Turner DP, et al. - As daily diaries or calendars are often recorded by individuals with headache to identify patterns of triggers, researchers used experimental, yet realistic, headache calendars to determine the ability of individuals to recognize the degree of relationship between triggers and headaches. In this cross-sectional, observational study, 300 adults with migraine were presented with headache calendars and requested to rate the strength of the relationship (how strongly one causes the other) between 3 experimental triggers (high stress, poor sleep, and cinnamon) and headache using a 0 (“no relationship”) to 10 (“perfect relationship”) scale for each calendar. Higher participant ratings were noted for calendars with a high positive correlation between trigger and headache than those with low correlations. Outcomes supported the assumption that individuals with headache are capable of identifying correlations between headaches and triggers using headache calendars. However, individuals’ previous beliefs about the trigger and the degree of headache activity may influence these judgments.