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Table 1. 
Overview of the Critical Manipulations in Each Experiment
 ObjectivesProcedureTaskSti.Baseline Pupil Response Pattern Caused by Sequential Luminance Contrast Change
E1 To examine how the pupil responds to attractiveness. Participants made the judgment of an image while their pupillary responses were recorded. Att., Rnd. FC, GF Pupil constriction to FC, pupil dilation to GF. 
E2 To replicate the result of E1 by using equal luminance images. Same as E1 Att., Rnd. FC (eql), NS (eql) Pupil constriction to both FC and NS (even when the mean luminance change is equated). 
E3 To examine whether stimulus presentation duration affects the result. Participants viewed the image for 5 sec and held their response until the stimulus was off. Att. FC (eql) Pupil constriction to FC (even when the mean luminance change is equated). 
E4 (1) To examine whether task demand affects the result. (2) To minimize the effect of stimulus luminance on pupils. Same as E3, or just viewing the stimulus for 5 sec without judgment. Att., Pas. FC (line) Pupil constriction to FC in both Att. and Pas. (slightly) conditions. 
E5 To examine whether baseline pupil response pattern affects the result. Same as E1 Att. FC, GF Pupil dilation to FC, pupil constriction to GF. 
E6 To examine whether implicit pupil size manipulation contributes to attractiveness. Same as E1 Att. FC The amount of pupil size change was manipulated. 
E7 To rule out the confounding of sequential luminance contrast in E6. Same as E1 Att. FC The amount of pupil size change was equated while the sequential luminance contrast change was manipulated. 
 ObjectivesProcedureTaskSti.Baseline Pupil Response Pattern Caused by Sequential Luminance Contrast Change
E1 To examine how the pupil responds to attractiveness. Participants made the judgment of an image while their pupillary responses were recorded. Att., Rnd. FC, GF Pupil constriction to FC, pupil dilation to GF. 
E2 To replicate the result of E1 by using equal luminance images. Same as E1 Att., Rnd. FC (eql), NS (eql) Pupil constriction to both FC and NS (even when the mean luminance change is equated). 
E3 To examine whether stimulus presentation duration affects the result. Participants viewed the image for 5 sec and held their response until the stimulus was off. Att. FC (eql) Pupil constriction to FC (even when the mean luminance change is equated). 
E4 (1) To examine whether task demand affects the result. (2) To minimize the effect of stimulus luminance on pupils. Same as E3, or just viewing the stimulus for 5 sec without judgment. Att., Pas. FC (line) Pupil constriction to FC in both Att. and Pas. (slightly) conditions. 
E5 To examine whether baseline pupil response pattern affects the result. Same as E1 Att. FC, GF Pupil dilation to FC, pupil constriction to GF. 
E6 To examine whether implicit pupil size manipulation contributes to attractiveness. Same as E1 Att. FC The amount of pupil size change was manipulated. 
E7 To rule out the confounding of sequential luminance contrast in E6. Same as E1 Att. FC The amount of pupil size change was equated while the sequential luminance contrast change was manipulated. 

Att. = attractiveness task; Rnd. = roundness task; Pas. = passive viewing; Sti. = stimuli; FC = faces; GF = geometric figures; NS = natural scenes; eql = equal luminance; line = line drawing.

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