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Titolo:
ABNORMAL PROCESSING OF VISUAL-MOTION IN DYSLEXIA REVEALED BY FUNCTIONAL BRAIN IMAGING
Autore:
EDEN GF; VANMETER JW; RUMSEY JM; MAISOG JM; WOODS RP; ZEFFIRO TA;
Indirizzi:
NIMH,SECT FUNCT BRAIN IMAGING,NIH BETHESDA MD 20892 NIMH,CHILD PSYCHIAT BRANCH,NIH BETHESDA MD 20892 NIH,LAB DIAGNOST RADIOL RES,OD BETHESDA MD 20892 SENSOR SYST INC STERLING VA 20164 UNIV CALIF LOS ANGELES,SCH MED,DEPT NEUROL LOS ANGELES CA 90098
Titolo Testata:
Nature
fascicolo: 6586, volume: 382, anno: 1996,
pagine: 66 - 69
SICI:
0028-0836(1996)382:6586<66:APOVID>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEVELOPMENTAL DYSLEXIA; CORTEX; ORGANIZATION; COLOR; CONNECTIONS; PERCEPTION; MOVEMENT; VISION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
G.F. Eden et al., "ABNORMAL PROCESSING OF VISUAL-MOTION IN DYSLEXIA REVEALED BY FUNCTIONAL BRAIN IMAGING", Nature, 382(6586), 1996, pp. 66-69

Abstract

IT is widely accepted that dyslexics have deficits in reading and phonological awareness(1,2), but there is increasing evidence that they also exhibit visual processing abnormalities that may be confined to particular portions of the visual system(3,4). In primate visual pathways, inputs from parvocellular or magnocellular layers of the lateral geniculate nucleus remain partly segregated in projections to extrastriate cortical areas specialized for processing colour and form versus motion(5-10), In studies of dyslexia, psychophysical(3) and anatomical(4) evidence indicate an anomaly in the magnocellular visual subsystem, To investigate the pathophysiology of dyslexia, we used functional magnetic resonance imaging (fMRI) to study visual motion processing in normal and dyslexic men, In all dyslexics, presentation of moving stimuli failed to produce the same task-related functional activation in area V5/MT (part of the magnocellular visual subsystem) observed in controls, In contrast, presentation of stationary patterns resulted in equivalent activations in V1/V2 and extrastriate cortex in both groups, Although previous studies have emphasized language deficits, our data reveal differences in the regional functional organization of the cortical visual system in dyslexia.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 03:51:27