The frequency distribution of scores and response patterns reported in this article are similar to those obtained in Petrie's original study and further support the efficacy of the Penn-Stafford shortened pre-waiting period.
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References
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PennN. E.StaffordC.The Petrie Block Task: a modification. Perceptual and Motor Skills, 1982, 55, 151–154.
2.
PetrieA.Individuality in pain and suffering. Chicago: Univer. of Chicago Press, 1967.
