Faulty test parameters The functional mechanism of the "fruit machine" was pseudo-scientific and its results inaccurate. First, the pupillary response test was based on fatally flawed assumptions: That the chosen visual stimuli would produce a specific involuntary reaction that could be measured scientifically with 1960s technology; that homosexuals and heterosexuals would respond to these stimuli differently with enough frequency and specificity to sort them; and that there were only two types of sexuality.The Current. CBC Radio. 9 May 2005. One physiological problem with the method was that the researchers failed to take into account the varying sizes of the pupils and the differing distances between the eyes. Other problems that existed were that the pictures of the subjects' eyes had to be taken from an angle, as the camera would have blocked the subjects' view of the photographs if it were placed directly in front. Also, the amount of light coming from the photographs changed with each slide, causing the subjects' pupils to dilate in a way that was unrelated to their interest in the picture. Finally, the dilation of the pupils was also exceedingly difficult to measure, as the change was often smaller than one millimeter.
Faulty test parameters The functional mechanism of the "fruit machine" was pseudo-scientific and its results inaccurate First the pupillary response test was based on fatally flawed assumptions That the chosen visual stimuli would produce a specific involuntary reaction that could be measured scientifically with 1960s technology; that homosexuals and heterosexuals would respond to these stimuli differently with enough frequency and specificity to sort them; and that there were only two types of sexualityThe Current CBC Radio 9 May 2005 One physiological problem with the method was that the researchers failed to take into account the varying sizes of the pupils and the differing distances between the eyes Other problems that existed were that the pictures of the subjects' eyes had to be taken from an angle as the camera would have blocked the subjects' view of the photographs if it were placed directly in front Also the amount of light coming from the photographs changed with each slide causing the subjects' pupils to dilate in a way that was unrelated to their interest in the picture Finally the dilation of the pupils was also exceedingly difficult to measure as the change was often smaller than one millimeter