Changes in the behavior of research subjects that is caused by the unintended influence of the subjects' own expectations is called the

During a typical morning, Colin will check the clock more frequently as the time for his regularly scheduled lunch break approaches. In this case, Colin's clock-checking behavior is reinforced on a _____ schedule.

Fill in the blank(s) with the appropriate word(s).

Which of the following terms refers specifically to a biologically-based vulnerability?

a. Inclination b. Amenorrhea c. Diathesis d. Ethos