In 1992, Karen Basen-Engquist began a trend of applying one of this psychologist's concepts to HIV-avoidance in sexual behavior. James Maddux's "imaginal experiences" extended that concept by this psychologist. Robert Sears and this psychologist developed a framework that posits reciprocal determinism and a stimulus-response "mediating process." This psychologist cited mastery and vicarious experiences as influencing one's perceived ability to control life events. This psychologist added a cartoon cat in the follow-up to a study testing his conditioning-derived "social learning theory." This coiner of (10[1])"self-efficacy" predicted same-sex models' use of a mallet to be more often mimicked for a 1960 Stanford experiment. For 10 points, name this psychologist who studied aggressive behavior in the Bobo doll experiment. ■END■