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The processing of sound duration after left hemisphere stroke: Event-related potential and behavioral evidence

Published online by Cambridge University Press:  06 July 2001

T.-M. ILVONEN
Affiliation:
Cognitive Brain Research Unit, Department of Psychology, University of Helsinki, Finland
T. KUJALA
Affiliation:
Cognitive Brain Research Unit, Department of Psychology, University of Helsinki, Finland
M. TERVANIEMI
Affiliation:
Cognitive Brain Research Unit, Department of Psychology, University of Helsinki, Finland
O. SALONEN
Affiliation:
Department of Radiology, Helsinki University Central Hospital, Finland
R. NÄÄTÄNEN
Affiliation:
Cognitive Brain Research Unit, Department of Psychology, University of Helsinki, Finland BioMag laboratory, Helsinki University Central Hospital, Finland
E. PEKKONEN
Affiliation:
Cognitive Brain Research Unit, Department of Psychology, University of Helsinki, Finland BioMag laboratory, Helsinki University Central Hospital, Finland Department of Neurology, Helsinki University Central Hospital, Finland
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Abstract

The ability of left-hemisphere stroke patients (n = 8) and healthy control subjects (n = 8) to process sounds preattentively and attentively was studied by recording auditory event-related potentials (ERPs) and behavioral responses. For the right-ear stimulation, the mismatch negativity (MMN) was significantly smaller in the patients than control subjects over both hemispheres. For the left-ear stimuli, the MMN was significantly smaller in the patient group than in the control group over the left hemisphere, whereas no group differences were obtained over the right hemisphere. In addition, the N1 amplitude was reduced bilaterally for the right-ear stimulation (with the reduction being larger over the left hemisphere), whereas no significant effects on the N1 amplitude were found for the left-ear stimulation. Behaviorally, the patients detected significantly fewer deviant tones than did the control subjects irrespective of the stimulated ear. The present results thus suggest that the long-latency ERPs can be used to probe such auditory processing deficits that are difficult to define with behavioral measures. Especially by recording MMN to monaural stimuli, the discrimination accuracy can be separately determined for the left and right temporal lobes.

Type
Research Article
Copyright
2001 Society for Psychophysiological Research

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