Quantitative Measurement of Sensitivity in Peripheral Visual field

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We use the fovea when we look at an object carefully, but we use the peripheral visual field when we see our environmental world surrounding us. The visual properties are very different between the fovea and the peripheral visual field. Therefore it is important and necessary to consider characteristics of the peripheral visual field in order to obtain good reality in a large picture presented in a large-size display. We measured 1. visual space localization and displacement sensitivity during saccade and pursuit eye movements, 2. temporal contrast sensitivity function, 3. categorical color perception, 4. vection as an index of reality sensation, in the peripheral visual field by psychophysical methods in order to quantify sensitivity of the peripheral vision. Our research achievement is summarized as follows.1. Apparatuses were built to present a large stimulus synchronizing eye movement in the peripheral visual filed. The results show that stimulus at the target position in the peripheral visual field was better discriminated before saccade, distortion of localization was observed during saccade, but not observed during pursuit eye movements, and stimulus displacement sensitivity in the entire visual field was degraded.2. Temporal contrast sensitivity function at the fovea was almost equal to that at the 30 and 40 deg in the nasal visual field in higher temporal frequencies, and was lower in the lower temporal frequencies when the stimulus size and intensity were equated by the MF-scaling.3. Categorical color appearance was almost the same between at the fovea and in the peripheral visual field although color appears continuously different across visual field.4. Vection strength was measured with magnitude estimation and latency as a function of the stimulus size. It is shown that vection strength increased up to 80 deg of the stimulus size, and that vection strength was correlated well with barycentric fluctuation.