Advances in Motivation Science, Volume Nine,the latest release in Elsevier's serial on the topic of motivation science, contains interesting articles that cover topics such as The Relentless Pursuit of Acceptance and Belonging, Reward uncertainty and the aversion-attraction dilemma, Neurobiological Mechanisms of Selectivity in Motivated Memory, Accounting for long-term motivation and sustained motivated learning, Interest: A Unique Affective and Cognitive Motivational Variable That Develops, and Neural systems for aversively motivated behavior, Neural systems for aversively motivated behavior, and more. Presents new research in the field of motivation science and research Provides a timely overview of important research programs conducted by the most respected scholars in psychology Gives special attention to directions for future research