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Pattern sensitivity and photosensitivity in epileptic children with visually induced seizures
M Brinciotti1, M Matricardi, A Pelliccia
1Istituto di Neuropsichiatria Infantile, Università La Sapienza, Centro Interdipartimentale Malattie Social, Rome, Italy.
Insights
Epileptic children with reflex seizures show varied responses to visual stimuli. Pattern sensitivity, especially without light sensitivity, is linked to specific epilepsy types and EEG findings.
Area of Science:
- Neurology
- Pediatric Neurology
- Epileptology
Background:
- Reflex seizures in children can be triggered by visual stimuli.
- Understanding photosensitivity and pattern sensitivity is crucial for managing epilepsy.
Purpose of the Study:
- To evaluate photosensitivity and pattern sensitivity in epileptic children.
- To analyze clinical and EEG characteristics based on visual stimulus sensitivity type.
Main Methods:
- Visual stimulation tests were performed on 74 epileptic children.
- Clinical and electroencephalogram (EEG) data were analyzed.
- Patients were categorized by sensitivity to light, pattern, or both.
Main Results:
- 67 children completed the study; 51% were sensitive to both light and pattern.
- Photosensitivity was more common (33%) than pattern sensitivity (16%).
- Intermittent light stimulation elicited generalized EEG abnormalities more often than pattern stimulation (73% vs. 36%).
- Pattern-sensitive epilepsy without photosensitivity showed higher rates of symptomatic epilepsies, neurological deficits, and focal EEG abnormalities.
Conclusions:
- Photosensitivity and pattern sensitivity are distinct but overlapping phenomena in childhood epilepsy.
- Specific clinical and EEG features correlate with different patterns of visual sensitivity.
- Pattern sensitivity warrants further investigation in epilepsy management, particularly in cases without photosensitivity.
Abstract:
We evaluated photosensitivity and pattern sensitivity in 74 epileptic children (38 males, 36 females aged 4.4-19 years; mean age 11.9 years) with reflex seizures induced by environmental visual stimuli and analyzed clinical and EEG characteristics of patients according to type of sensitivity. Standard procedures of visual stimulation were used in all cases. Seven children were excluded because of poor cooperation (3) or no activation (4). Fifty-one percent of the remaining 67 patients showed sensitivity to both light and pattern, whereas 33% showed photosensitivity and 16% showed pattern sensitivity. Generalized abnormalities were more frequently elicited by intermittent light stimulation than by pattern (73 vs. 36%, p < 0.001). Significant differences in clinical and EEG findings were noted among patients according to their sensitivity to light or/and pattern. In particular, pattern-sensitivity patients without photosensitivity had a higher occurrence of localization-related symptomatic epilepsies, neurologic abnormalities, and epileptiform EEG abnormalities, mainly focal, at rest.