Pitch perception in acoustic and electric hearing: Hunting down the missing fundamentals
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23 October 2017
Presenter(s): Bob Carlyon
Time: 13.00 -14.00
Location: NHBRU, Meeting Room 1
Pitch perception is important not only for the enjoyment of music and for the perception of prosody in speech, but also for our ability to process one sound, such as a voice, in the presence of competing sounds. Poor pitch perception, and the resulting difficulties when listening in noisy situations, are a common source of disability in deaf patients whose hearing has been restored by a cochlear implant (CI). I will summarise some experiments that address the following questions; (i) What aspects of the auditory-nerve response to sound are crucial for good pitch perception by normal hearing (NH) listeners? (ii) What is the biological basis for the severe limitations in pitch perception experienced by CI users? (iii) Are these limits fixed, or can they be partially overcome by the chronic electrical stimulation that occurs in the months following activation of a patient’s CI?, (iv) can pitch perception by CI users be improved by a drug that modulated fast-acting potassium channels? The experiments involve a combination of NH psychoacoustics, investigation of an illusory percept, CI psychophysics, electrophysiological recordings, and the results of a double-blind placebo-controlled drug trial. I will also briefly describe other experiments from our lab that aim to improve hearing by CI listeners
Bob Carlyon has been studying the human auditory system since his Ph.D. in Cambridge in the early 1980s. He is currently Deputy Director at the MRC Cognition & Brain Sciences Unit in Cambridge. He is also an Official Fellow of Clare Hall Cambridge. He was presented with the Acoustical Society of America's R. Bruce Lindsay award in 1994, and was elected a Fellow of that Society in 1998. He received the Thomas Simm Littler prize from the British Society of Audiology in 2010. Bob studies a wide range of topics in human hearing, a recurring theme being the problem of how we can listen to one voice in the presence of interfering sounds, such as other speakers. Much of his current research addresses how to improve hearing by cochlear implant users.