Peripheral specialization for fine analysis of doppler-shifted echoes in the auditory system of the “CF-FM” bat Pteronotus parnellii

摘要: Pteronotus parnellii uses the second harmonic (61–62 kHz) of CF component in its orientation sounds for Doppler-shift compensation. The bat9s inner ear is mechanically specialized fine analysis at about 61–62 kHz. Because this specialization, cochlear microphonics (CM) evoked by kHz tone bursts exhibit prominent transients, slow increase and decrease amplitude onset cessation these stimuli. CM-responses to 60–61 show a input-output non-linearity transients. Accordingly, summated response primary auditory neurones (N1) appears not only stimuli, but also cessation. N1-off sharply tuned kHz, while N1-on 63–64 which 2 higher than best frequency system because envelope-distortion originating from sharp mechanical tuning. Single peripheral sensitive have an unusually tuning curve phase-locked responses beats up 3 Information frequencies Doppler-shifted echoes thus coded set discharges beats. Neurones with between 55 64 tonic on-responses off-responses are apparently related off-transient occuring rebound neural inhibition.