- Brodmann area 45
This area is also known as pars triangular (of the inferior frontal gyrus). In the human, it occupies the triangular part of
inferior frontal gyrus(H) and, surrounding the anterior horizontal limb of lateral sulcus(H), a portion of the orbital part of inferior frontal gyrus (H). Bounded caudally by the anterior ascending limb of lateral sulcus (H), it borders on the insulain the depth of the lateral sulcus.
Together with BA 44 it comprises
Broca's area, a region which is active in semantic tasks, such as semantic decision tasks (does this word represent an abstract or concrete entity?) and generation tasks (generate a verbassociated to a noun).
The precise role of BA45 in semantic tasks remains controversial. For some researchers, its role would be to subserve semantic retrieval or semantic working memory processes. Under this view, BA44 and BA45 would together guide recovery of semantic information and evaluate the recovered information with regards to the criterion appropriate to a given context [Cite journal
author = Gabrieli "et al."
year = 1998
title = The role of left prefrontal cortex in language and memory
volume = 95
pages = 906–913
doi = 10.1073/pnas.95.3.906
pmid = 9448258] [Cite journal
author = Buckner, R.
year = 1996
title = Contributions of specific prefrontal brain areas to long-term memory retrieval
Psychonomic Bulletin and Review
volume = 3
pages = 149–158] . A slightly modified account of this view is that activation of BA45 is needed only under controlled semantic retrieval, when strong stimulus-stimulus associations are absent [Wagner, A. D. (2002). Cognitive control and episodic memory: Contributions from prefrontal cortex. L. R. Squire & D. L. Schacter (Eds.). Neuropsychology of Memory (3rd ed.), pp. 174-192. New York: Guilford Press] . For other researchers, BA45's role is not restricted to semantics per se, but to all activities which require task-relevant representations from among competing representations [Cite journal
author = Thompson-Schill "et al."
year = 1999
title = Effects of repetition and competition on activity of left prefrontal cortex during word generation
journal = Neuron
volume = 23
pages = 513–522
doi = 10.1016/S0896-6273(00)80804-1] .
List of regions in the human brain
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