A Project On

A PROJECT ON

EMOTION DETECTOR SUBMITTED TO: ABHISHEK SINGH RATHOUR (senior lecturer,EC)

PROJECT GUIDE: Arti Saxena (lecturer selection grade, EC) CO-GUIDE: Mallika srivastav MEMBERS: ( Lecturer)

 Avneesh Kumar Dwivedi (0616431030)  Balvindar Singh (0616431031) Electrodermal Response EDR  Bhanu is actuallyPrakash the medically Singh preferred term for changing of electrical skin resistance due to psychological condition. The term Galvanic (0616431032) Skin Response or GSR remarkably dates back to about 1900. The change is caused by the degree EC-IVth YEAR

ABSTRACT:

to which a person’s sweat glands are active. Psychological stress tends to make the glands more active and this lowers the skin's resistance. It is popularly known as a lie detector or psychogalvanometer, but is also used in Biofeedback conditioning. The theory is that; the more relaxed you are, the dryer your skin will be and so the higher the skin’s electrical resistance. When you are under stress your hand sweats and then the resistance goes down. The range is reported to be 5K to 25K Ohms, but I'm not sure where the measurement was taken. You use "Sticky Back Velcro" and Aluminum Foil to make them. An assembly diagram and photo of the finished product are shown below. I used the Loop side of the Velcro (looks like carpet) for the part that wraps around the finger, and small square of the Hook side (stiffer plastic) to act as a catch. The stripped and frayed end of the LEGO connector wire is sandwiched between the Loop sticky side and the Aluminum Foil that covers the rest of the probe. These are known as a dry type electrodes. Professional electrodes would employ a conductive paste that would make the readings more stable and repeatable.

. Below is a very simple NXT program that produces a tone whose frequency corresponds to skin resistance. The greater the skin resistance, the greater the RAW sensor value. Higher skin resistance indicates a more relaxed condition, so this produces a lower frequency tone. Sweating lowers the skin resistance and in turn produces a lower RAW sensor value. This then produces a higher frequency tone. If the electrodes are not connected, the RAW value is 1023 which results in a negative frequency and the NXT produces no sound.

I also wrote a simple data logging program that just records the RAW sensor value every 10 seconds into a file. The file is then uploaded from the NXT to the PC and plotted using Excel. Below is a graph of my GSR while playing an intense video game. Lower values indicate lower skin resistance and hence higher stress. Near the end I was trapped in a dark room and was being munched to death by aliens. The rapid drop in skin resistance reflects the increased tension of being killed. I kept recording for a few minutes after the game to capture the emotional recovery.

Software Required: Pic C

for serial input output interface

Matlab with GUI RS 232 protocol

for PC interface self developed data packet

Hardware Required: Crystal oscillator 4Mhz Microcontroller 16F84/16F72 Chip max 232 Voltage regulator 7805 GSR sensor Op-Amp LM324, TL062,TL082,CA 3140 CONCLUSION:

GSR measurement is one component of polygraph devices and is used in scientific research of emotional arousal. The E-meter, which is used by the Church of Scientology, is a GSR measurement device. GSR measurement is also becoming commonplace in hypnotherapy and psychotherapy practice where it can be used as a method of detecting depth of hypnotic trance prior to suggestion therapy commencing. When traumatic material is experienced by the client (for example, during hypnoanalysis), immediate changes in galvanic skin response can indicate that the client is experiencing emotional arousal. It is also used in behavior therapy to measure physiological reactions such as fear

REFERENCE Conesa, J. (1995). Electrodermal palmar asymmetry and nostril dominance. Perceptual and Motor Skills, 80, 211-216. Pei Z. Zhang et al., "Respiration Response Curve Analysis of Heart Rate Variability", Apr. 1997, pp 321-325, IEEE Transactions on Biomedical Engineering, vol. 44, No. 4