Fig. 3. T-cell responses to pulsed sound in katydids. (A) Synchronized oscillograms of a double electrode recording from Amblycorypha oblongifolia. Top trace: descending ipsilateral connective from the prothoracic ganglion; middle trace: ascending ipsilateral connective from the prothoracic ganglion; bottom trace: microphone recording of the sound stimulus (a 10 ms 25 kHz pulse). (B) Audiogram curves of threshold T-cell responses to 10 ms pulses for Amblycorypha oblongifolia (N=12) and Neoconocephalus ensiger (N=17). Asterisks indicate significant differences between species (t-tests, P<0.0025).