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Perceptual asymmetry has been demonstrated behaviorally using frequency modulated (FM) stimuli: a modulated tone is easier to detect among unmodulated distracters than the converse. We demonstrate perceptual asymmetry for FM tones in the mismatch negativity (MMN) component of the event-related potential, regardless of whether the participant attends to the tones. These results suggest that perceptual asymmetry reflects the automatic activation of low-level feature detectors in the auditory system.

Original publication




Journal article


Brain Res Cogn Brain Res

Publication Date





177 - 179


Acoustic Stimulation, Adult, Attention, Auditory Cortex, Contingent Negative Variation, Dose-Response Relationship, Radiation, Electroencephalography, Evoked Potentials, Auditory, Female, Humans, Male, Pitch Discrimination, Reaction Time, Time Factors