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- W2019023757 abstract "Adaptive behavior guided by unconscious visual cues occurs in patients with various kinds of brain damage as well as in normal observers, all of whom can process visual information of which they are fully unaware [1Weiskrantz L Blindsight: A Case Study and Implications. Oxford University Press, Oxford1986Google Scholar, 2Humphrey K Goodale MA Corbetta M Aglioti S The McCollough effect reveals orientation discrimination in a case of cortical blindness.Curr Biol. 1995; 5: 545-551Abstract Full Text Full Text PDF PubMed Scopus (35) Google Scholar, 3Driver J Mattingley JB Parietal neglect and visual awareness.Nat Neurosci. 1998; 1: 17-22Crossref PubMed Scopus (344) Google Scholar, 4Tomaiuolo F Ptito M Marzi CA Paus T Ptito A Blindsight in hemispherectomized patients as revealed by spatial summation across the vertical meridian.Brain. 1997; 120: 795-803Crossref PubMed Scopus (109) Google Scholar, 5Goodale MA Milner AD Jakobson LS Carey DP A neurological dissociation between perceiving objects and grasping them.Nature. 1991; 349: 154-156Crossref PubMed Scopus (930) Google Scholar, 6Farah MJ Feinberg TE Consciousness of perception after brain damage.Semin Neurol. 1997; 17: 145-152Crossref PubMed Scopus (27) Google Scholar, 7Meeres SL Graves RE Localization of unseen visual stimuli by humans with normal vision.Neuropsychologia. 1990; 12: 1231-1237Crossref Scopus (48) Google Scholar, 8Kolb FC Braun J Blindsight in normal observers.Nature. 1995; 377: 336-338Crossref PubMed Scopus (147) Google Scholar]. Little is known on the possibility that unconscious vision is influenced by visual cues that have access to consciousness [[9]Kentridge RW Heywood CA Weiskrantz L Effects of temporal cueing on residual visual discrimination in blindsight.Neuropsychologia. 1999; 37: 479-483Crossref PubMed Scopus (52) Google Scholar]. Here we report a ‘blind’ letter discrimination induced through a semantic interaction with conscious color processing in a patient who is agnosic for visual shapes, but has normal color vision and visual imagery. In seeing the initial letters of color names printed in different colors, it is normally easier to name the print color when it is congruent with the initial letter of the color name than when it is not [[10]Regan J Involuntary automatic processing in color-naming tasks.Percept Psychophys. 1978; 24: 130-136Crossref PubMed Scopus (38) Google Scholar]. The patient could discriminate the initial letters of the words ‘red’ and ‘green’ printed in the corresponding colors significantly above chance but without any conscious accompaniment, whereas he performed at chance with the reverse color–letter mapping as well as in standard tests of letter reading. We suggest that the consciously perceived colors activated a representation of the corresponding word names and their component letters, which in turn brought out a partially successful, unconscious processing of visual inputs corresponding to the activated letter representations." @default.
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- W2019023757 title "Unconscious letter discrimination is enhanced by association with conscious color perception in visual form agnosia" @default.
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