Brain, Vol. 123, No. 1, 155-163,
January 2000
© 2000 Oxford University Press
Functional specificity in the right human auditory cortex for perceiving pitch direction
1 Wellcome Department of Cognitive Neurology, Institute of Neurology, London, UK, 2 Neuropsychology/Cognitive Neuroscience Unit, Montreal Neurological Institute, McGill University, Montreal, Canada
Correspondence to:
Ingrid S. Johnsrude, Wellcome Department of Cognitive Neurology, Institute of Neurology, 12 Queen Square, London WC1N 3BG, UK E-mail: ingrid{at}fil.ion.ucl.ac.uk
Previous lesion and functional imaging studies in humans suggest a greater involvement of right rather than left auditory cortical areas in certain aspects of pitch processing. In the present study, adaptive psychophysical procedures were used to determine auditory perceptual thresholds in 14 neurologically normal subjects, and in 31 patients who had undergone surgical resection from either the right or left temporal lobe for the relief of intractable epilepsy. In a subset of the patients, the lesion encroached significantly upon the gyrus of Heschl or its underlying white matter as determined from MRI analysis. Subjects were asked to perform two different perceptual tasks on the same set of stimuli. In a pitch discrimination task, the subject had to decide whether two elements of a pure tone pair were the same or different. In a task requiring the judgement of direction of pitch change, subjects decided whether pitch rose or fell from the first tone to the second. Thresholds were determined by measuring the minimum pitch difference required for correct task performance. Mean thresholds in the pitch discrimination task did not differ between patient groups and control subjects. In contrast, patients with temporal lobe excisions that encroached upon the gyrus of Heschl in the right hemisphere (but not in the left) showed significantly elevated thresholds when judging the direction of pitch change. These findings support a specialization of function linked to right auditory cortical areas for the processing of pitch direction, and specifically suggest a dissociation between simple sensory discrimination and higher order perception.
auditory cortex; hearing; hemispheric specialization; music; pitch
HG = first transverse gyrus of Heschl; LTa/RTa = small removal from auditory regions from left or right hemisphere, respectively; LTA/RTA = large removal from auditory regions from left or right hemisphere, respectively
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