neuronal adaptation. The cartoon depicts the activity of a value-encoding neuron adapting to the range of values available in different conditions. The x-axis represents value, the y-axis represents the firing rate and different colors refer to different value ranges. In different conditions, the same range of firing rates encodes different value ranges. b. Neuronal adaptation in the OFC. The figure illustrates the activity of 937 offer value responses. Each line represents the activity of one neuron (y-axis) plotted against the offer value (x-axis). Different responses were recorded with different value ranges (see color labels). While activity ranges vary widely across the population, the distribution of activity ranges does not depend on the value range. c. Population averages. Each line represents the average obtained from neuronal responses in 4b. Adaptation can be observed for any value, as average responses are separated throughout the value spectrum. Similar results were obtained for neurons encoding the chosen value. Adaptation was also observed for individual cells recorded with different value ranges. Adapted from Padoa-Schioppa (2009) J Neurosci (Soc for Neurosci, with permission).