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Cognitive brain potentials in children at risk for schizophrenia: preliminary findings
Insights
Children at genetic risk for schizophrenia showed reduced brain responses to auditory stimuli. This may indicate a premorbid indicator for psychosis development in high-risk youth.
Area of Science:
- Neuroscience
- Psychiatry
- Developmental Psychology
Background:
- Schizophrenia is a complex disorder with potential genetic predispositions.
- Early identification of risk factors is crucial for understanding disease development.
- Event-related potentials (ERPs) offer insights into neural processing in at-risk populations.
Purpose of the Study:
- To investigate event-related brain potentials (ERPs) in children at high risk for schizophrenia.
- To compare ERPs between high-risk (HR) children and normal control (NC) children.
- To determine if ERP differences could serve as a premorbid indicator for psychosis.
Main Methods:
- Recorded ERPs in response to auditory stimuli in two independent longitudinal samples.
- Subjects performed a detection task involving infrequent pitch changes or missing stimuli.
- Compared late positive amplitude (P350, P400) between HR and NC children during relevant event detection.
Main Results:
- High-risk (HR) children exhibited significantly reduced late positive amplitude (P350 and P400) compared to normal control (NC) children.
- This amplitude reduction was observed specifically when the auditory event was relevant.
- Reaction times and their variability were similar between HR and NC groups, suggesting the ERP difference is not due to motor response variations.
Conclusions:
- Reduced late positive component amplitude in ERPs may be a premorbid indicator of psychosis risk in children.
- These findings align with previous research on adult schizophrenic waveforms.
- Early neurophysiological markers could aid in identifying individuals at genetic risk for schizophrenia.
Abstract:
Event-related brain potentials were recorded to auditory stimuli from children at risk for schizophrenia and normal control children who were part of two independent samples being followed longitudinally. Subjects were required to detect (with a reaction time response) one of two infrequent events (either a pitch change or a missing stimulus), each of which occurred 17 percent of the time, and was embedded in a sequence of frequent events occurring 66 percent of the time. The event-related potential (ERP) elicited by both infrequent stimuli consisted of a positive-going wave peaking at 350 msec for the pitch change ERP (P350) and 400 msec for the missing stimulus ERP (P400) and a slow wave, which overlapped with and extended beyond the P350 and P400 potentials. When the eliciting event was relevant, these potentials were significantly larger than when it was irrelevant. When the waveforms by the highrisk (HR) subjects were compared to those produced by the normal control (NC) subjects, the HR subjects of both samples showed significantly less late positive amplitude (P350 and P400) than the NC subjects, but only when the eliciting event was relevant. This effect appeared to be independent of reaction time, as reaction time means and variances were quite similar between risk groups. Other possible explanations for this amplitude reduction were explored. Since late positive component amplitude reduction has been consistently reported to characterize the waveforms of adult schizophrenics, the reduction seen in children at genetic risk for schizophrenia may be a premorbid indicator for the development of the psychosis.