Functional neuroanatomy of visuo-spatial working memory in Turner syndrome.
Hum Brain Mapp
; 14(2): 96-107, 2001 Oct.
Article
em En
| MEDLINE
| ID: mdl-11500993
ABSTRACT
Turner syndrome (TS), a genetic disorder characterized by the absence of an X chromosome in females, has been associated with cognitive and visuo-spatial processing impairments. We utilized functional MRI (fMRI) to investigate the neural substrates that underlie observed deficits in executive functioning and visuo-spatial processing. Eleven females with TS and 14 typically developing females (ages 7-20) underwent fMRI scanning while performing 1-back and 2-back versions of a standard visuo-spatial working memory (WM) task. On both tasks, TS subjects performed worse than control subjects. Compared with controls, TS subjects showed increased activation in the left and right supramarginal gyrus (SMG) during the 1-back task and decreased activation in these regions during the 2-back task. In addition, decreased activation in the left and right dorsolateral prefrontal cortex (DLPFC) and caudate nucleus was observed during the 2-back task in TS subjects. Activation differences localized to the SMG, in the inferior parietal lobe, may reflect deficits in visuo-spatial encoding and WM storage mechanisms in TS. In addition, deficits in the DLPFC and caudate may be related to deficits in executive function during WM performance. Together these findings point to deficits in frontal-striatal and frontal-parietal circuits subserving multiple WM functions in TS.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Desempenho Psicomotor
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Percepção Espacial
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Síndrome de Turner
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Núcleo Caudado
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Córtex Cerebral
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Transtornos da Memória
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Memória de Curto Prazo
Tipo de estudo:
Etiology_studies
Limite:
Adolescent
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Child
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Female
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Humans
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article