Barbaree H E, Baxter D J, Marshall W L
Department of Psychology, Queen's University, Kingston, Canada.
Violence Vict. 1989 Winter;4(4):299-306.
Erectile responses of a sample of incarcerated rapists (N = 60) and male university students (N = 41) were monitored during verbal descriptions of adult heterosexual interactions. The verbal descriptions varied in terms of the consent given by the female and the degree of force or coercion used by the male. Each subject was tested in two laboratory sessions, and rape indices were calculated as the ratio of rape arousal to consenting arousal. The discrimination between consenting and nonconsenting cues was stronger in nonrapists than rapists. This difference was observed mainly because of an increase in the nonrapists' discrimination in the second session, in which nonrapists' arousal to consenting cues was enhanced. Based on the whole sample, test-retest reliability coefficients were unacceptably low. Eliminating subjects exhibiting only minimal arousal according to various criteria yielded higher coefficients in both groups. However, in the nonrapist group, acceptable levels of reliability were only reached after eliminating all subjects who did not reach at least 75% of full erection (over half the sample). We concluded that the reliability of the rape index is questionable, particularly when there is doubt as to whether the subject being tested is a rapist or a nonrapist, or when testing only nonrapists.
在对成年异性互动进行口头描述的过程中，对一组在押强奸犯（N = 60）和男大学生（N = 41）的勃起反应进行了监测。这些口头描述在女性给予的同意程度以及男性使用的武力或胁迫程度方面存在差异。每个受试者在两个实验室环节中接受测试，强奸指数计算为强奸唤起与同意唤起的比率。非强奸犯对同意和不同意线索的辨别能力比强奸犯更强。观察到这种差异主要是因为在第二个环节中非强奸犯的辨别能力有所提高，在该环节中非强奸犯对同意线索的唤起增强。基于整个样本，重测信度系数低得令人无法接受。根据各种标准排除仅表现出最小唤起的受试者后，两组的系数都有所提高。然而，在非强奸犯组中，只有在排除所有未达到至少75%完全勃起的受试者（超过一半的样本）后，才达到可接受的信度水平。我们得出结论，强奸指数的可靠性值得怀疑，特别是当对被测试对象是强奸犯还是非强奸犯存在疑问时，或者仅对非强奸犯进行测试时。
