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At small disparities, mean fusion response times were short and relatively stable but increased rapidly once the disparity reached a certain critical value. This 2-phase function implies the existence of 2 separate fusional mechanism: a rapid neurally based fusional process, which operates at small disparities, and a second mechanism involving reflexive vergence movements operating at disparities 2 to 3 times larger. Both mechanisms are highly influenced by spatial frequency, being 4 to 5 times more effective at low spatial frequencies. Additional experiments demonstrated that with compound stimuli, the fusion limit is not determined by the highest spatial frequency components (as had been reported previously) but, rather, can take advantage of the additional fusional range associated with low spatial frequencies. Such cooperation may be obvious only in the case of 2-dimensional stimuli. <\/jats:p>","DOI":"10.1518\/001872097778827098","type":"journal-article","created":{"date-parts":[[2006,11,8]],"date-time":"2006-11-08T22:46:33Z","timestamp":1163025993000},"page":"359-373","source":"Crossref","is-referenced-by-count":9,"title":["The Effects of Spatial Frequency on Binocular Fusion: From Elementary to Complex Images"],"prefix":"10.1177","volume":"39","author":[{"given":"Corinne","family":"Roumes","sequence":"first","affiliation":[{"name":"Centre d'Etudes et de Recherches de M\u00e9decine A\u00e9rospatiale, Br\u00e9tigny-sur-Orge, France"}]},{"given":"Justin","family":"Plantier","sequence":"additional","affiliation":[{"name":"Centre d'Etudes et de Recherches de M\u00e9decine A\u00e9rospatiale, Br\u00e9tigny-sur-Orge, France"}]},{"given":"Jean-Pierre","family":"Menu","sequence":"additional","affiliation":[{"name":"Centre d'Etudes et de Recherches de M\u00e9decine A\u00e9rospatiale, Br\u00e9tigny-sur-Orge, France"}]},{"given":"Simon","family":"Thorpe","sequence":"additional","affiliation":[{"name":"Centre de Recherche Cerveau et Cognition, Toulouse, France"}]}],"member":"179","published-online":{"date-parts":[[1997,9,1]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1068\/p090671"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1364\/JOSAA.4.001814"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1966.sp008107"},{"key":"atypb4","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1972.sp009944"},{"key":"atypb5","doi-asserted-by":"publisher","DOI":"10.1364\/JOSA.57.000819"},{"key":"atypb6","doi-asserted-by":"publisher","DOI":"10.1016\/0042-6989(80)90099-1"},{"key":"atypb7","doi-asserted-by":"publisher","DOI":"10.1136\/bjo.37.12.746"},{"key":"atypb8","doi-asserted-by":"publisher","DOI":"10.1068\/p140005"},{"volume-title":"Binocular vision and stereopsis.","year":"1995","author":"Howard, I. 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