Figure 10 - uploaded by Joost de Winter
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Mean local darkness (LD t ) for the schematic eyes in Experiment 2 and the preceding control slide. The dotted vertical line indicates the moment of transition from the control slide to the stimulus slide.

Mean local darkness (LD t ) for the schematic eyes in Experiment 2 and the preceding control slide. The dotted vertical line indicates the moment of transition from the control slide to the stimulus slide.

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Several papers by Eckhard Hess from the 1960s and 1970s report that the pupils dilate or constrict according to the interest value, arousing content, or mental demands of visual stimuli. However, Hess mostly used small sample sizes and undocumented luminance control. In a first experiment (N = 182) and a second preregistered experiment (N = 147), w...

Contexts in source publication

Context 1
... was no significant 'number of eyes' x 'depicted pupil size' interaction, F(4, 584) = 0.74, p = .567, η 2 p = .01. Figure 10 shows that LD [1,9] was highest for the stimulus with one eye and a large pupil. This finding can again be explained by the fact that, when there was only one eye, this was where participants looked. ...
Context 2
... luminance values were between 1054 and 1175 cd/m 2 when the slide was on the projection location and between 72 cd/m 2 and 86 cd/m 2 during the periods of darkness. Figure D10 combines the information of all four measurement series and shows a timeline of a slide change, including luminance and sound production. It can be seen that slide changes yielded a 1-s period of darkness (about 650 ms of full darkness and about 200 ms of partial darkness before and after). ...
Context 3
... as a function of time. Figure D10. Timeline of a slide change. ...

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