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Volume 17, Number 16,
Issue of August 15, 1997
pp. 6380-6390
Copyright ©1997 Society for Neuroscience
Bengalese Finches Lonchura Striata Domestica Depend
upon Auditory Feedback for the Maintenance of Adult Song
Received March 17, 1997; revised May 19, 1997; accepted May 27, 1997.
Sarah M. N. Woolley and
Edwin W Rubel
Neurobiology and Behavior Program and Virginia Merrill Bloedel
Hearing Research Center, University of Washington, Seattle, Washington
98195
Male birds of age-limited song-learning species develop their full
song repertoires in the first year of life. For this type of song
learner, once song is stabilized in adulthood, it is highly stereotyped
and stable over time. Traditionally, it has been believed that
age-limited song learners do not depend on auditory feedback for the
maintenance of adult song. A recent report, however, showed that adult
song in zebra finches, age-limited learners, does change after
long-term deafness. We report here that another species of age-limited
learner, Bengalese finches, depends critically on auditory feedback for
adult song maintenance. We surgically deafened adult males and recorded
song for 12 weeks after surgery. Results show that song degraded
significantly within 1 week of surgery and continued to degrade over
the next 11 weeks. This represents a more rapid degradation of song
than has been seen previously in age-limited species. Song deficits
after deafening included a marked decrease in syllable sequence
stereotypy, skewed syllable distribution within song bouts, degradation
of syllable phonology, and dropped, combined, and new or unrecognizable
syllables. Decreased sequence stereotypy and combined syllables
appeared within 1 week of deafening and did not worsen over time.
Skewed syllable distributions and syllable phonology changes appeared after 1 week and did worsen. Occurrences of dropped and new syllables appeared within 1 week and increased over time. Comparison with other
species indicates that much variability exists among species in the
extent to which auditory feedback is necessary for song maintenance.
Key words:
song;
auditory feedback;
deafening;
finch;
cochlear
removal;
song system
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