Vernier Acuity as a Test of Magnocellular Sensitivity |
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Authors: | Gokcen Gokce Osman Melih Ceylan Halil Ibrahim Altinsoy |
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Affiliation: | aDepartment of Ophthalmology, Sarıkamis Military Hospital, Kars, Turkey;bDepartment of Ophthalmology, Gulhane Military Medical Academy, Ankara, Turkey |
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Abstract: | Vernier acuity has been argued to provide a means to measure the integrity of the magnocellular visual pathway. This proposal is reviewed here and found to be inadequately supported for the following reasons: (1) the conditions under which Vernier acuity corresponds to magnocellular resolution differ from those used in psychophysical tests; (2) Vernier offsets can be induced by adaptation of cortical neurons; (3) factors other than the magnocellular system have the ability to interfere with Vernier acuity. Taken together, this review argues that Vernier acuity is at best limited as a selective test of magnocellular sensitivity. |
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Keywords: | schizophrenia vision magnocellular parvocellular visual cortex |
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