Examining spatial resolution, stimulus perception and relative contributions of the octavolateralis sub-systems of the goldfish (Carassius auratus)
Item
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Title
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Examining spatial resolution, stimulus perception and relative contributions of the octavolateralis sub-systems of the goldfish (Carassius auratus)
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Identifier
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d_2009_2013:fe266168df8c:10431
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identifier
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10497
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Creator
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Dailey, Deena D.,
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Contributor
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Christopher B. Braun
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Date
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2010
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Language
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English
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Publisher
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City University of New York.
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Subject
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Behavioral psychology | Psychobiology | audition | dipole detection | goldfish | lateral line | octave generalization | sonic detection
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Abstract
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In two separate series of behavioral experiments, spatial resolution and perceptual dimensions corresponding to physical stimulus attributes (frequency, amplitude and position) of a vibratory dipole source were assessed using classically conditioned respiratory suppression in goldfish ( Carassius auratus). In study 1 detection thresholds (at 40 Hz) were compared across distances of 1.5--24 cm, before and after ablation of individual octavolateralis sensory channels. Detection thresholds, expressed in units of pressure (SPL), remained roughly constant as distance between the stimulus source and animal increased by four distance doublings. Lateral line inactivation, using CoCl2, had no measurable effect on sensitivity, although some other results can be construed as weak evidence for a small contribution of the lateral line to dipole detection when source distances are ≤ 6 cm (< 1 body length). Gas bladder deflation resulted in a large increase in threshold (17 dB), demonstrating that the inner ear alone is capable of detecting a low frequency vibratory source without the benefit of pressure detection enhancement and that the gas bladder contributes to audition at a lower frequency limit than previously predicted. Study 1 confirms an auditory role for the gas bladder enhanced inner ear of goldfish in the detection of a low frequency (40Hz) vibratory source. Sonic audition (detection of pressure fluctuations) appears to be the dominant mode of dipole-source detection for goldfish when measured by conditioned behaviors in psychophysical experiments.;In study 2 behavioral measures of generalization to a vibratory stimulus were obtained for frequency, stimulus amplitude and position in the goldfish. Goldfish completely failed to generalize to octave interval changes in frequency, both lesser and greater than the CS. However, they did appear to generalize weakly to a loudspeaker stimulus of the same frequency (40 Hz) and repetition rate as the CS. Animals also generalized to the vibratory source presented at a range of source positions. As source distance increased, animals appeared to generalize more broadly to changes in position. Goldfish also appeared to generalize to stimulus amplitude. Response decrements, between amplitude test stimuli and the CS, ranged between 10-40% but were not statistically different.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Psychology
