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Thesis (Ph. D.)--University of Texas at Austin, 2003. / Vita. Includes bibliographical references. Available also from UMI Company.

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When a formant transition (isolated transition) and the remainder (base) of a synthesized syllable are presented to opposite ears most subjects perceive two simultaneous sounds, a syllable and a nonspeech chirp. The isolated transition determines the identity of the syllable at one ear and, at the same time, is perceived as a chirp at the opposite ear. This phenomenon, called duplex perception, has been interpreted as the result of the independent operation of two perceptual modes, the phonetic and the auditory mode. In order to test this hypothesis, the isolated transition was preceded and followed by a series of identical transitions sent to the same ear. This streaming procedure weakened the contribution of the transition to the perceived phonetic identity of the syllable. This weakening effect could have been explained in terms of the habituation of an hypothetical phonetic feature detector sensitive to the repetition of identical transitions. For this reason, the same effect was replicated by capturing the isolated transition with others which were aligned on the same frequency-by-time trajectory as the isolated one. These findings are consistent with the idea that the integration of the transition with the base was affected by the operation of general-purpose auditory processes. This contrasts with the hypothesis that the phonetic mode integrated the dichotic stimuli independently of the auditory mode.

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This thesis investigated melodic memory and perception in patients with unilateral left (LT) or right (RT) temporal-lobe lesions and in normal control (NC) subjects. Experiment I examined learning and 24-hour retention of unfamiliar tunes and nonsense words. Both temporal-lobe groups were impaired in learning the tunes and the words. Long-term retention of these stimuli showed that subjects with a RT lobectomy were more impaired in recognizing the tunes than the words, while subjects with a LT lobectomy were more impaired in recognizing the words than the tunes. This study demonstrated the differenting roles of the right and the left temporal lobes in long-term retention of musical and verbal information, respectively. Experiment IIa and IIb investigated memory for songs (words sung to a tune). Recognition of the melodic component resulted in a deficit for both RT and LT groups, but the nature of the impairment seems to be related to the side of the lesion. Patients with LT lobectomy showed deficits in tune recognition mediated by words, but not for tunes sung without words. Patients with RT lobectomy were impaired in tune recognition, whether or not words were sung to the tunes. On the other hand, the well-known verbal memory deficit was shown after a LT lobectomy when the words actually form part of the stimulus as well as when the words are spoken. In experiment III two melodic discrimination tasks were created to test the hypothesis that the RT and the LT lobes are specialized for global and local information processing, respectively. The results showed that impairments under both experimental conditions regardless of the side of the temporal lobectomy suggest that the two temporal lobes are involved in the processing of contour and interval information.

No description available.

Thesis (M.A.)--State University of New York at Binghamton, Dept. of Psychology, 2007. / Includes bibliographical references.