2004年7月
Contrast-reversing global-motion stimuli reveal local interactions between first- and second-order motion signals
VISION RESEARCH
- ,
- 巻
- 44
- 号
- 16
- 開始ページ
- 1941
- 終了ページ
- 1950
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.visres.2004.03.016
- 出版者・発行元
- PERGAMON-ELSEVIER SCIENCE LTD
Motion perception appears to be mediated by, at least, two systems: a first-order and a second-order system. To investigate the degree of interaction between these systems, we used a contrast-reversing global-motion Stimulus in which the signal dots reverse their contrast polarity as they move. In response to such a stimulus, fullwave-rectifying second-order units would signal motion in the displacement direction and first-order units would signal motion in the opposite direction (reverse-phi motion). If these signals were of equal strength, then any inhibitory interaction between them would lead to motion nulling. Such a situation would account for the failure to perceive coherent motion with Such a stimulus in a previous study [Vis. Res. 34 (1994) 2849]. In order to test for this possibility we manipulated the stimulus in order to reduce the strength of the second-order response relative to the first-order response. This was achieved by: decreasing dot contrast; increasing stimulus eccentricity; and increasing dot speed. These manipulations resulted in an increase in the perception of (first-order mediated) reverse-phi motion. We conclude that interaction between first- and second-order motion signals occur at the local-motion-pooling level. (C) 2004 Elsevier Ltd. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.visres.2004.03.016
- ISSN : 0042-6989
- PubMed ID : 15145687
- Web of Science ID : WOS:000221859500010