by MIT 250 IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 57, NO. 5, MAY 2010 ig. 9. Long-term in situ EDA recordings. Continuous skin conductance mea- urements were recorded for seven days in a natural home environment. Daily physical exertion task for the conductive fabric electrodes than for the traditional Ag/AgCl electrodes. In view of this, we rec- ommend using standard Ag/AgCl electrodes for more sensitive analysis of EDA measurements. Long-term assessment of EDA revealed interesting trends in the participant’s sympathetic modulation over a week-long period. Intervals of elevated EDA frequently corresponded to times when the participant was studying, doing homework, or taking an exam. This is possibly due to the increased cognitive stress associated with these activities. The characteristic peaks occurring during sleep have been associated with slow-wave sleep  and remain a subject for future studies. We found the sensor wristband to provide reliable and robust attachment of the electrodes to the skin, even in the presence of forearm motion during normal daily activities. Motion artifacts were typically observed only when the electrode–skin interface was disturbed such as when external pressure was applied against the electrodes or when the wearer readjusted the position of the electrodes. VI. CONCLUSION We have presented a compact and low-cost wearable EDA sensor that enables comfortable long-term assessment of EDA. The novelty of our system consists of the use of the dorsal forearms as recording sites, the miniaturization of the sensor module, as well as the design of a small wristband that allows for unobtrusive and nonstigmatizing continuous EDA measure- ments during everyday activities. Experimental outcomes using http://aﬀect.media.mit.edu/pdfs/10.Poh-etal-TBME-EDA-tests.pdf#search='MIT+TBME'