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Auditory evoked response and mismatch negativity potential have been studied using the reversed oddball paradigm of standard and deviant stimulus presentation. In the experiments, three types of spatial sound stimuli (stationary and moving gradually or abruptly from the head midline) were presented in three configurations. In each configuration, one stimulus type served as the standard one, and the other two, as deviants. The reversal of the configuration of the presentation of the standard and deviant stimuli was shown to significantly influence the evoked response and mismatch negativity. The results are discussed as possible evidence of the categorical perception of auditory motion at early stages of sound processing in the hearing system.

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