Several studies on the role of genetics in autism have focused on ____ —enzymes that regulate the repair and replication of DNA and the production of certain types of RNA

Which is most dissatisfying in a relationship?

a. being underbenefited b. being overbenefited c. being underbenefited or overbenefited d. investing in a relationship and getting a comparable reward

Sally likes Jon and readily agrees whenever he asks her out. She likes Sim less than she likes Jon and accepts a date with him occasionally. When she falls in love with Edgar, she informs both Jon and Sim that she will no longer go out with them. Jon quickly stops asking her out, but Sim persists for several months. Sim's behavior illustrates _____

A) ?the partial reinforcement effect B) ?the peak shift effect C) ?an extinction burst D) ?spontaneous recovery