Introduction
Our project measures the user's skin conductance for monitoring his or her mental state.
Summary
Medical experiments have shown that the magnitude of the electrical conductance in a person's skin is directly correlated to their emotional state. The short term changes in electrical conductances also correlate with a person's mental response. We implemented an EDA meter designed to measure skin conductance. Our design includes our own sensor, pushbuttons for user input, and an LCD menu that accesses several software features including an event recorder, waveform capture, an stimulus comparison test, and a simple biofeedback game. The software can also transmit data to the PC, where a java program collects and displays the data over a set interval of time.
Analysis
The final results of this project met the goals we set for ourselves. Although we came across several limitations in our design due to monetary and time constraints, we feel that we were able to assemble a solid project in the given time. One limiting factor was the inability to buy or sample electrodes because of the exorbitant price. While professionally manufactured electrodes would have greatly increased the resolution of our data sampling, we feel that the results we obtained from the electrodes we fabricated were more than satisfactory. Data shown in our graphs clearly show a subject's response to different questions asked as well as to visual stimulus.
Due to the wide disparity in our results, we could not get our software to recognize a lie. However, as humans, we were better able to analyze results and occasionally predicted where lies occurred. In hindsight, there are a few design aspects that we would change. Adding hardware to detect user pulse would increase the efficacy of the lie detection. Furthermore, we would improve upon our electrodes design to acquire better data.
Link: http://instruct1.cit.cornell.edu/courses/e...jw32/index.html
Our project measures the user's skin conductance for monitoring his or her mental state.
Summary
Medical experiments have shown that the magnitude of the electrical conductance in a person's skin is directly correlated to their emotional state. The short term changes in electrical conductances also correlate with a person's mental response. We implemented an EDA meter designed to measure skin conductance. Our design includes our own sensor, pushbuttons for user input, and an LCD menu that accesses several software features including an event recorder, waveform capture, an stimulus comparison test, and a simple biofeedback game. The software can also transmit data to the PC, where a java program collects and displays the data over a set interval of time.
Analysis
The final results of this project met the goals we set for ourselves. Although we came across several limitations in our design due to monetary and time constraints, we feel that we were able to assemble a solid project in the given time. One limiting factor was the inability to buy or sample electrodes because of the exorbitant price. While professionally manufactured electrodes would have greatly increased the resolution of our data sampling, we feel that the results we obtained from the electrodes we fabricated were more than satisfactory. Data shown in our graphs clearly show a subject's response to different questions asked as well as to visual stimulus.
Due to the wide disparity in our results, we could not get our software to recognize a lie. However, as humans, we were better able to analyze results and occasionally predicted where lies occurred. In hindsight, there are a few design aspects that we would change. Adding hardware to detect user pulse would increase the efficacy of the lie detection. Furthermore, we would improve upon our electrodes design to acquire better data.
Link: http://instruct1.cit.cornell.edu/courses/e...jw32/index.html