Figure 4
From: Rhythmic synchronization tapping to an audio–visual metronome in budgerigars
Examples of the circular distribution of the pecks.
Each circle shows the distribution of the peck responses along the time axis in the hit period of each subject under the 1200-ms-IOI condition. We conducted the Rayleigh test with a specified mean direction for each degree (from 0 to 360 degrees). The red zone indicates the range according to which a significant number of the pecks were directed (P < 0.01). The blue zone indicates the 300-ms stimulus presentation, with a line in the middle showing ERT. The remaining yellow area represents two acceptable periods before and after the stimulus onset. Pecks of Male A, Female B and Female D clearly occurred near the stimulus onset rather than according to the ERT.
