Personality psychology using heart responses to color stimulus

The Lüscher Color Psychology Test measures a person's psychophysical state, his ability to withstand stress, perform, and communicate. This test is based on color selection in four levels of preference. In this paper, we try to use heart response and particularly time domain features of heart rate variability to find the colors preferences without asking the subjects directly. For this purpose, we used four main colors in psychology, blue, yellow, green, and red, as a visual stimulus while the lead II of ECG was recorded from 16 girls as subjects during the stimuli. Then we used time domain features of HRV's to classify four different levels of performances. The results show that these features such as NN50 and RMSSD are able to distinguish between different performances levels by p<1E-3. This method cancels the possibility of making mistake in color selection by subjects and suggests the automatic system for personality psychology without their consciousness.