https://scholars.lib.ntu.edu.tw/handle/123456789/571711
標題: | Lateral modulation of orientation perception in center-surround sinusoidal stimuli: Divisive inhibition in perceptual filling-in | 作者: | Lin Y.S CHIEN-CHUNG CHEN Greenlee M.W. |
關鍵字: | adaptation; human; photostimulation; physiology; procedures; spatial orientation; Adaptation, Physiological; Humans; Inhibition, Psychological; Orientation, Spatial; Photic Stimulation | 公開日期: | 2020 | 卷: | 20 | 期: | 9 | 起(迄)頁: | 1-18 | 來源出版物: | Journal of Vision | 摘要: | The perception of a target stimulus may be altered by its context. Perceptual filling-in is thought to be one example of lateral modulation, in which the percept of a central blank area is replaced by that of the surround. We investigated the mechanisms in eccentric vision underlying filling-in by selectively adapting the center (pedestal adapter), surround (annulus adapter), or both (disk adapter) in a sinusoidal grating and observed how the adaptation influences the orientation percept of a subsequently presented Gabor target, located at the same position as the adapter center. In a binary choice task, observers were to judge the orientation (clockwise or counterclockwise) of the target after adaptation. The tilt aftereffect (TAE), corresponding to an illusory tilt of a physically vertical Gabor target, depended both on the adapter orientation and the adapter type. The TAE, peaked between 10 degrees and 20 degrees adapter orientation, was strongest in the pedestal, followed by the disk, and weakest in the annulus adapter conditions. The difference between the disk and pedestal conditions implies lateral inhibition from the surround. Lacking physical overlap with the target, the annulus adapter nonetheless induced a small but significant TAE in the central area. The effect of filling-in on the TAE was estimated by comparing the results from trials with and without subjectively reported filling-in during adaptation to the annulus adapter. The TAE was greater when filling-in occurred during adaptation, suggesting a stronger lateral modulation effect on trials where filling-in was induced. The data were fit by a variant of a divisive inhibition model, in which the adaptation effect is captured by the increase of an additive constant in the denominator of the response function, whereas the surround modulation in the adapter is modeled by an excitatory sensitivity in the numerator. ? This work is licensed under a Creative Commons Attribution 4.0 International License. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85090510005&doi=10.1167%2fjov.20.9.5&partnerID=40&md5=40209fd92c1f81053a9608647302274f https://scholars.lib.ntu.edu.tw/handle/123456789/571711 |
ISSN: | 15347362 | DOI: | 10.1167/jov.20.9.5 |
顯示於: | 心理學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。