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Preserved Feedforward But Impaired Top-Down Processes in the Vegetative State
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Preserved Feedforward But Impaired Top-Down Processes in the Vegetative State
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Journal Article
Preserved Feedforward But Impaired Top-Down Processes in the Vegetative State
2011
Overview
Frontoparietal cortex is involved in the explicit processing (awareness) of stimuli. Frontoparietal activation has also been found in studies of subliminal stimulus processing. We hypothesized that an impairment of top-down processes, involved in recurrent neuronal message-passing and the generation of long-latency electrophysiological responses, might provide a more reliable correlate of consciousness in severely brain-damaged patients, than frontoparietal responses. We measured effective connectivity during a mismatch negativity paradigm and found that the only significant difference between patients in a vegetative state and controls was an impairment of backward connectivity from frontal to temporal cortices. This result emphasizes the importance of top-down projections in recurrent processing that involve high-order associative cortices for conscious perception.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Adult
/ Aged
/ Biological and medical sciences
/ cortex
/ Female
/ Frontal Lobe - physiopathology
/ Frontal Lobe/physiology/physiopathology
/ Fundamental and applied biological sciences. Psychology
/ Humans
/ Male
/ Neurons
/ Parietal Lobe - physiopathology
/ Parietal Lobe/physiology/physiopathology
/ Patients
/ Persistent Vegetative State - diagnosis
/ Persistent Vegetative State - physiopathology
/ Persistent Vegetative State/diagnosis/physiopathology
/ Persistent vegetative states
/ Scalp
/ Sciences de la santé humaine
/ Sleep
/ Stimuli
/ Temporal Lobe - physiopathology
/ Temporal Lobe/physiology/physiopathology
