FIG. 1.

Compiled adult SFOAE data for both Gekko and Hemidactylus, evoked using a stimulus level of L_p = 20 dB SPL. Top plots show magnitude and phase (error bars of individual curves excluded for clarity, different individuals are shown via different shading intensities). Average magnitudes (and associated standard error) within octave-wide bins are indicated via the red square symbols (See “Methods”). Approximate noise floor is indicated via the dashed black line. Dashed red line for the phase indicates the N_SFOAEloess trend integrated with respect to frequency, thereby providing the “average” phase response for visual comparison. Some phase curves have been offset vertically for clarity. Bottom plot (N_SFOAE) indicates the phase-gradient delay (in cycles) as computed from the phase response. Only points whose magnitude was at least 10 dB above the noise floor were included. Solid line for N_SFOAE plot is a locally weighted regression (loess) while solid black lines indicate the associated 95% confidence interval (see “Methods”). The total number of unique ears is indicated in the upper left corner of the N_SFOAE plots. All data were obtained with lizards at a steady-state body temperature of ~32–33°C via a regulated heating pad. Other stimulus parameters used: L_s = 35 dB SPL, f_s = f_p + 40 Hz.