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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Clifford, Colin W. G. Mareschal, Isabelle |
| Description | Author Affiliation: Mareschal I ( School of Psychology and Australian Centre of Excellence in Vision Science, University of Sydney, Sydney 2006, Australia. isabelle.mareschal@sydney.edu.au); |
| Abstract | Contextual effects abound in the real world; how we perceive an object depends on what surrounds it. A classic example of this is the tilt illusion (TI) whereby the presence of a surround shifts the perceived orientation of a target. Surprisingly, the magnitude and direction of this shift depend on the orientation difference between the target and surround: when their orientations are similar, the perceived difference is amplified and the target appears repelled in orientation from the surround (i.e., the TI). However, when their orientations are close to perpendicular, the difference is decreased and the target appears attracted in orientation toward the surround (i.e., the indirect TI). These misperceptions of orientation have revealed much about the underlying detectors involved in visual processing and how they interact with each other. What remains at stake are the levels of processing involved. To examine this, we designed a reverse-correlation technique whereby observers are blind to the orientation of the surround. We find that the TI and indirect TI occur reliably and over a similar time course, supporting the role of a single mechanism underlying orientation biases that operates in the early stages of visual processing before the conscious extraction of the surround orientation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 19 |
| Volume Number | 109 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2012-05-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Illusions Physiology Orientation Algorithms Contrast Sensitivity Figural Aftereffect Psychology Models, Psychological Optical Illusions Pattern Recognition, Visual Photic Stimulation Time Factors Visual Cortex Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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