Related Experiment Video
Updated: Jun 28, 2026
07:37
Assessment and Communication for People with Disorders of Consciousness
Published on: August 1, 2017
Voluntary brain processing in disorders of consciousness
C Schnakers1, F Perrin, M Schabus
1Coma Science Group, Centre de Recherches du Cyclotron, Sart Tilman, B30, University of Liège, 4000 Liège, Belgium. C.Schnakers@student.ulg.ac.be
Neurology
|November 13, 2008
Summary
This study introduces an active evoked-related potentials paradigm to detect voluntary brain activity in patients with disorders of consciousness. This method successfully differentiated minimally conscious state (MCS) from vegetative state (VS) patients, even those with minimal behavioral signs.
Area of Science:
- Neuroscience
- Clinical Neurology
- Cognitive Science
Background:
- Distinguishing vegetative state (VS) from minimally conscious state (MCS) is challenging using behavioral observation alone.
- Existing diagnostic methods for disorders of consciousness (DoC) have limitations in detecting subtle signs of awareness.
- Objective measures are needed to identify voluntary brain activity in patients with severe brain damage.
Purpose of the Study:
- To explore a novel active evoked-related potentials (ERP) paradigm for detecting voluntary brain activity.
- To assess the efficacy of this paradigm in differentiating between VS and MCS patients.
- To investigate ERP responses in patients with disorders of consciousness, particularly those with limited behavioral indicators.
Main Methods:
- Twenty-two patients (8 VS, 14 MCS) and controls underwent an active ERP paradigm.
- Participants were presented with sequences of names in passive and active conditions.
- In the active condition, participants were instructed to count specific target names (own name or other names).
Main Results:
- Minimally conscious state patients exhibited a larger P3 response to their own name in both passive and active conditions, unlike VS patients.
- P3 responses to target stimuli were significantly higher in the active condition compared to the passive condition for MCS patients and controls, indicating task compliance.
- These active ERP responses were observed even in patients with minimal behavioral signs, such as visual fixation and pursuit.
Conclusions:
- Active evoked-related potentials paradigms can detect voluntary brain function in patients with severe brain damage and disorders of consciousness.
- This method shows promise for identifying awareness in patients with limited or questionable behavioral signs of consciousness.
- The active ERP paradigm offers a valuable tool for improving the diagnosis and management of patients with disorders of consciousness.
More Related Videos
08:25Combined Invasive Subcortical and Non-invasive Surface Neurophysiological Recordings for the Assessment of Cognitive and Emotional Functions in Humans
Published on: May 19, 2016
04:04Transauricular Vagus Nerve Stimulation and Electroencephalographic Assessment in Disorders of Consciousness
Published on: July 11, 2025
Related Concept Videos
01:15Subconsciousness and No Awareness
The concept of subconscious awareness refers to the processing of information below the level of conscious thought, which significantly influences both behaviors and decisions. It is also known as waking subconscious awareness. This complex level of cognition operates without the direct awareness of the individual, facilitating rapid and simultaneous handling of multiple information streams.
An illustrative example of subconscious processing is its role in problem-solving. Often, individuals...
An illustrative example of subconscious processing is its role in problem-solving. Often, individuals...
01:19High-Level and Low-Level Awareness
Controlled processes in human consciousness represent high-alert mental states where individuals deliberately focus their attention on achieving specific goals. Controlled processes can be seen in situations like mastering new technology, where a person might become so absorbed that they ignore surrounding distractions. Such processes involve selective attention, requiring one to concentrate on particular elements of experience while disregarding others. These are governed by executive...
01:30Organization of the Brain
The brain is an integral component of the nervous system and serves as the center for processing sensory inputs, making decisions, and directing bodily actions. This complex organ is organized into three primary sections: the hindbrain, midbrain, and forebrain, each responsible for a range of vital functions.
Hindbrain
The hindbrain, located at the base of the brain, plays a vital role in regulating automatic processes that sustain life. It includes the medulla oblongata, which is essential for...
Hindbrain
The hindbrain, located at the base of the brain, plays a vital role in regulating automatic processes that sustain life. It includes the medulla oblongata, which is essential for...
01:20Parallel Processing
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
01:23Understanding Consciousness
Consciousness can be defined as the state of being aware of and able to think about one's existence, sensations, and surroundings. It encompasses two major components: awareness and arousal. Awareness pertains to the recognition of environmental stimuli and internal states. At the same time, arousal refers to the physiological readiness to engage with these stimuli, which varies significantly between states like sleep and wakefulness.
Sleep, a crucial state, is characterized by reduced physical...
Sleep, a crucial state, is characterized by reduced physical...
01:13Functional Brain Systems: Reticular Formation
The reticular formation is a complex network of gray and white matter located within the brainstem extending from the medulla to the midbrain.
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...
Within the reticular formation, there are several distinct nuclei that can be classified into three broad categories. The Raphe nuclei are located along the midline of the brainstem. They are primarily known for their role in synthesizing and releasing serotonin, a neurotransmitter involved in regulating mood, appetite, sleep, and circadian rhythms. The...