Role of acoustic striae in hearing: discrimination of sound-source elevation
| Autor: | K. K. Glendenning, D.P Sutherland, R. B. Masterton |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Dorsal cochlear nucleus
Cochlear Nucleus medicine.medical_specialty Central nervous system Audiology Cochlear nucleus Pitch Discrimination Random Allocation Hearing otorhinolaryngologic diseases medicine Avoidance Learning Animals Sound (medical instrument) Stria Vascularis Auditory Threshold Sensory Systems Intermediate acoustic stria Electrophysiology Elevation (emotion) medicine.anatomical_structure Acoustic Stimulation Cats Dorsal acoustic stria Psychology Neuroscience |
| Zdroj: | Hearing research. 120(1-2) |
| ISSN: | 0378-5955 |
| Popis: | After years of systematic experimentation, we finally uncovered one thing the dorsal system contributes to hearing which the ventral system may not -- the mechanism for orienting to an elevated sound source [Sutherland, D.P., Masterton, R.B., Glendenning, K.K. (1998) Behav. Brain Res. in press]. This paper follows up this one positive result on a historical background of uniformly negative results. The focus of this report is on the fusiform cells of the dorsal cochlear nucleus whose axons course through the dorsal acoustic stria (DAS). Because electrophysiological studies have shown that the cues for sensing the elevation of a sound source would seem to be best analyzed by the dorsal cochlear nucleus, we tested, behaviorally, normal cats and cats deprived of their DAS or intermediate acoustic stria, bilaterally or ipsilaterally (with or without their contralateral ear deafened), for their ability to orient to elevated sources of broad-band noise. For behavioral testing, we made use of a conventional shock-avoidance procedure. The results lead to the conclusion that DCN and DAS may play no role in learned elevation discriminations. This result builds on that of another of our papers which suggests that a deficit in reflexive discrimination of elevation is strictly auditory in nature [Sutherland, D.P., Masterton, R.B., Glendenning, K.K. (1998) Behav. Brain Res. in press]. |
| Databáze: | OpenAIRE |
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