/ Home


Eye Colour and Flicker Frequency

Keywords: one-way analysis of variance


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 investigation recorded critical flicker frequency and iris colour of the eye for 19 subjects.

Variable Description

ColourEye colour: Brown, Green or Blue
FlickerCritical flicker frequency in cycles/sec


Data File (tab-delimited text)


The effect of iris color on critical flicker frequency. Journal of General Psychology (1973), 91-95.
Devore and Peck, Page 566.


I use this data as an example of post-hoc comparisons, because there is no obvious prior hypothesis relating eye colour to flicker frequency.



Home - About Us - Contact Us
Copyright © Gordon Smyth