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Functional characterization and differential coactivation patterns of two
cytoarchitectonic visual areas on the human posterior fusiform gyrus
#MMPMID24038902
Caspers J
; Zilles K
; Amunts K
; Laird AR
; Fox PT
; Eickhoff SB
Hum Brain Mapp
2014[Jun]; 35
(6
): 2754-67
PMID24038902
show ga
The ventral stream of the human extrastriate visual cortex shows a considerable
functional heterogeneity from early visual processing (posterior) to higher,
domain-specific processing (anterior). The fusiform gyrus hosts several of those
"high-level" functional areas. We recently found a subdivision of the posterior
fusiform gyrus on the microstructural level, that is, two distinct
cytoarchitectonic areas, FG1 and FG2 (Caspers et al., Brain Structure & Function,
2013). To gain a first insight in the function of these two areas, here we
studied their behavioral involvement and coactivation patterns by means of
meta-analytic connectivity modeling based on the BrainMap database
(www.brainmap.org), using probabilistic maps of these areas as seed regions. The
coactivation patterns of the areas support the concept of a common involvement in
a core network subserving different cognitive tasks, that is, object recognition,
visual language perception, or visual attention. In addition, the analysis
supports the previous cytoarchitectonic parcellation, indicating that FG1 appears
as a transitional area between early and higher visual cortex and FG2 as a
higher-order one. The latter area is furthermore lateralized, as it shows strong
relations to the visual language processing system in the left hemisphere, while
its right side is stronger associated with face selective regions. These findings
indicate that functional lateralization of area FG2 relies on a different pattern
of connectivity rather than side-specific cytoarchitectonic features.
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