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Event-related potentials were recorded during the presentation of a series of standard and deviant auditory stimuli (1000Hz, 870ms SOA), and mismatch negativity (MMN) was extracted to investigate pre-attentive deviant detection processes. In experiment1, the standard was a continuous tone(170ms). The two deviant stimuli(0.1 probability each) consisted of two discrete tones(50ms) separated by a gap(70ms) or a single tone(50ms).In experiment 2, the roles of the standard and deviant stimuli were reversed. The standard consisted of two discrete tones separated by a gap and either a 170ms or a50ms single tone was used as deviant. MMN latencies in experiment 2 were longer than those in experiment 1, inconsistent with the idea that an exact memory trace is created from stimulus repetition. Additionally, differences from the standard in the latter half of the deviant stimulus were not reflected in MMN. These results suggest the existence of multiple strategies in deviant detection as well as a shorter temporal window of integration than previously hypothesized. (Japanese Journal of Physiological Psychology and Psychophysiology, 25(3) : 227-235, 2007.)

Flexibility of auditory deviant detection process reflected in MMN responses