Skadorwa T, et al. – Physicians designed this study to investigate the patterns of intrahemispheric propagation in pediatric photoparoxysmal response (PPR). Regardless of the grade of photosensitivity (PS) and the presence of epilepsy, a symmetric, bilateral pattern was the most common type of PPR across genders and all ages. The study demonstrated the current PPR classification in a new light and gave a basis for the concept of PPR lateralization based on objective, quantitative findings.

• A total of 89 individuals of both sexes, aged 5-18 years, epileptic and non-epileptic, in whom a PPR was elicited by IPS during a standard EEG procedure were described.
• The physicians examined the distribution of amplitude and intrahemispheric coherence indices and revealed a unique pattern of PPR propagation in each case.

• The physicians found a lateral (occipito-temporo-frontal) track in 52% of recordings, and 55% of individuals tested demonstrated symmetric patterns.
• As per the outcomes, a bilateral pattern dominated in all age groups, all grades of PS, and across epileptic and non-epileptic groups.