Figure 3. Functional co-variation between the regions within Broca’s area and their networks.
(a) Co-variation between the two regions within Broca’s area and each of the remaining functional regions in the language and MD networks, based on regional fluctuations in the BOLD signal while listening to naturalistic stories [50–51]. Signal fluctuations (over time) in the language-selective IFG region correlate with fluctuations elsewhere in the language (but not MD) network; and, to a lesser extent, fluctuations in the domain-general IFG region correlate with those in other left-hemispheric MD regions. (b) Co-variation between the two regions within Broca’s area and each of the remaining functional regions in the language and MD networks based on regional effect sizes across individuals [49]. Individuals with stronger (weaker) responses in the language-selective region are likely to also exhibit strong (weak) responses in other language (but not MD) regions, and vice-versa for the domain-general region.