Ingrid and a friend of Ingrid's sometimes notice that they often feel terrific the day after their menstrual periods end. They've discussed this with each other a few times. What is the most likely explanation for their observations?

Question

Quizplus · Accepted Answer

Ingrid and her friend are likely experiencing confirmation bias, where they notice instances that confirm their belief that they feel better after their menstrual periods end. There is no evidence of postmenstrual or premenstrual syndrome.

Ingrid and a Friend of Ingrid's Sometimes Notice That They