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Its size depends partly on physiological limitations, but its adaptability is largely determined by cognitive factors. For example, changes in the FFV often reflect the demands of a given task: it shrinks with high task demands and expands with easier tasks. Here, we placed an upright or inverted target among distractors. We manipulated the visibility of the search array during gaze-contingent search with small (6\u00b0), medium (12\u00b0) and large (18\u00b0) apertures. Aperture size affected performance, improving it when it increased from 6\u00b0 to 12\u00b0, but not from 12\u00b0 to 18\u00b0, suggesting an upper bound of the 'natural' aperture for this specific task. 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