空間周波数順応が視力に与える影響:シミュレーション研究と心理物理研究 An Influence that Spatial Frequency Adaptation Causes on Visual Acuity:Simulation Studies and Psychophysical Investigations

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Abstract

In the human visual system, the visual stimuli are first received and preprocessed in the retina and then transmitted to the cerebral visual cortex via the lateral geniculate body. It is reported by Campbell and his associates that the cerebral visual cortex conducts processing consisting of spatial-frequency-and-orientation-specific multiple narrow-band channels. It is also reported that spatial-frequency-and-orientation-specific visual stimuli cause adaptations in the corresponding channels, resulting in the reductions of visual sensitivity around the frequency range.<br> In this article, we focused our attention on the multiple channel theory that Campbell et al. proposed, and constructed a model of the human visual system that had more than one frequency channel. We have conducted various simulation studies using the above model. The results are compared with psychophysical data. In the course of the simulation studies using Landolt rings, to measure visual acuity, we happened to find spatial-frequency-specific adaptations will cause paradoxical transient improvements in visual acuity. Therefore we conducted perceptual experiments to see if the improvements in visual acuity take place after spatial-frequency-specific visual adaptation. As a whole, paradoxical transient improvements in visual acuity seem to take place.

Journal

  • IEEJ Transactions on Electronics, Information and Systems

    IEEJ Transactions on Electronics, Information and Systems 122(4), 585-591, 2002

    The Institute of Electrical Engineers of Japan

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