A biological bridge between the experience of stress, circadian rhythms, and the development of depression is formed by hormones released at times of stress, including ____.?

Along with other depressants, alcohol appears to affect ________ activity

a. serotonin b. endorphin c. norepinephrine d. GABA

You deprive your dog of food just before you begin training him to sit down on command. You give your dog food only when he sits on the floor after you press on his back. Pretty soon your dog is sitting on the floor consistently

According to Skinner, your dog's behavior has been caused by a. his desire to get the food. b. his feelings of extreme hunger. c. a combination of his innate intelligence, problem-solving ability, and motivation. d. deprivation and the use of his food as reinforcement.