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Table 1 Mean absolute tonic pupil diameter (in pixels) for the four difficulty conditions (derived from participant ratings) and ten time bins

From: Pupil diameter changes reflect difficulty and diagnostic accuracy during medical image interpretation

  Time 1 Time 2 Time 3 Time 4 Time 5 Time 6 Time 7 Time 8 Time 9 Time 10 Overall mean
Least difficult 13.41 13.32 13.33 13.27 13.32 13.37 13.29 13.39 13.36 13.26 13.33
Somewhat difficult 13.47 13.46 13.50 13.56 13.51 13.46 13.65 13.38 13.40 13.30 13.47
Moderately difficult 13.61 13.59 13.62 13.65 13.61 13.60 13.69 13.69 13.69 13.69 13.64
Most difficult 14.03 13.93 13.95 14.03 13.93 13.90 13.87 13.92 13.89 13.91 13.94