The dichoptic viewing paradigm: Do the eyes have it?

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Reviews and analyzes the 2-part logic underlying the use of the dichoptic viewing procedure as a “psychoanatomical” tool by which to infer the retinal or cortical locus of critical processes for the perception of some visual phenomenon. Serious logical weaknesses are identified in both sides of the dichoptic argument: the inference of dominant retinal processes from unsuccessful dichoptic viewing or dominant cortical processes from successful dichoptic viewing. Specific examples from the visual literature are used to demonstrate the potential confounding of each of the variables suggested in this critique. The dichoptic viewing procedure tends to be employed in too uncritical a manner, and the usual interpretations of studies that have used this procedure as the sole technique by which to infer the general locus of a given visual phenomenon may be seriously in error. (72 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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