Biomedical subjects
Publications and source records attributed to N Osaka.
Using a 700-nm light-emitting diode, the minimum inter-pulse interval between two successively flashing pulses presented to 21 retinal loci along horizontal and vertical meridian were measured. The results showed inter-pulse interval changed as a W-shaped function of eccentricity on both meridians.
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Explore the source record for details and available documents.
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Using targets of four sizes between 18' and 116' at a fixed luminance of 5.8 cd/m2, human visual reaction times (RT) were measured on a circle at 30 degrees eccentric to the fovea. A foveal and 12 peripheral retinal loci were explored, covering the range between 0 degrees and 330 degrees in steps of 30 degrees units on a circle about the fovea. RT decreased significantly by the stimulation to the quadrant retinal loci between nasal and superior side. RT decreased as a function of increasing target size and the amount of decrement was relatively larger in the periphery than in the fovea.
Four target sizes between 15 and 120 min. of arc with six luminance levels covering the range between 398.1 and 1.26 cd/m2 in steps of .5 log units were presented to 0, 20, 40, 60, and 80 degrees nasal retinal loci. In both peripheral and foveal viewing, magnitude estimates to apparent brightness judged by 12 Ss changed as a function of target size and luminance. The exponent of the power function was not dependent on retinal loci but on target size. However, when target size increased, the apparent brightness was slightly greater with peripheral viewing than with foveal viewing.
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