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1994 Volume 13 Issue 1 Pages
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Article type: Cover
1994 Volume 13 Issue 1 Pages
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Kenji SUSAMI
Article type: Article
1994 Volume 13 Issue 1 Pages
1-10
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A visual information process that induces motion-in-depth aftereffects was studied. In experiment 1, two vertical lines moving away from each other (antiphase component) in a saw-tooth waveform fashion were presented as the adaptation stimulus. After adaptation, (1) two static lines or the vertical edges of a square were perceived to be approaching each other. Subsequently, (2) these stimuli were perceived to be moving away from the head (motion-in-depth aftereffect). (3) The motion aftereffect (MAE) was induced on a single-line stimulus consisting of the antiphase component. In experiments 2 and 3, the two lines moving along the direction of the antiphase component were alternatively presented with various temporal sequences. It was found that (4) the approaching movement was induced by the alternative adaptation of two moving stimuli. Consequently, (1), (3), and (4) could be explained in terms of the adaptation of motion detectors responding to the frontal-parallel motion. The motion-in-depth aftereffect of (2) induced by the adaptation of the antiphase component, however, could not be explained in terms of MAE. These results suggest that our visual system contains a mechanism that responds to the antiphase component included in a changing-size image of motion-in-depth.
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Masahiro NOCHI, Reiko YAMADA, Shusuke KUSANO
Article type: Article
1994 Volume 13 Issue 1 Pages
11-15
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We report a patient who developed hemi-spatial neglect and visuo-constructive disability caused by cerebral infarctions in the right parietal and occipital lobes. Her writing was characterized by omissions of the left strokes in several kana-characters as well as symptoms of spatial agraphia. When asked to count the number of strokes in kana-characters from memory, she also made a report that suggested omissions of the left strokes in the same characters. Based on those observations, we infer that the left hemi-spatial neglect affected the one higher level writing process which involves visual representation of kana-characters. Also, we hypothesize that the disorder on that level manifested itself in her handwriting because her visuo-constructive disability prevented the motor component of the writing process from compensating for that influence of hemi-spatial neglect.
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Hiroshige TAKEICHI
Article type: Article
1994 Volume 13 Issue 1 Pages
17-44
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Three points are emphasized in reviewing the literature on illusory contours. First, illusion of surface properties such as apparent contrast or depth stratification should be discussed independently of the contour perception itself. Second, perception of illusory contours should be discussed basically in terms of a stimulus-driven phenomenon although cognitive factors such as set or memory affects perception of illusory contours. Finally, perception of illusory contours should be regarded as shape perception of hidden figures by occlusion, using viewpoint-invariants such as parallel edges or collinear terminators and making probabilistic likelihood estimation. The final point explains some singular aspects of illusory contours, such as specificity of luminance information.
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Article type: Appendix
1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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Shinichi Asakawa, Michiko Nakano
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1994 Volume 13 Issue 1 Pages
53-
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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1994 Volume 13 Issue 1 Pages
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