... determine specific types of pattern that induced the electroencephalographic precursors of seizures. Further investigation suggested that pattern sensitivity in epilepsy was not as rare as first thought and subsequentially led to studies that determined the stimulus characteristics responsible for the EEG abnormalities in patients with epilepsy (Wilkins et al., 1975, 1979a, 1980, 1981; cited in Wilkins, 1995). The pattern parameters found to increase the probability of epileptiform activity became the basis of research into parameters that induce illusions (Wilkins et al., 1984). Until 1984, there appeared to be no study that examined the spatial parameters of patterns to determine the properties that induced the documented visual illusions. As a result, experimentation by Wilkins et al. (1984) set out to show that the spatial properties that induced illusions and headaches were quite specific. Wilkins et al. (1984) presented participants who did not suffer from epilepsy, with a booklet of patterns having various spatial ...

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