Supplementary Figure 12: Population responses were temporally precise and reliable across syllable repetitions.
From: Emergent tuning for learned vocalizations in auditory cortex
a, Top, Spectrograms of different syllables from ZF and BF songs. Bottom, Overlaid mean pPSTHs from the deep-region of zfZF birds (orange, n = 270 neurons) and zfBF birds (brown, n = 136 neurons) show responses to different renditions of the same syllable type (aligned to onset). Bars along the top denote sustained differences (≥10 ms) between bird groups to a single syllable and are separated vertically for different syllable occurrences. b, Same as a, but showing LF and BF syllables and deep-region pPSTHs from lfLF birds (gray, n = 224 neurons) and lfBF birds (light blue, n = 75 neurons). c, The similarity of population responses to different utterances of a syllable type was measured as the mean of the absolute difference between pPSTHs. The differences within bird groups (filled boxplots) were smaller than the differences between groups (open) in nearly all cases (Tukey-Kramer post hoc tests, 15/16 P < 0.03 across all four AC regions per bird group). For zfZF-zfBF, n = 44 syllable types (ZF and BF combined) occurred multiple times in a stimulus; for lfLF-lfBF, n = 39 syllable types (LF and BF). The measure of center is the median, box limits show the 25th and 75th percentiles, whiskers extend up to 1.5× the interquartile range beyond the quartiles; and circles show outliers. ***P < 0.001.
