To evaluate the effects of hyperventilation on Necker cube reversal and duration of spiral aftereffect, 42 males were each tested subsequent to no, slow, and rapid hyperventilation. A significantly (p < .01) greater number of Necker cube reversals and significantly (p < .05) shorter durations of spiral aftereffect occurred subsequent to both slow and rapid hyperventilation conditions. It is proposed that hyperventilation reduces the effectiveness of the perception of both illusions.
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