Quantitative analysis of Euclidean distance to complement qualitative analysis of facial expression during deception.
BACKGROUND
Accurate evaluation of an individuals' veracity is a fundamental aspect of social functioning that allows individuals to act in adaptive ways. The domain of deception detection ability is still young, and many components in this field are yet to be touched which demands more research in this field.


OBJECTIVE
The present study aims at deciphering the structural composition of face during felt, posed, and deceived emotions in facial expression unique to Indian culture, using Facial Action Coding System (FACS). Quantitative analysis of Euclidean distance has been done to complement qualitative FACS analysis.


METHODS
In this study, thirty female, young adults with age range of 23-27 years were chosen randomly for portraying their (felt, posed, and deceived) facial expression. All facial expressions were captured through instruction, and videos were converted into static images. The static images were coded on the basis of FACS to decipher the felt, posed, and deceived expressions. Quantitative analysis of the data has been done using MATLAB to meet the objectives of the study and to complement the qualitative analysis.


RESULTS
Felt and posed emotions differ in terms of intensity of the expression and subjective experience. Posed emotional and deceived expressions differ in intent. Facial asymmetry is an important indicator for detecting deception.
Department of Psychology, University of Calcutta, 92, A.P.C. Rd, Kolkata, West Bengal, India.
Ananya
A
Mondal
Department of Psychology, University of Calcutta, 92, A.P.C. Rd, Kolkata, West Bengal, India.
Pritha
P
Mukhopadhyay
Department of Computer Science and Engineering, University of Calcutta, JD-2, Salt Lake City, Kolkata, West Bengal, India.
Nabanita
N
Basu
Department of Computer Science and Engineering, University of Calcutta, JD-2, Salt Lake City, Kolkata, West Bengal, India.
Samir Kumar
SK
Bandyopadhyay
Department of Psychology, University of Calcutta, 92, A.P.C. Rd, Kolkata, West Bengal, India.
Tanima
T
Chatterjee
Deception; Euclidean distance analysis; Facial Action Coding System; felt emotion; posed emotion