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The positive polarity of the human cornea was used to produce signals from marginal electrodes around the eyes. The potentials were amplified with dc networks which produced amplitude-time oscillographic tracings of the horizontal and vertical components of eyeball movement, and also controlled the deflectors of a cathode-ray oscilloscope (CRO) in such a way that the beam moved in the same way as the eyes. An automatic camera photographed the CRO face to produce two-dimensional electro-oculographic (EOG) plots of eyeball movement. Data thus obtained are used for an analysis of eye movements and fixations in a surveillance search task. The paper oscillographic tracings against time show (1) the number of fixations per unit of time, and (2) the duration of the fixations. The cathode-ray EOG shows (1) the order of fixations in search procedure, (2) the lengths of various saccadic jumps, and (3) the areas of neglect and concentration for 5-sec search periods on a circular field subtending 30° of visual angle.
Ford et al. (Sun,) studied this question.