production of overt or imagined speech, although the individual tasks varied from repetition of printed or heard nouns to self-paced counting to narrative speech, and subtractions often did not remove the semantic component of tasks. The studies differentiated among the areas of Ml-mouth and BA 46/47 in most cases; therefore, averaging in activation from these distinct areas did not shift the reported coordinates. Activation of Broca's area proper has been observed in other nonlanguage tasks, such as accessing verbal working memory and overt and imagined movement, so its function may need to be generalized from articulatory planning to somatosensory motor planning.

Table II

Meta-analysis of Functional Imaging Literature Showing Activation in Broca's Area

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