Eight-month old Jonathan was left by his mother at the baby-sitter's place. The minute his mother left and he could not see her, Jonathan started to cry. According to Piaget's theory of cognitive development which concept would explain Jonathan's behavior?

According to the article Yoking Smoking about operant conditioning, B.F. Skinner thought that the

frequency of behavior was maintained by (a) consequences (b) the mind (c) unconscious urges (d) classical conditioning

A person with schizophrenia continually "hears" a voice shouting, "Buckets of blood!"

when there is no one around and no radio or television is turned on. This person is experiencing a(n) a. auditory hallucination. b. vestibulary illusion. c. sane delusion. d. sane hallucination.