Fig. 4. (A) Example of an electrode implant recording (upper) with the corresponding bat vocalizations taken from the bat detector (below). The responses of 501-T3 are in red. 501-T3 responses occur only after a bat vocalization, and each vocalization elicits a 501-T3 response, indicating that the interneuron can encode the bat’s pulse repetition rate. Time scale, 50 ms; voltage scale, 20 mV. (B) Same recording with the time scale expanded to illustrate that the responses of 501-T3 (in red) to a single bat vocalization contain multiple spikes. The first spike in each burst of 501-T3 activity has a larger amplitude than the following spikes because of its very high phasic firing rate. Time scale, 10 ms; voltage scale, 20 mV.
