Check Your Knowledge

§1194.21(k) of Section 508 addresses the adverse impact that flashing or blinking text (or other elements) may have on people with photosensitive epilepsy. Read the question below and select the response that is most accurate. You will receive immediate feedback.

What frequency rate can trigger a seizure in people with photosensitive epilepsy?

1. Greater than 2 Hz and lower than 55 Hz.
2. Between 60 Hz and 75 Hz.
3. Greater than 75 Hz and lower than 120 Hz.
4. None (frequency rate of a blinking or flashing item cannot trigger a seizure).