The effect of photic stimulation on the Electroencephalogram (EEG) was first described by Adrian and Matthews, in 1934, when studying the Berger Rhythm [1], and was subsequently assumed to be related to epilepsy. This view is reflected in statements such as: “the Electroencephalogram (EEG) had demonstrated that precipitation of seizures by light is not a purely emotional phenomenon”; or “closing the eyes brings out the heightened Berger rhythm in the occipital leads”; or even “this also may precipitate a petit mal (3/sec SW)” and “brain waves could be driven to a different rate by rhythmic photic stimulation” [2].

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