Interactive emotional lighting system using physiological signals

This paper proposes an emotionally interactive lighting system to support affective experiences while enjoying video content. The emotional lighting system is controlled by changes in an individual¿s emotional state. The newly designed system consists of an emotion recognition system that uses three different physiological signals (photoplethysmography, skin temperature, and galvanic skin response), an emotion lighting control system, and an emotion ambient lighting system. The physiological responses of nineteen subjects are evaluated in terms of emotional arousal and relaxation states with two different colors of light. The physiological signals are analyzed in both the time and frequency domain, and test results show that the peak-to-peak interval value and ratio of high to very-low frequencies of the photoplethysmography signals decreases significantly following a red light stimulus when arousing video content is played, whereas the same factors exhibit a significant increase after a blue light stimulus while relaxing video content is watched. These results show that red and blue light is an effective intensifier of emotional arousal and relaxation experiences during displays of arousing and relaxing video content, respectively.