Functional brain asymmetry and monaural stimulation

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dc.contributor.authorHaydon, Shane P.en_US
dc.date.accessioned2024-08-14T16:44:46Z
dc.date.available2024-08-14T16:44:46Z
dc.date.copyright1972en_US
dc.date.issued1972
dc.degree.departmentDepartment of Psychology
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractForty-eight right-handed female college students were presented with diotic or monaural auditory stimuli in each of three different conditions. The dependent variable was key press reaction time (RT) to sound onset. The three stimulus conditions were; (a) a single lOOOHz tone (T), (b) one of three different tones 980, 1000, and 1020 Hz (CT), (c) one of six spoken CVC nonsense words (L). Subjects were assigned to one of two presentation groups, directed presentation (DP) in which Ss were told which ear was to be stimulated, and random presentation (RP) in which the ear of presentation was random and Ss had no foreknowledge. Within each presentation condition Ss were divided into two report groups, report (Rep) in which Ss were required to identify the stimulus in addition to key press to stimulus onset, and (N Rep) in which Ss did not identify the stimulus. Each S received 24 trials to the left, right, and to both ears. The DP group, when not required to report, showed no RT difference as a function of ear stimulated in any of the three stimulus conditions. When required to report, diotic RTs were significantly faster than monaural RTs in the T sound condition, Both Rep and N Rep Ss using their right hand in the RP group showed right ear RTs significantly faster than those for the left ear in the T and L sound conditions. Stimulus report attenuated RTs only for the DP group. Subjects who could selectively attend, i.e., determine for themselves to which ear they would listen, had faster RTs than DP Ss. These data show that stimulus competition is not a necessary condition for the demonstration of auditory asymmetry. A perceptual model is proposed which states that auditory asymmetry under either dichotic or monaural conditions is a function of selective attention. In the absence of specific instructions attention to one ear or the other may be determined by the nature of the stimulation. Assuming that contralateral auditory afferent pathways are more efficient than the ipsilateral pathways, superior right ear RTs imply that perception is occurring in the left hemisphere. Right ear superiority for both language sounds as well as non-language sounds supports the concept of a single active hemisphere in auditory perception.en
dc.format.extent131 pages
dc.identifier.urihttps://hdl.handle.net/1828/18087
dc.rightsAvailable to the World Wide Weben_US
dc.titleFunctional brain asymmetry and monaural stimulationen_US
dc.typeThesisen_US

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