Fig. 9.

Shared neural substrate between overt and covert speech. Shared activation between overt and covert speech is located primarily in the superior temporal gyrus, premotor cortex, and primary motor cortex [51]. Shared activation can also be observed in the frontal eye fields and dorsolateral prefrontal cortex; however, this may be indicative of visual processing and decision making [51]. Figure reused with permission from Ref. [51]