Disturbances in time estimation during absence seizures in children
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E L van Luijtelaar1, S F de Bruijn, A C Declerck
1Department of Psychology, University of Nijmegen, The Netherlands.
Insights
Children with absence epilepsy showed altered time estimation during EEG monitoring. Spike wave discharges impacted their performance, indicating sensitivity to cognitive disturbances.
Area of Science:
- Neuroscience
- Epilepsy Research
- Cognitive Psychology
Background:
- Primary generalized absence epilepsy is characterized by brief episodes of impaired awareness.
- Cognitive functions, including time estimation, may be affected by epileptic activity.
- Electroencephalography (EEG) monitoring is crucial for diagnosing and understanding epilepsy.
Purpose of the Study:
- To investigate the impact of spike-wave discharges on time estimation accuracy in children with absence epilepsy.
- To assess the sensitivity of a time estimation task in detecting cognitive disturbances associated with epileptic activity.
Main Methods:
- Children with absence epilepsy performed a time estimation task under continuous EEG monitoring.
- Participants pressed a button to indicate perceived elapsed time intervals.
- Post-reinforcement pause duration served as an index of time estimation accuracy, compared during trials with and without spike-wave discharges.
Main Results:
- Short spike-wave discharges (<3s) prolonged the post-reinforcement pause, indicating impaired time estimation.
- Longer spike-wave discharges reduced the post-reinforcement pause, with a shorter interval between discharge end and response.
- The observed effects suggest cognitive disturbances are detectable even without overt clinical seizures.
Conclusions:
- The time estimation task is sensitive to cognitive impairments induced by both short and long spike-wave discharges in absence epilepsy.
- Patients' behavior post-discharge suggests differential impact, with longer discharges potentially causing more severe disturbances.
- This task offers a valuable tool for assessing subtle cognitive deficits in epilepsy.
Abstract:
In the present study children suffering from primary generalized absence epilepsy were asked to estimate time under EEG monitoring. They were asked to press a button when they thought that a fixed period of time had elapsed. Only the first response after the passage of the interval was reinforced. The dependent variable was the duration of the interval between the start of the trial and the first response, the post-reinforcement time. This parameter was used as an index for the accuracy of time estimation. The performance of the subjects in trials with and without spike wave discharges was compared. Short spike wave discharges (less than 3 s) prolonged the duration of the post-reinforcement pause while longer ones reduced its duration. The prolongation was longer than could be anticipated from the duration of the spike wave discharge. It was also found that the time between the end of an EEG paroxysm and the first response was significantly shorter in trials with long spike wave discharges than in trials with short spike wave discharges. There were no differences between subjects with and without spike wave discharges. It was concluded that this type of time estimation task is sensitive in detecting cognitive disturbances induced by both short and long spike wave discharges. Moreover, it seems that after long spike wave discharges patients behave differently and are perhaps more severely disturbed.(ABSTRACT TRUNCATED AT 250 WORDS)