Jessie is an adolescent in Arizona. By the end of high school, he had experimented some with substance use. It is unlikely that he tried which of the following substances?

Carolyn Rovee-Collier's research used a moving mobile or a moving train to assess infant memory. This research shows

a. a steady improvement in memory during the first 18 months of life. b. no consistent pattern in memory development, because the measure of memory used for the first 6 months yields very different data from the measure of memory used later in infancy. c. a very low level of correct responses during the first 6 months, because infants' brain development is incomplete, followed by a very rapid increase in memory. d. a very rapid increase in memory during the first 6 months, followed by a more gradual increase and then a plateau.

When Carolyn Rovee-Collier and other researchers use the conjugate reinforcement technique, a baby demonstrates memory by

a. showing dishabituation to a familiar stimulus, measured in terms of sucking responses. b. staring longer at a mobile that has never been seen before. c. smiling more at a familiar stimulus than at an unfamiliar stimulus. d. kicking his or her leg when the mobile is presented.