The APA Handbook of Nonverbal Communication provides scholarly reviews of state-of-the-art knowledge in the areas of nonverbal communication and nonverbal behaviors. It includes an entire section devoted to new and improved methodologies and technologies that allow for the recording, capture, and analysis of nonverbal behaviors. The primary audience for the book is researchers in the area, as well as students in graduate-level classes on nonverbal communication or behavior. The handbook is organized around four broad themes. The first concerns the history of the field. The second concerns the factors of influence of nonverbal communication and encompasses the main theoretical and conceptual frameworks within which research on nonverbal communication occurs. The third theme presents the separate sources of nonverbal communication and behavior. The fourth theme concerns advances in research methodologies.