Details

Autor(en) / Beteiligte

• Popov, Vladimir V.
• Supin, Alexander Ya
• Wang, Ding
• Wang, Kexiong

Titel

Nonconstant quality of auditory filters in the porpoises, Phocoena phocoena and Neophocaena phocaenoides (Cetacea, Phocoenidae)

Ist Teil von

• The Journal of the Acoustical Society of America, 2006-05, Vol.119 (5), p.3173-3180

Ort / Verlag

Woodbury, NY: Acoustical Society of America

Erscheinungsjahr

2006

Quelle

AIP Journals Complete

Beschreibungen/Notizen

• Simultaneous tone-tone masking in conjunction with the envelope-following response (EFR) recording was used to obtain tuning curves in porpoises Phocoena phocoena and Neophocaena phocaenoides asiaeorientalis . The EFR was evoked by amplitude-modulated probes with a modulation rate of 1000 Hz and carrier frequencies from 22.5 to 140 kHz . Equivalent rectangular quality Q ERB of the obtained tuning curves varied from 8.3-8.6 at lower (22.5- 32 kHz ) probe frequencies to 44.8-47.4 at high (128- 140 kHz ) frequencies. The Q ERB dependence on probe frequency could be approximated by regression lines with a slope of 0.83 to 0.86 in log-log scale, which corresponded to almost frequency-proportional quality and almost constant bandwidth of 3- 4 kHz . Thus, the frequency representation in the porpoise auditory system is much closer to a constant-bandwidth rather that to a constant-quality manner.