Fig. 2.

Behavioral data for the gap-detection task. Single-participant hit rates as a function of FM stimulus phase for four exemplary listeners (Upper Left), shown separately for the rising (magenta) and falling (cyan) AM stimulus phases. All listeners showed quasi-periodic modulation of behavior by FM stimulus phase, as indicated by significant circular–linear correlations, for both AM stimulus phases (Upper Right; error bars indicate SEM). Asterisks denote significance at P ≤ 0.005. The periodicity present in the behavioral modulation was specific to the FM rate (3.1 Hz) and its harmonic (6.2 Hz; Lower).