{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T06:28:02Z","timestamp":1777876082552,"version":"3.51.4"},"reference-count":40,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2002,1,1]],"date-time":"2002-01-01T00:00:00Z","timestamp":1009843200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Perception"],"published-print":{"date-parts":[[2002,1]]},"abstract":"<jats:p>Stereoanomaly is the failure to see differences in depth when the viewer is presented with stimuli having different magnitudes of stereoscopic disparity. In the absence of eye movements, everyone suffers from stereoanomaly for extremely large disparities. Typically, such disparities are seen at the same depth as monocular stimuli. However, about 30% of the population exhibit some form of stereoanomaly even for very small disparities, provided eye movements are avoided. In some cases, the sign of the disparity will be confused, and the perceived depth will be incorrectly seen as \u2018behind\u2019 rather than \u2018in front of\u2019 the fixation point, for example. Because anomalies provide useful information about perceptual mechanisms, tests that measure and quantify the extent of a blindness are important investigative tools for research. Here we offer two easy-to-administer tests for stereoanomaly. The first test is based on depth judgments of two bars relative to a fixation point. The second test involves judgments of volumetric stimuli, seen stereoscopically. In each case, subjects indicate depth by setting a rectangle (with fixed base) to match the perceived depth. Although both tests are correlated, some differences in stereo processing are seen, depending upon whether or not the stimuli are presented near the point of fixation.<\/jats:p>","DOI":"10.1068\/p3303","type":"journal-article","created":{"date-parts":[[2002,8,24]],"date-time":"2002-08-24T17:28:38Z","timestamp":1030210118000},"page":"51-64","source":"Crossref","is-referenced-by-count":41,"title":["A Planar and a Volumetric Test for Stereoanomaly"],"prefix":"10.1177","volume":"31","author":[{"given":"Raymond","family":"van Ee","sequence":"first","affiliation":[{"name":"Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, NE20-451, Cambridge, MA 02139-4307, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Whitman","family":"Richards","sequence":"additional","affiliation":[{"name":"Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, NE20-451, Cambridge, MA 02139-4307, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2002,1,1]]},"reference":[{"key":"bibr1-p3303","doi-asserted-by":"publisher","DOI":"10.1016\/0042-6989(82)90108-0"},{"key":"bibr2-p3303","doi-asserted-by":"publisher","DOI":"10.1113\/jphysiol.1970.sp009296"},{"key":"bibr3-p3303","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1126\/science.187.4173.269","volume":"187","author":"Breitmeyer 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