Figure 4.

In young-adult animals, ±600-cent shifts do not evoke significant vocal adaptation. (A) Changes in vocal pitch in response to a 600-cent downward shift in the pitch of auditory feedback for a single experiment in a young-adult songbird (108 days at shift onset). (B) Combined data for all ±600 cent shifts, reoriented so that vocal changes in the adaptive direction (opposite to the imposed pitch shift) are positive. Dashed line; model fit from the standard exponential model (see Methods). The fit value of c = 0.01 is not significantly different from zero. Note that for ±600 cent pitch shifts in young-adults, the exponential model did not converge on a value of τ. Other plotting conventions as in Figure 3.