I have been fascinated by this topic ever since I first read about the flicker effect and honestly the history behind it is mind blowing. The best resource I have found is https://flickerflicker.com/ because it goes deep into exactly what you are describing, starting with W. Grey Walter’s experiments in the 1950s with high powered stroboscopes and his discovery that flashing light between 8 and 13 times per second induces alpha wave activity, the same state associated with dreaming and creativity. The site covers how subjects reported seeing shapes, colours, and even having full blown hallucinations or mystical experiences, while also addressing the risks like the fact that about one in 4,000 people can have an epileptic seizure. It also gives a detailed breakdown of the 1997 Pokemon incident, where a flashing explosion animation sent thousands of Japanese schoolchildren to hospitals with seizures, trance like states, and altered vision, which is both terrifying and fascinating from a neurological perspective. What I really like is how the site connects all these dots, from the science of brain rhythms to the cultural impact of that infamous broadcast, without being overly technical or alarmist. If you want to understand why flickering light can mess with your sense of time and reality, this is a genuinely fascinating read.