Behavior of Nonhuman Primates: Modern Research Trends, Volume I focuses on studies on the dynamics of behavior of nonhuman primates. The selection first offers information on discrete-trial training techniques and stimulus variables and discrimination-learning sets. Discussions focus on the characteristics of learning-set behavior, procedural variables, basic learning-set procedures, renaissance of contiguity, border cues and additivity, and contiguity and automation. The text then ponders on hypothesis behavior and delayed-response problem, including variations of the delayed-response problem; delayed response and discrimination learning contrasted; and the hypothesis model and its application to the object-discrimination-learning-set experiment. The manuscript examines associative problems and operant conditioning. Topics include discriminative behavior, similarity and dissimilarity problems, alternation problems, discrimination reversal problems, discrimination problems, and behavior controlled by aversive stimuli. The text is a valuable reference for researchers interested in the behavior of nonhuman primates.