Increased neural efficiency in the temporal association cortex as the result of semantic task repetition.
Hum Brain Mapp
; 29(8): 922-30, 2008 Aug.
Article
em En
| MEDLINE
| ID: mdl-17674355
ABSTRACT
We examined the effect of semantic task repetition and of alternating between tasks on cerebral blood flow in three H(2) (15)O positron emission tomography experiments. We found that repeatedly performing semantic tasks resulted in a reduction in cerebral blood flow to the left temporal association cortex similar to that found in priming experiments even though here there was no repetition of stimuli. Although the same effect was found in two different tasks (word meaning judgments and picture naming), it was only present when the same task was repeated on consecutive scans and not when the subjects alternated from scan to scan between tasks. We propose that there is a neural efficiency which develops in the association cortex of the temporal lobe as a result of repeatedly performing a semantic task. This efficiency is abolished by interruptions such as performing a different task.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Prática Psicológica
/
Desempenho Psicomotor
/
Semântica
/
Lobo Temporal
/
Neurônios
Tipo de estudo:
Risk_factors_studies
Limite:
Aged
/
Aged80
/
Female
/
Humans
/
Male
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article