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Spatio-temporal EEG waves in first episode schizophrenia
- Source :
- Clinical Neurophysiology. 120:1667-1682
- Publication Year :
- 2009
- Publisher :
- Elsevier BV, 2009.
-
Abstract
- Objective Schizophrenia is characterized by a deficit in context processing, with physiological correlates of hypofrontality and reduced amplitude P3b event-related potentials. We hypothesized an additional physiological correlate: differences in the spatio-temporal dynamics of cortical activity along the anterior–posterior axis of the scalp. Methods This study assessed latency topographies of spatio-temporal waves under task conditions that elicit the P3b. EEG was recorded during separate auditory and visual tasks. Event-related spatio-temporal waves were quantified from scalp EEG of subjects with first episode schizophrenia (FES) and matched controls. Results The P3b-related task conditions elicited a peak in spatio-temporal waves in the delta band at a similar latency to the P3b event-related potential. Subjects with FES had fewer episodes of anterior to posterior waves in the 2–4 Hz band compared to controls. Within the FES group, a tendency for fewer episodes of anterior to posterior waves was associated with high Psychomotor Poverty symptom factor scores. Conclusions Subjects with FES had altered global EEG dynamics along the anterior–posterior axis during task conditions involving context update. Significance The directional nature of this finding and its association with Psychomotor Poverty suggest this result is related to findings of hypofrontality in schizophrenia.
- Subjects :
- Adult
Male
medicine.medical_specialty
Adolescent
Context (language use)
Hypofrontality
Electroencephalography
Audiology
Developmental psychology
Young Adult
Physiology (medical)
P3b
Reaction Time
medicine
Humans
Evoked Potentials
Psychiatric Status Rating Scales
medicine.diagnostic_test
medicine.disease
Sensory Systems
Frontal Lobe
Memory, Short-Term
medicine.anatomical_structure
Acoustic Stimulation
Delta Rhythm
Neurology
Frontal lobe
Schizophrenia
Data Interpretation, Statistical
Scalp
Female
Schizophrenic Psychology
Neurology (clinical)
Psychology
Psychomotor disorder
Photic Stimulation
Psychomotor Performance
Subjects
Details
- ISSN :
- 13882457
- Volume :
- 120
- Database :
- OpenAIRE
- Journal :
- Clinical Neurophysiology
- Accession number :
- edsair.doi.dedup.....a2b7578df8b95f610436010a24e83edc