Tsunoda’s method : A new objective testing method available for the orientation of the dominant cerebral hemisphere towards various sounds and its clinical use

Ear differences and delayed auditory feedback: Effect on a simple verbal repetition task and a nonverbal tapping test.

“…The preceding experiments illustrate how Tsunoda's (1966) technique may be used to investigate various aspects of cerebral laterality. One might expect a priori that a method using DAF would be more sensitive than the more familiar dichotic procedures in investigating cerebral asymmetry in that it produces the obvious speech breakdown effect during the actual performance of the task and, unlike the dichotic technique, no short-term memory component may be implicated.…”

“…The delay time in these experiments is fixed at that interval producing maximum disruption and, since increasing the intensity of DAF produces increased speech disruption (Yates, 1963), a rather sensitive measure of hemispheric susceptibility to DAF is given by the DAF intensity at the speech breakdown point. Tsunoda (1966) has suggested that his method might be used as a psychological test of cerebral laterality for speech in individual cases. The present experiments suggest that, at least when words or tapping are used as tasks, the ear differences in individual cases are not sufficiently clear-cut to be of value in a clinical context.…”

“…In general, dichotic listening experiments have suggested that verbal auditory stimuli are interpreted in the left hemisphere (Haggard, 1971;Kimura, 1961;Kimura & Folb, 1968;Satz, 1968;Shankweiler & Studdert-Kennedy, 1967), and nonverbal sounds are perceived in the right hemisphere (Curry, 1967;Darwin, 1969;Kimura, 1964;Tsunoda, 1966).…”

“…ear at which DAF causes greater disruption of the task is contralateral to the hemisphere dominant for the task in question. The use of dichotic DAF and IAF to investigate cerebral asymmetry was first suggested by Tsunoda (1966) for a rhythmic tapping task. Tones triggered by the taps were fed immediately into one ear and after a delay into the other ear.…”