mismatch negativity
A neurophysiological response measured in functional neuroimaging studies of auditory processing.
Full Definition
Mismatch negativity (MMN) is an event-related potential component that occurs when the brain detects a deviant stimulus in a sequence of standard stimuli, reflecting pre-attentive auditory discrimination. In neuroimaging contexts, MMN paradigms are used in functional MRI studies to assess auditory processing capabilities and can be particularly valuable in evaluating patients with cognitive impairment, psychiatric disorders, or language processing deficits. The response typically peaks around 100-200 milliseconds after stimulus onset and involves temporal and frontal brain regions.
Usage
Usage note: Primarily used in research contexts; specify paradigm details when relevant.
In Context
- "The fMRI study utilized a mismatch negativity paradigm to assess auditory discrimination." — Functional imaging protocol
- "Reduced mismatch negativity response was observed in the patient group compared to controls." — Research study report