Figure 12 - uploaded by Joost de Winter
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Local darkness for the images of five themes in Experiment 1 and the preceding control slide. The dotted vertical line indicates the moment of transition from the control slide to the stimulus slide. The jump in local darkness occurring at 10 s is due to the appearance of the image, which resulted in a change of local darkness.

Local darkness for the images of five themes in Experiment 1 and the preceding control slide. The dotted vertical line indicates the moment of transition from the control slide to the stimulus slide. The jump in local darkness occurring at 10 s is due to the appearance of the image, which resulted in a change of local darkness.

Source publication
Preprint
Full-text available
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
... understand these image-specific effects in pupil dilation, we computed local darkness LD t at each sampling instant ( Figure 4). There were substantial differences in local darkness between images, even though all images had the same global darkness of 50% (see Appendix H). ...
Context 2
... dotted vertical line indicates the moment of transition from the control slide to the stimulus slide. Figure 14 shows the mean PC t for the 12 words, whereas Table 7 shows the mean PC [1,9] values. A two-way repeatedmeasures ANOVA of PC [1,9] showed no significant effect of valence, F(1,146) = 0.14, p = .713, ...
Context 3
... Videos of 24 slide changes were recorded at 1000 Hz through the lens of the projector, by placing the camera right in front of the lens (see Figure D4 for the experimental configuration and Figure D7, top for the corresponding camera view). These measurements were conducted in batches of three slide changes, as the recording time of the camera at this frequency was limited to 4 seconds. ...
Context 4
... r = .99 (n = 5 stimuli) ( Figure N4). These findings indicate that the results in Hess and Polt (1960) match the raw data in the archive. ...
Context 5
... Box M4166, Folder Early Pupil. Figure N4. Gender differences in pupil diameter as calculated from the datasheets versus gender differences in pupil area, as reported in Hess and Polt (1960). ...
Context 6
... dotted vertical line indicates the moment of transition from the control slide to the stimulus slide. Note that this figure contains the same results as Figure 14, except that a subtractive instead of divisive baseline correction is used. Figure O2. ...
Context 7
... 75-s video clip of the episode "Survival" from the Western TV series "A man called Shenandoah" was shown, corresponding to the scene highlighted by Hess (1975b) (Figure 1; see Figure J4 for a video frame). The clip was 1348 pixels wide and 1080 pixels high (original size: 720 x 480 pixels). ...
Context 8
... understand these image-specific effects in pupil dilation, we computed local darkness LD t at each sampling instant ( Figure 4). There were substantial differences in local darkness between images, even though all images had the same global darkness of 50% (see Appendix H). ...
Context 9
... dotted vertical line indicates the moment of transition from the control slide to the stimulus slide. Figure 14 shows the mean PC t for the 12 words, whereas Table 7 shows the mean PC [1,9] values. A two-way repeatedmeasures ANOVA of PC [1,9] showed no significant effect of valence, F(1,146) = 0.14, p = .713, ...
Context 10
... Videos of 24 slide changes were recorded at 1000 Hz through the lens of the projector by placing the camera right in front of the lens (see Figure D4 for the experimental configuration and Figure D7, top left, for the corresponding camera view). These measurements were conducted in batches of three slide changes, as the recording time of the camera at this frequency was limited to 4 s. ...
Context 11
... r = .99 (n = 5 stimuli) ( Figure N4). These findings indicate that the results in Hess and Polt (1960) match the raw data in the archive. ...
Context 12
... Box M4166, Folder Early Pupil. Figure N4. Gender differences in pupil diameter as calculated from the datasheets versus gender differences in pupil area, as reported in Hess and Polt (1960). ...
Context 13
... dotted vertical line indicates the moment of transition from the control slide to the stimulus slide. Note that this figure contains the same results as Figure 14, except that a subtractive instead of divisive baseline correction is used. Figure O2. ...

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