An individual’s critical flicker frequency is the highest frequency at which the flicker in a flickering light source can be detected. At frequencies above the critical frequency, the light source appears to be continuous even though it is actually flickering. This study recorded critical flicker frequency and iris color for 19 subjects.
Note: The original paper describes a sample of 56 subjects. The data here come from the book by Devore, which list only 19 subjects. I have no idea what accounts for the discrepancy.
Color: Subject’s eye color (Brown, Green, Blue)Flicker: Critical flicker frequency (cycles per second)Original reference:
Smith JM and Misiak H. (1973). The Effect of Iris Color on Critical Flicker Frequency. The Journal of General Psychology, 89: 91-95.
I obtained the data from:
Devore J. (2016). Probability and Statistics for Engineering and the Sciences, 9th edition. Cengage learning.