The Hidden Dangers Of A Simple Image
Feb 12, 2015
The McCollough effect was first reported by Celeste McCollough Howard, an American psychologist, in 1965. A trial in 1975 found that a 15 minute induction period (exposure to the green/black and red/black pictures) led to the effect lasting for over three months, so the video isn't exaggerating.
Although countless trials and variations of this effect have been done, very little is known about why it occurs in the first place. It has been found, however, to be stronger in extroverts than introverts. And, it has also been proposed as a test for extroversion.
This video discusses the McCollough effect. Although the warnings that are given seem a little over-the-top, they aren't actually too far off from the truth.