Hearing Sensation Levels of Emitted Biosonar Clicks in an Echolocating Atlantic Bottlenose Dolphin
Figure 3
Examples of AEP responses to emitted biosonar clicks.
The AEPs were presented after averaging AEP records within each 5-dB bin of the corresponding click SLs in target-present (a) and target-absent (b) conditions. The 5-dB bins (±2.5 dB) of click SLs are indicated near the records in dB re 1 μPa. N—number of averaged records. Note that nearly all of the averaged AEP responses had an AEP waveform locating between 1.5 and 3.5 ms in the records well exceeding noise level, consisting of a couple of alternative positive-negative short waves (each shorter than 1 ms). The zero point of the time scale corresponds to the time point when the hydrophone (h in Fig. 9) picked up the clicks and triggered the AEP recordings.