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The mismatch negativity (MMN)--a unique window to disturbed central auditory processing in ageing and different
R Näätänen1, T Kujala, C Escera
1Institute of Psychology, University of Tartu, Tartu, Estonia, Finland. risto.naatanen@helsinki.fi
Abstract:
In this article, we review clinical research using the mismatch negativity (MMN), a change-detection response of the brain elicited even in the absence of attention or behavioural task. In these studies, the MMN was usually elicited by employing occasional frequency, duration or speech-sound changes in repetitive background stimulation while the patient was reading or watching videos. It was found that in a large number of different neuropsychiatric, neurological and neurodevelopmental disorders, as well as in normal ageing, the MMN amplitude was attenuated and peak latency prolonged. Besides indexing decreased discrimination accuracy, these effects may also reflect, depending on the specific stimulus paradigm used, decreased sensory-memory duration, abnormal perception or attention control or, most importantly, cognitive decline. In fact, MMN deficiency appears to index cognitive decline irrespective of the specific symptomatologies and aetiologies of the different disorders involved.
Insights
Mismatch negativity (MMN), a brain response to change, is often reduced in various disorders and aging. This MMN deficiency indicates cognitive decline across different conditions.
Area of Science:
- Neuroscience
- Cognitive Science
- Clinical Psychology
Background:
- Mismatch negativity (MMN) is a brain's automatic change-detection response.
- It can be elicited without attention or active task engagement.
- MMN is studied in various clinical populations and aging.
Purpose of the Study:
- To review clinical research utilizing MMN.
- To explore the significance of MMN alterations in disorders and aging.
- To determine if MMN deficiency reflects cognitive decline.
Main Methods:
- Review of clinical studies employing MMN paradigms.
- MMN elicited by infrequent changes (frequency, duration, speech) in background stimuli.
- Participants engaged in passive tasks (reading, watching videos).
Main Results:
- Reduced MMN amplitude and prolonged peak latency observed across numerous disorders (neuropsychiatric, neurological, neurodevelopmental) and normal aging.
- These MMN changes correlate with decreased discrimination accuracy, sensory memory, perception, and attention.
- MMN deficiency consistently indicates cognitive decline.
Conclusions:
- MMN alterations are sensitive indicators of cognitive impairment.
- MMN deficiency serves as a biomarker for cognitive decline, independent of specific disorder etiology or symptomatology.
- MMN research offers insights into neural mechanisms underlying cognitive deficits.
