Figure 2. Responses to pure tones in primary auditory cortex from awake monkeys 40 and firing rates from primary auditory cortex in rats 2.
A: Distribution of spike rates to a 50ms tone ( n = 119, red) 100ms tone ( n = 115, blue), or 200ms tone ( n = 23, green) in primary auditory cortex in monkeys 40. B: Histogram for spike rate distribution for the 100ms tone response ( n = 115) fitted by an exponential (red) or lognormal (blue) distribution 40. C: Spontaneous spike rate distribution from primary auditory cortex in unanesthetized rats 2 fitted by an exponential (red) or lognormal (blue) distribution. Note that the spontaneous firing rates are much lower and narrower distributed than evoked spikes in response to stimuli at short time scales ( B), but that they still follow a lognormal distribution.