Theoretical reproduction of spatial frequency characteristics for reaction time based on a spatiotemporal human vision model with accommodative dynamics
✍ Scribed by Toshikazu Matsui
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 219 KB
- Volume
- 82
- Category
- Article
- ISSN
- 1042-0967
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✦ Synopsis
A spatiotemporal human vision model has already been formulated based on two essential properties of the human vision system: the interdependent relation between blur of the retinal image and visual field, and the spatiotemporal response characteristics of two kinds of image processing pathways from the retinal ganglion cells to the brain (X-and Y-channels). Although the vision model theoretically reproduced spatiotemporal perceptual responses not only to still images but also to temporally changing images, such as flickering, drifting, and flashed images, it had the problem that discontinuities arose in the vision models temporal responses when the presented image was switched. This paper intends to improve further the versatility and applicability of the vision model, and formulates a nonstationary spatiotemporal human vision model capable of solving that problem by incorporating the dynamic characteristics of the visual accommodation mechanism into the previous vision model. As an example to demonstrate the expansion of the versatility, it is shown that the theoretical spatial frequency characteristics of reaction time (= perception time + time to press a switch after the perception) derived from the nonstationary vision model agree well with the experimentally measured ones. The result also introduces a possibility that there exists another factor (i.e., the accommodative dynamics) that influences the reaction time besides the conventionally proposed factor (i.e., the difference in signal transmission speed between the X-and Y-channels in human vision).