Open AccessThe fovea is essential for peripheral vision: The effect of foveal distractors on extra-foveal perception
Author(s) -
Kimberly B. Weldon,
Alexandra Woolgar,
Ani. Rich,
Mark A. Williams
Publication year - 2015
Publication title -
journal of vision
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.126
H-Index - 113
ISSN - 1534-7362
DOI - 10.1167/15.12.609
Subject(s) - foveal , stimulus (psychology) , perception , psychology , fovea centralis , peripheral vision , neuroscience , visual perception , cognitive psychology , computer science , computer vision , ophthalmology , medicine , retinal
Neuroimaging evidence indicates that visual information about objects in the periphery is fed back to foveal retinotopic cortex in a new and separate representation. Additionally, delayed disruption of foveal confluence via transcranical magnetic stimulation impairs discrimination of objects in the periphery, suggesting this feedback mechanism is essential for extra-foveal perception. In this study, we developed a behavioural paradigm to further explore the nature of this feedback mechanism and provide a behavioural measure. Participants performed a discrimination task on objects in the periphery while fixating centrally. A visual distractor presented at the fovea 100ms after presentation of the peripheral stimulus disrupted perceptual discrimination more than visual distractors presented at other stimulus onset asynchronies (SOAs). In a control experiment, a visual distractor presented elsewhere in the periphery at the same SOAs did not impair behavioural performance. These results corroborate previous research showing foveal retinotopic cortex is essential for extra-foveal perception. This study also demonstrates a new paradigm for investigating the nature of the foveal feedback phenomenon.1 page(s