Fig. 11.
Distribution of the modulation indices for the membrane potential and for the firing rate. The vertical line indicates a standard criterion for classifying simple and complex cells based on the spike responses (Skottun et al., 1991).Filled symbols indicate cells that are defined as complex (spike modulation index, <1). Open symbolsindicate cells that are defined as simple (spike modulation index, >1). The horizontal line indicates a possible criterion to classify cells based on their membrane potential responses.