Works CitedWorks Cited Ekman, Paul, and Erika L. Rosenberg. What the Face Reveals: Basic and Applied Studies of Spontaneous Expression Using the Facial Action Coding System (FACS). New York: Oxford UP, 1997. Print. Sayette, Michael A. "A PSYCHOMETRIC EVALUATION OF THE FACIAL ACTION CODING SYSTEM FOR ASSESSING SPONTANEOUS EXPRESSION." Journal of Nonverbal Behavior (2001): n. pag. Print. Grusser, Otto-Joachim. "Brain Mechanisms for Recognition of Faces, Facial Expression and Gestures:Neuropsychological and Electroencephalographic Studies in Normals, Brain Leisoned Patients and Schizophrenics." Vision and the Brain (1990): n. pag. Print. Leon, Enrique. "A User Indpendent Real Time Emotion Recognition System for Software Agents in Domestic Enviroment." Engineering Applications of Artificial Intelligence (2007): n. pag. Print. Uy, C. C. "Autonomic Mechanisms of Emotional Reactivity and Regulation." Pschyology (2013): n. pag. Print. Vila, J. "Time Frequency Analysis of Heart Rate Variability." IEEE (1997): n. pag. Print. Williams, Claire. "Impairment in the Recognition of Emotion across Different Media following Traumatic Brain Injury." Psychology Press 32.2 (2010): 113-22. Print.