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Figure 9 Sound-evoked event-related potential (ERP) and AEF are sensitive to unexpected changes in the sound and to shifts of the listener's attention. (Top) ERPs obtained when the same sound was repeated many times (frequent) and when that stream of repeated sound was interrupted occasionally by a different (rare) sound [adapted with permission from Kraus, N., and McGee, T., The Mammalian Auditory Pathway: Neuroanatomy (A. N. Popper and R. R. Fay Eds.). Springer-Verlag, New York, 1992]. (Bottom) The auditory-evoked magnetic field (AEF) obtained when listener attended (counting stimuli) or did not attend (reading) to the stimulus (adapted with permission from Hari, R., Adv. Audiol. 6, 222-282, 1990). The main effect of both activities was seen in the late waves, beyond the 100-msec component.

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