Abstract

Investigations concern sound detection and processing by fishes. The auditory system in fishes has a number of homologues with the auditory system in other vertebrates. Consequently, understanding functional aspects of hearing in fishes provides insight into general questions of vertebrate auditory system structural and functional relationships. Experimental investigations include measurement of hearing capabilities using operant conditioning techniques to determine hearing sensitivity and other psychophysical functions. Physiological studies are directed at understanding processing in the teleost ear and the roles of more peripheral structures, such as the swimbladder and Weberian ossicles, in sound detection and processing. Ancillary investigations include TEM and SEM studies of the ultrastructure and gross morphology of the ear in order to gain better insight into the functional anatomy of the ear in fishes. Studies are being conducted comparatively in order to ascertain when there is a 'typical' teleost auditory system or whether there are multiple mechanisms of detection and processing in fishes.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS015090-07
Application #
3395962
Study Section
Biopsychology Study Section (BPO)
Project Start
1978-09-01
Project End
1986-07-31
Budget Start
1984-12-01
Budget End
1986-07-31
Support Year
7
Fiscal Year
1985
Total Cost
Indirect Cost

  Institution

Name
Georgetown University
Department
Type
School of Medicine & Dentistry
DUNS #
049515844
City
Washington
State
DC
Country
United States
Zip Code
20057

  Publications

Wagner Jr, H N (1990) Merrill C. Sosman lecture. Drugs, behavior, and brain chemistry. AJR Am J Roentgenol 155:925-31
Presson, J C; Popper, A N (1990) A ganglionic source of new eighth nerve neurons in a post-embryonic fish. Hear Res 46:23-8
Webb, J F (1989) Gross morphology and evolution of the mechanoreceptive lateral-line system in teleost fishes. Brain Behav Evol 33:34-53
Webb, J F (1989) Neuromast morphology and lateral line trunk canal ontogeny in two species of cichlids: an SEM study. J Morphol 202:53-68
Rogers, P H; Popper, A N; Hastings, M C et al. (1988) Processing of acoustic signals in the auditory system of bony fish. J Acoust Soc Am 83:338-49
Saidel, W M (1988) Variations of trigger zones in vestibular afferent fibers of fish. Neurosci Lett 84:161-6
Saidel, W M (1987) An unusual optic fiber pattern in the retina of the primitive fish Pantodon buchholzi, Peters. Vision Res 27:511-6
Mathiesen, C; Popper, A N (1987) The ultrastructure and innervation of the ear of the gar, Lepisosteus osseus. J Morphol 194:129-42
Popper, A N; Hoxter, B (1987) Sensory and nonsensory ciliated cells in the ear of the sea lamprey, Petromyzon marinus. Brain Behav Evol 30:43-61
Saidel, W M; Popper, A N (1987) Sound reception in two anabantid fishes. Comp Biochem Physiol A Comp Physiol 88:37-44

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