Fig. 9.

Performance of the P. podagrosus AN1 filter for the representation of conspecific signals in background noise. One example of AN1 activity in response to conspecific calling song and background noise is shown under various signal-to-noise (S:N) ratios from 3 to −9 dB. Note the lack of activity in the noise-only situation before the conspecific stimulus started (S:N ratio 3 dB) and the increasing activity with decreasing S:N ratios of 0 and −6 dB. Yet, the temporal pattern of the calling song is still preserved in the firing pattern. Note also the suppression of activity during the time in between the two series of calling songs, at the same S:N ratios. Complete masking occurs at an S:N ratio of −9 dB.