Experimental design.

Note: A/A* to E/E* represent pairs of difficult to discriminate stimuli. A within-subjects factorial design was used that manipulated exposure type (intermixed, blocked, and control) and stimulus type (dots, faces, scenes). Each presented image was shown 5 times for 2 seconds each with a 1 second ISI. After an exposure stage (A/A* and B/B* intermixed, C/C* and D/D* blocked), participants received a same/different test phase in which the exposed stimuli and two novel pairs of stimuli (E/E* and F/F*) were presented. This design was repeated six times (twice each with dots, faces, or scenes) with different stimuli as A–F.

注意：A/A*至E/E*代表难以区分的刺激配对。本研究采用被试内因子设计，对暴露类型（混合呈现、区组呈现与对照）以及刺激类型（点刺激、面部刺激、场景刺激）两个因素进行操控。每张呈现图像将呈现5次，单次时长为2秒，刺激间间隔（Inter-Stimulus Interval，ISI）为1秒。在暴露阶段（A/A*与B/B*采用混合呈现方式，C/C*与D/D*采用区组呈现方式）结束后，参与者将进入相同-不同判断测试阶段，该阶段会呈现已暴露的刺激，以及两对全新的刺激配对（E/E*与F/F*）。该实验设计共重复6次，其中点刺激、面部刺激、场景刺激各重复2次，每次实验中A至F对应的刺激均不相同。