How good are people at determining cause, effect and migraine triggers? (Not very good.)
Consider the fascinating, but disturbing results of a psychology experiment1 Jay Olson recently conducted at McGill University in Montreal, Canada. Olson asked test participants to select a random card while he flicked through a deck of playing cards. Unbeknownst to participants, the 10 of hearts had been slightly altered2 which caused it to be visually exposed for a few milliseconds longer than any of the other cards. As a result, 98% of participants chose the 10 of hearts - not such a random choice afterall!