Real-world size coding of solid objects, but not 2-D or 3-D images, in visual agnosia patients with bilateral ventral lesions.
Object recognition
Real-world objects
Real-world size
Two-dimensional images
Visual form agnosia
Journal
Cortex; a journal devoted to the study of the nervous system and behavior
ISSN: 1973-8102
Titre abrégé: Cortex
Pays: Italy
ID NLM: 0100725
Informations de publication
Date de publication:
10 2019
10 2019
Historique:
received:
08
09
2018
revised:
29
01
2019
accepted:
12
02
2019
pubmed:
17
4
2019
medline:
13
11
2020
entrez:
17
4
2019
Statut:
ppublish
Résumé
Patients with visual agnosia show severe deficits in recognizing two-dimensional (2-D) images of objects, despite the fact that early visual processes such as figure-ground segmentation, and stereopsis, are largely intact. Strikingly, however, these patients can nevertheless show a preservation in their ability to recognize real-world objects -a phenomenon known as the 'real-object advantage' (ROA) in agnosia. To uncover the mechanisms that support the ROA, patients were asked to identify objects whose size was congruent or incongruent with typical real-world size, presented in different display formats (real objects, 2-D and 3-D images). While recognition of images was extremely poor, real object recognition was surprisingly preserved, but only when physical size matched real-world size. Analogous display format and size manipulations did not influence the recognition of common geometric shapes that lacked real-world size associations. These neuropsychological data provide evidence for a surprising preservation of size-coding of real-world-sized tangible objects in patients for whom ventral contributions to image processing are severely disrupted. We propose that object size information is largely mediated by dorsal visual cortex and that this information, together with detailed representation of object shape which is also subserved by dorsal cortex, serve as the basis of the ROA.
Identifiants
pubmed: 30987739
pii: S0010-9452(19)30101-7
doi: 10.1016/j.cortex.2019.02.030
pmc: PMC6733679
mid: NIHMS1523555
pii:
doi:
Types de publication
Case Reports
Journal Article
Research Support, N.I.H., Extramural
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
555-568Subventions
Organisme : NEI NIH HHS
ID : R01 EY026701
Pays : United States
Informations de copyright
Copyright © 2019 Elsevier Ltd. All rights reserved.
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