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Spatial and/or temporal adjustments of scanning behavior to visibility changes

Investigated how scanning behavior in a letter search task adjusts to changes in spatial visibility created by different visual factors (i.e., viewing distance, interletter spacing, target-background similarity), using 9 observers. It was found that each of the 3 visual factors affected scanning behavior in a different way, either by changing its spatial parameter (saccade size), its temporal parameter (fixation duration), or both of them at the same time. Mechanisms underlying these effects are discussed. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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