Electroencephalogram (EEG): The process of recording the brain's electrical activity by attaching electrodes to the scalp and analyzing wave patterns.
Nonverbal Communication: Communication between people without the use of words. Examples include tone of voice, body language, and facial expression.
Principles of Psychology, The by William James: A seminal text in the field published in 1890, while James served as a professor at Harvard University. The full text of the work is available at http://psychclassics.yorku.ca/James/Principles/.