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section_30_Group_4_Week7 - ECE 3280 Principles and Practice...

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ECE 3280 Principles and Practice of Biomedical Engineering Laboratory Electrooculogram (EOG) Section 30, Group 4 Felipe Zambrano (33%) Joshua Dean (33%) and KeithOldano (33%) Experiment Conducted October 14, 2011 Submitted October 21, 2011 Abstract The human eye can act as a spherical “battery” in which the cornea acts as a positive terminal and the retina as a negative terminal. Through these potential differences, it is possible to use electrodes to monitor eye movement for angles up to ±70°. Because the eye’s movement can be monitored, the experiment focused on trying to produce enough data in order to compare the EOGs of speed and attentive reading and be able to correlate the reading speed to the retention level. This was made possible by first attaching electrodes to a subject and monitoring the subject’s eye movement for speed and attentive reading and questioned about the reading material. The EOG’s signals from each reading were analyzed by comparing them to each other in terms of number of lines, number of words in each line and duration of the eye movement. The second part of the experiment focused on image scanning in which the subject’s eye pattern for locating a target was monitored and analyzed by plotting the trajectory tracings on an x-y axis
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and superimposing it on the actual images. Overall, it is possible to compare the speed and attentive EOG plots to each and the vertical eye movement over a five second time interval had a maximum and minimum voltages were -0.4mV and -0.9mV respectively while the horizontal eye movement had 0.4mV and 0.05mV respectively. Additionally, the trajectories of the eye movement displayed that the subject would remain focused on the target until the end of recording. The experiment provides interesting results about the trajectories involving searches with our eyes and the relationship between speed and attentive reading, which offer a good starting point for others would like to continue further testing. Introduction The focus of the lab involves performing an Electrooculogram(EOG). An EOG is a recording of changes in voltage that occur with eye position. The main concept involves the eye acting as a spherical “battery,” with the cornea and retina acting as the positive and negative terminals, respectively. The potential difference between these two terminals, or the cornea and retina, is within the range of 0.4-1mV. It is possible to measure angles the eye makes up through the placement of electrodes at both ends of the eye. The eye behaves as a moving dipole so as the cornea moves closer to the positive voltage potential electrode; the electrode will record the positive change on a voltage-time plot. Additionally, if the cornea is moving towards the negative voltage potential electrode, the electrode will also plot the negative changes on the same voltage- time scale. The electrodes can detect cornea movement up to ±70°.
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