面孔局部变化对倒置效应的影响

Influence of Facial Featural Changes upon Inversion Effect

目的比较被试对相同刺激在不同诱导条件下认知差异,探讨倒置效应和局部变化在面孔识别中的意义。方法采用诱导启动范式,使被试将相同视觉刺激分别认知为简化面孔和字母组合,并比较在不同认知条件下反应的准确率和反应时间的差异。结果被试倒置对面孔组和字母组的准确率无显著影响[（94.01±7.75）%vs（93.97±6.63）%,（89.58±8.61）%vs（88.80±6.03）%,P〉0.05];倒置对面孔组和字母组的两种刺激的反应时间亦无显著影响[（3080.87±712.52）m s vs（3156.88±436.92m s,2754.84±831.28）m s vs（2706.24±929.52m s,P〉0.05）];反应时和准确率的相关均未达显著性水平（r=0.021~0.418,P〉0.05）。结论在局部变化条件下,由于不涉及面孔刺激的结构性认知加工,倒置不会显著地影响其细节特征的认知,间接地证明了面孔倒置效应的结构性认知的加工机制。

Objective To compare the cognitive difference of subjects＇ responses to the same visual stimuli under two different priming conditions,and discuss the influence of inversion effect and featural changes upon facial cognition.Methods Priming pattern was employed,and subjects were induced to recognize the same stimuli as schematic faces or three English letters under different priming conditions.The participants＇ accuracy and reaction times were compared in two priming conditions.Results There were no influences of inversion effect upon the reaction times and accuracy of both facial stimuli and English letter stimuli（94.01±7.75% vs 93.97±6.63%,89.58±8.61% vs 88.80±6.03%,3080.87±712.52ms vs 3156.88±436.92ms,2754.84±831.28ms vs 2706.24±929.52ms,P0.05）.Correlations of accuracy to reaction times reached no significant difference under two conditions（r=0.021～0.418,P0.05）.Conclusion Under the condition of featural changes,facial configural cognition isnct involved,and the featural cognition is intact in inversion,which demonstrates indirectly mechanism of configural cognition underlying facial inversion effect.