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DAF increases the duration of the time interval between Bengalese finch song syllables. Shown above are the histograms of the time intervals between two subsequent syllables in the song in the presence of DAF (blue) and without DAF (red). The means are: Δ tmean = 74.8 ms (control, N = 637 syllables) and Δ tmean = 75.7 ms (feedback, N = 97 syllables), the difference is statistically significant (p = 0.001, two-way Kolmogorov–Smirnov test).
