女大学生对不同类型性图片间认知加工的神经机制差异研究

A study on differences of cognitive mechanism in processing different types of sexual picture in female university students

目的了解女大学生对国际情绪图片系统（International Affective Picture System，IAPS）中不同类型性图片（异性恋夫妇性图片、男性性图片、女性性图片）认知加工的神经机制差异。方法应用事件相关电位（event-related potential，ERP）技术，比较18例正常女性观看中性图片和不同类型性内容图片时N2、P3及PSW波幅的差异。结果异性恋夫妇性图片诱发，前额区N2[（0．99±1．69）μV]成分、顶区P3[（17．27±1．45）μV]成分最大，其次是男性性图片[（-0．02μ1．83）斗V，（15．92±1．26）μV]，再次是女性性图片[（-0．22±1．56）νV，（15．49±1．34）μV]，且N2、P3波幅在异性恋夫妇性图片和女性性图片间差异具有统计学意义（均P〈0．05）；异性恋夫妇性图片[（15．22±1．98）νV]与女性性图片[（14．53±1．75）μV]诱发的PSW波幅差异无统计学意义，但均显著大于男性性图片[（10．93±2．60）μV]（均P〈0．05）。结论高度暴露的异性恋夫妇性图片诱发女性最强的性唤起及消耗最多的注意资源，性唤起维持时间也最长。

Objective To observe female university students＇ differences of cognitive mechanism in processing different types of sexual picture from International Affective Picture System （IAPS）. Methods Using event related potential （ERP） ,the differences of the amplitudes of N2 ,P3 and PSW were examined induced by the neutral pictures and different types of erotic pictures. Results The amplitudes of N2 （ （0.99 ± 1.69） μV） and P3 （ （ 17.27 ± 1.45 ）μV） elicited by heterosexual couple erotic pictures were highest,followed by the male erotic pictures （ （ - 0. 02 ± 1.83 ） μV, （ 15.92 ± 1.26 ） μV）, and then were the female erotic pictures （ （ - 0.22 ± 1.56 ） μV, （ 15.49 ± 1.34） μV）. There was statistical significance in N2 and P3 between heterosexual couple erotic pictures and female erotic pictures （ P 〈 0.05 ）. There was no significant difference in PSW component between het- erosexual couple erotic pictures（ （ 15.22 ± 1.98） μV） and female erotic pictures（ （ 14.53 ± 1.75） μV） ,but the PSW induced by male erotic pictures（ （ 10.93 ± 2.60） μV） was significantly smaller than the other sexual pictures （P 〈 0.05 ）. Conclusion The level of sexual arousal elicited by explicit heterosexual couple erotic pictures is highest and also the attention maintains longest.