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Fig. 5. Call amplitude as a function of time relative to modified feedback. In the
Begin condition (A) calls with modified feedback (MFB, dotted lines) were
louder than those with normal feedback (NFB, broken lines), which were not
significantly different from Baseline calls (Base, gray lines). In the End
condition (B) neither modified feedback nor normal feedback calls were
significantly different each other or from Baseline. Although there was no
amplitude difference between normal feedback and modified feedback calls in
the Random condition (C), both modified and normal feedback calls were louder
than baseline calls. In Begin and Random conditions calls were only
significantly louder than Baseline calls in the portion of the call that
received modified feedback. Values are means ± s.e.m. (for number of
calls in each condition, see Table
1).