When using a photic stimulator, which flash rate is most likely to activate seizure activity?

The flash rate of 15 to 18 flashes per second is associated with a frequency range that is most likely to induce seizure activity, particularly in individuals with photosensitive epilepsy. This rate falls within a critical range where photic stimulation can provoke an exaggerated cortical response, leading to epileptiform discharges.

Higher frequency flashes can enhance the likelihood of triggering seizures in susceptible individuals because they create a rhythmic stimulus that can synchronize neuronal firing. Specifically, this range is noted in clinical practice and research as particularly effective at eliciting responses in those who exhibit photosensitivity. Therefore, utilizing flash rates within this range is crucial during diagnostic procedures to assess for potential seizure responses in patients who may be affected by this type of stimulus.