Figure 3.

Examples of the subjects' vocalizations produced to solve the echo-acoustic task. Top, Exemplary spectrograms (Row 1) and oscillograms (Row 2) are shown for three typical participants. Bottom, A detailed correlation analysis between the individual psychophysical performances and specific call parameters. Each star corresponds to one subject. Top right, Correlation coefficients (Spearman's ρ). The analysis shows that, overall, JNDs improve with increasing call level and decrease with increasing number of calls per trial.