Naoyuki Osaka - Academia.edu (original) (raw)

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Papers by Naoyuki Osaka

Displays, Jul 1, 1985

Abstract The effect of the display of a visual display unit (VDU) on visual fatigue was investiga... more Abstract The effect of the display of a visual display unit (VDU) on visual fatigue was investigated using the critical flicker frequency (CFF) paradigm. The results indicate that fatigue, as measured by CFF, varied as the VDU colour and eccentricity changed in the visual field. It was found that blue and red, that is, both extremes of the visible spectrum, strongly caused visual fatigue in the visual field when compared to green and yellow, that is, the middle range of the visible spectrum. Furthermore, for yellow and blue, VDU signal fatigue tended to decrease as the distance from the fovea increased. whereas for red and green, it increased by up to 10° in the periphery and then tended to decrease. The results indicate that yellow and green cause less fatigue in the periphery and fovea, respectively.

Seiri shinrigaku to seishin seirigaku, 2005

Annual Meeting Optical Society of America, 1986

The brightness of a chromatic flash is a joint function of its luminance and chromaticity.1 The c... more The brightness of a chromatic flash is a joint function of its luminance and chromaticity.1 The concomitant change in brightness and hue response with changes in luminance and chromaticity suggests a marked interaction between chromatic and achromatic coding systems. Bowen and Nissen1 did not find the wavelength-dependent Broca-Sulzer effect under hue substitution using nonunique hues, in which a flash represents chromaticity modulation without luminance modulation. However, the present data showed the chromatic Broca-Sulzer effect under both hue substitution (test and background with 5 cd/m2) and increments (background with 0.5 and 1.6 cd/m2) paradigms using unique hues as stimuli. The unique hues (blue, green, and yellow) were measured beforehand and they are the loci of equilibrium points for opponent coding systems. The methods employed were scaling and signal detection procedures. The results showed a wavelength-dependent Broca-Sulzer effect.

Nihon Shinri Gakkai Taikai happyo ronbunshu, Sep 8, 2020

Nihon Shinri Gakkai Taikai happyo ronbunshu, Sep 25, 2018

Perceptual and Motor Skills, Jun 1, 1980

Using a method of magnitude estimation, the exponent of the brightness power function has been de... more Using a method of magnitude estimation, the exponent of the brightness power function has been determined for functions describing the brightness of stimuli presented at the fovea and the following peripheral retinal locations: 10, 20, 30, 40, and 50° nasally eccentric to the fovea along the horizontal meridian of the right eye. The exponent for a 1-sec. flash was significantly increased as a function of increasing eccentricity at the lower luminance ranges whereas slightly increased at the higher luminance ranges.