(A) Adult common marmosets all exhibit a prominent white facial patch on their foreheads. We measured their area using image analysis software.
(B) Example of a vocal exchange between two adult marmosets. Top panel shows the time-amplitude waveforms, and the bottom panel shows the spectrogram.
(C) Correlation between white patch size and probability to respond to a conspecific call. Red solid line is the regression line, the blue circles are the data points, and the dotted red lines show the 95% confidence interval.
See Figure S1.