Aunt Bea gave Opie fried chicken livers every time he made his bed. Opie began making his bed more often than he used to. In this example, chicken livers are a _______ reinforcer

Which of the following is a biological intervention that involves the removal or destruction of brain tissue?

a. Electroconvulsive therapy b. Psychotherapy c. Psychoanalysis d. Psychosurgery

In North America and Europe, children with siblings are __________ children with no siblings.

A. about as common as B. slightly less common than C. slightly more common than D. far more common than