Figure 1.

Low-level SFOAE magnitude and phase (φ_OAE) for three representative individuals from each of three species chosen to highlight differences in TM morphology. (Top) Non-TM (Anolis); (middle) sallets (Gerrhosaurus); (bottom) continuous TM (Aspidoscelis). A guiding schematic is included. (Shading) Presence of the TM. (Arrows) Bundle polarization (direction from shortest to tallest villi) for radially clustered groups of hair cells (note the variability in orientation for Aspidoscelis). Different individuals are illustrated by different line shadings. SFOAE magnitude and phase (φ_OAE) were evoked using a 20 dB SPL tone. Error bars have been excluded for clarity (see Supporting Material). Stimulus conditions and steady-state body temperatures (∼32–33°C) were identical for all curves. (Dashed-dotted line) Approximate noise floor.