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Titolo:
Impaired temporal contrast sensitivity in dyslexics is specific to retain-and-compare paradigms
Autore:
Ben-Yehudah, G; Sackett, E; Malchi-Ginzberg, L; Ahissar, M;
Indirizzi:
Hebrew Univ Jerusalem, Dept Psychol, IL-91905 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91905 -91905 Jerusalem, Israel Hebrew Univ Jerusalem, Dept Neurobiol, IL-91905 Jerusalem, Israel Hebrew Univ Jerusalem Jerusalem Israel IL-91905 -91905 Jerusalem, Israel
Titolo Testata:
BRAIN
, volume: 124, anno: 2001,
parte:, 7
pagine: 1381 - 1395
SICI:
0006-8950(200107)124:<1381:ITCSID>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
LATERAL GENICULATE LESIONS; BROAD-BAND CHANNELS; DEVELOPMENTAL DYSLEXIA; READING-DISABILITY; DISABLED READERS; VISUAL-SYSTEM; MAGNOCELLULAR PATHWAY; VISIBLE PERSISTENCE; SPATIAL-FREQUENCY; FUNCTIONAL ROLES;
Keywords:
dyslexia; contrast sensitivity; magnocellular; sequential presentation; temporal processing;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: Ahissar, M Hebrew Univ Jerusalem, Dept Psychol, IL-91905 Jerusalem, IsraelHebrew Univ Jerusalem Jerusalem Israel IL-91905 salem, Israel
Citazione:
G. Ben-Yehudah et al., "Impaired temporal contrast sensitivity in dyslexics is specific to retain-and-compare paradigms", BRAIN, 124, 2001, pp. 1381-1395

Abstract

Developmental dyslexia is a specific reading disability that affects 5-10%of the population, Recent studies have suggested that dyslexics may experience a deficit in the visual magnocellular pathway, The most extensively studied prediction deriving from this hypothesis is impaired contrast sensitivity to transient, low-luminance stimuli at low spatial frequencies, However the findings are inconsistent across studies and even seemingly contradictory, In the present study, we administered several different paradigms forassessing temporal contrast sensitivity, and found both impaired and normal contrast sensitivity within the same group of dyslexic participants. Under sequential presentation, in a temporal forced choice paradigm, dyslexics showed impaired sensitivity to both drifting and flickering gratings. However, under simultaneous presentation, with a spatial forced choice paradigm,dyslexics' sensitivity did not differ from that of the controls. Within each paradigm, dyslexics' sensitivity was poorer at higher temporal frequencies, consistent with the magnocellular hypothesis. These results suggest that a basic perceptual impairment in dyslexics may be their limited ability to retain-and-compare perceptual traces across brief intervals.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 04:26:31