H. Karbe et al., CEREBRAL NETWORKS AND FUNCTIONAL BRAIN ASYMMETRY - EVIDENCE FROM REGIONAL METABOLIC CHANGES DURING WORD REPETITION, Brain and language (Print), 63(1), 1998, pp. 108-121
Citations number
45
Categorie Soggetti
Language & Linguistics","Psychology, Experimental",Neurosciences
Word repetition causes a significant bilateral metabolic increase in b
oth superior temporal cortices. Frontal speech areas are less activate
d despite then presumable speech competence. We investigated in this s
tudy the relationship between frontal and temporal cortical areas duri
ng word repetition. We measured regional cerebral metabolic rates of g
lucose (CMRGI) in 15 normal subjects with positron emission tomography
(PET) at rest and during word repetition. Significant correlations co
nnected frontal and temporal areas of both hemispheres, notwithstandin
g their different levels of mean metabolic activation. The left planum
temperate was a hub of significant interregional correlations, in con
trast to its contralateral mate. This study indicates that an asymmetr
ic network of significant connections orchestrates the speech-relevant
cortical areas according to the actual needs of speech processing. (C
) 1998 Academic Press.