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Brain function in the minimally conscious state: a quantitative neurophysiological study.

J Leon-Carrion¹, J F Martin-Rodriguez, J Damas-Lopez

¹Human Neuropsychology Laboratory, School of Psychology, Department of Experimental Psychology, C/Camilo José Cela s/n, University of Seville, Seville, Spain. leoncarrion@us.es

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology

|May 20, 2008

Summary

This summary is machine-generated.

Electroencephalography (EEG) revealed differences in brain activity between patients in a minimally conscious state (MCS) and those with severe neurocognitive disorders (SND). Increased slow-wave activity in MCS patients correlated with their level of awareness.

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Area of Science:

Neuroscience
Clinical Neurophysiology

Background:

Distinguishing between minimally conscious state (MCS) and severe neurocognitive disorders (SND) in brain-injured patients is challenging.
Both conditions may present with some signs of awareness, necessitating objective assessment methods.

Purpose of the Study:

To investigate electroencephalography (EEG) power spectrum and coherence differences between MCS and SND patients.
To identify distinct EEG cortical sources differentiating these two patient groups using LORETA analysis.

Main Methods:

Studied 16 patients with traumatic brain injury (7 MCS, 9 SND).
Compared resting-state EEG power spectra, coherence, and LORETA cortical sources between groups.

Main Results:

Significant differences in delta-band EEG power spectra were observed between MCS and SND patients.
MCS patients exhibited increased delta and theta frequency amplitudes in posterior cortical sources.
Lower source magnitudes in temporal and frontal lobes were noted for fast frequencies in MCS patients.

Conclusions:

Fronto-temporal-parietal associative cortices are crucial for awareness.
Excess slow-wave activity in brain-injured individuals may correlate with a diminished level of awareness.
Neurophysiological correlates can assess brain areas responsible for awareness in severely impaired patients.