WOBIB: 185 - Paulesu, et al. (1997) Functional heterogen ...
 
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Eraldo Paulesu; Ben Goldacre; Paola Scifo; Stefano F. Cappa; Maria Carla Gilardi; Isabella Castiglioni; Daniela Perani; Frruccio Fazio. Functional heterogeneity of left inferior frontal cortex as revealed by fMRI. NeuroReport 8(8):2011-2017, 1997. PMID: 9223094. FMRIDCID: . WOBIB: 185.

USING functional magnetic resonance imaging (fMRI), we mapped brain activity in six normal volunteers during two silent verbal fluency tasks, one with a phonemic (letter) cue and one with a semantic (category) cue. In comparison with resting state, both tasks activated the anterior triangular portion of the left inferior frontal gyrus (IFG or F3, for third frontal gyrus) and the left thalamus. There were also areas activated in one task but not in the other: the posterior opercular portion of the left IFG for phonemic fluency, and the left retrosplenial region for semantic fluency. Our findings concur with normal psychophysical data and neuropsychological observations to suggest the recruitment of two overlapping but dissociable systems for the two tasks, and demonstrate functional heterogeneity within the left IFG (Broca's area), where the opercular portion is responsible for obtaining access to words through a phonemic/articulatory route.

Asymmetry: -0.99742 (left: -1, right: +1)

VRML2 file (97 Kb)

1 Semantic verbal fluency versus rest. Generate words covertly without articulation cued with a broad category, such as animals, fruits and kitchen utensils. WOEXP: 581.
2 Phonemic verbal fluency versus rest. Generate words covertly without articulation cued with a given letter. WOEXP: 582.
3 Phonemic fluency versus semantic fluency. Generate words covertly without articulation cued with a given letter versus cued from a category. WOEXP: 583.
4 Semantic fluency versus phonemic fluency. Generate words covertly without articulation cued with a broad category, such as animals, fruits and kitchen utensils versus cued with a letter. WOEXP: 584.
5 Rest versus word generation. Resting with eyes closed versus generate words covertly without articulation cued with letter or category. WOEXP: 585.


corner cube of WOBIB_185

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