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Related Experiment Video

Updated: Aug 5, 2025

Assessment and Communication for People with Disorders of Consciousness

Assessment and Communication for People with Disorders of Consciousness

Published on: August 1, 2017

Tracking auditory mismatch negativity responses during full conscious state and coma.

Adianes Herrera-Diaz^1,2, Rober Boshra³, Paniz Tavakoli¹

¹Centre for Advanced Research in Experimental and Applied Linguistics (ARiEAL), McMaster University, Hamilton, ON, Canada.

Frontiers in Neurology

|March 27, 2023

Summary

This summary is machine-generated.

Mismatch negativity (MMN) reliably detects brain responses in healthy individuals over time. In comatose patients, MMN detectability fluctuates, underscoring the need for repeated assessments to predict coma emergence.

Keywords:

brain injury coma disorder of consciousness event-related potentials (ERP)mismatch negativity

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Area of Science:

Neuroscience
Clinical Neurophysiology

Background:

The mismatch negativity (MMN) is an electrophysiological brain response.
It reflects change detection and is valuable for monitoring consciousness after severe brain injury.

Purpose of the Study:

To investigate MMN detectability fluctuations over time in healthy controls and comatose patients.
To determine if MMN fluctuations are characteristic of full consciousness or coma.

Main Methods:

Auditory multi-deviant oddball paradigm.
Tracking MMN responses in 17 healthy controls (12-h) and 3 comatose patients (24-h).
Analysis using visual inspection, permutation t-test, and Bayesian analysis.

Main Results:

MMN responses to duration deviants were reliably detected in healthy controls over hours at group and single-subject levels.
Preliminary findings in comatose patients showed MMN presence, with detectability varying from easily detectable to undetectable over time.
MMN fluctuations were observed in comatose patients, suggesting variability within individuals.

Conclusions:

MMN responses are stable over time in healthy individuals.
MMN detectability can fluctuate in comatose patients, highlighting the importance of repeated assessments.
Regular MMN assessments are crucial for predicting coma emergence.