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Translational Brain Mapping at the University of Rochester Medical Center: Preserving the Mind Through Personalized Brain Mapping

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Published on: August 12, 2019

Low-level language processing in brain-injured patients.

Parul Jain¹, Mary M Conte², Henning U Voss^3,4

¹Weill Cornell Graduate School of Medical Sciences, New York, NY 10065, USA.

Brain Communications

|April 14, 2023

Summary

This summary is machine-generated.

New passive EEG tests assess language processing in brain-injured patients. Both methods distinguished patients with and without command-following abilities, showing a more prominent early bilateral response in those with command-following.

Keywords:

disorders of consciousness phoneme speech envelope

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Area of Science:

Neuroscience
Cognitive Science
Neurology

Background:

Assessing cognitive function, particularly language processing, is crucial for severely brain-injured patients.
Existing methods like motor imagery tasks require sustained attention, which may be challenging for these patients.
Passive listening tasks using EEG can reduce motor and attentional demands, offering a more accessible approach.

Purpose of the Study:

To develop and validate two novel passive EEG-based assays for assessing low-level language processing in severely brain-injured individuals.
To differentiate between patients with and without evidence of language processing or command-following abilities.
To investigate the utility of these assays in patients with disorders of consciousness.

Main Methods:

A cross-sectional study involving 26 severely brain-injured patients and 10 healthy controls.
Two passive EEG assays were employed: identification of differential phoneme-class responses and tracking of the natural speech envelope.
EEG data were recorded while participants listened to an audiobook; patient function was assessed using the Coma Recovery Scale-Revised and motor imagery tests.

Main Results:

Both differential phoneme-class response and natural speech envelope tracking were present in all patient subjects.
Healthy controls showed temporally similar but spatially distinct responses between the two measures.
Patient subjects with evidence of language processing exhibited a more prominent early bilateral EEG response (within 50-100ms) compared to those without such evidence.

Conclusions:

Two passive EEG methods were successfully developed to assess low-level language processing in severely brain-injured patients.
These assays effectively distinguished between patients with and without evidence of command-following.
The findings highlight the potential of passive listening EEG paradigms for evaluating cognitive function in challenging patient populations.