| Presentation | 2005/1/17 Spatio-temporal frequency characteristics of perceptual filling-in for an annular object Masae YOKOTA, Yasunari YOKTOA, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | The ultimate aim of this study is to elucidate the mechanism inducing perceptual filling-in from the viewpoint of spatio-temporal frequency characteristics in vision. Time to filling-in is not a suitable criterion for representing facilitation of filling-in because filling-in time does not distinguish among cases : filling-in is rapidly induced by a certain mechanism and a filling-in target is essentially difficult to distinguish from its surrounding. Therefore, we introduced a new criterion - the attenuation factor of distinguishability of a filling-in target from its surroundings-to represent facilitation of filling-in. This study investigates the attenuation factor as a function of the spatio-temporal frequency of surrounding dynamic textures. Filling-in time was measured for various dynamic textures characterized by different spatio-temporal frequencies (EX1). An annular filling-in target centered at a fixation point was adopted to stabilize the subject's fixation. The target was presented at 17 [deg] eccentricity of the subject's monocular visual field. We measured visual sensitivity for each dynamic texture used in EX1 (EX2). The attenuation factor, which reflects facilitation of filling-in, was estimated using the measured filling-in time and visual sensitivity for each dynamic texture. The estimated attenuation factor, when represented as a function of spatio-temporal frequency, has a peak and a concavity. Those frequencies respectively correspond to those of sensitivity functions for M and P channels in LGN. If neural activation in primary visual cortex propagates from the central visual field toward the peripheral filling-in target and if stronger activation propagates more quickly, a dynamic texture that induces stronger activation will greatly facilitate filling-in. For that reason, a dynamic texture having higher sensitive spatio-temporal frequency for M channel greatly facilitates filling-in, but not for P channel. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Filling-in / Annular Object / Spatio-Temporal Frequency Characteristics / Perceptual Power |
| Paper # | NC2004-115 |
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| Committee | NC |
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| Conference Date | 2005/1/17(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Neurocomputing (NC) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Spatio-temporal frequency characteristics of perceptual filling-in for an annular object |
| Sub Title (in English) | |
| Keyword(1) | Filling-in |
| Keyword(2) | Annular Object |
| Keyword(3) | Spatio-Temporal Frequency Characteristics |
| Keyword(4) | Perceptual Power |
| 1st Author's Name | Masae YOKOTA |
| 1st Author's Affiliation | Nagoya Bunri University() |
| 2nd Author's Name | Yasunari YOKTOA |
| 2nd Author's Affiliation | Faculty of Engineering, Gifu University |
| Date | 2005/1/17 |
| Paper # | NC2004-115 |
| Volume (vol) | vol.104 |
| Number (no) | 585 |
| Page | pp.pp.- |
| #Pages | 6 |
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