Modulation of activity in temporal cortex during generation of inner speech

TLDR

Monitoring one’s thoughts in the verbal modality depends on interaction between frontal speech‑generation and temporal speech‑perception areas. Functional magnetic resonance imaging was used to examine how activity in these regions varied with experimentally manipulated inner‑speech rates. Higher inner‑speech rates produced activation in left inferior frontal, right pre‑ and post‑central, and bilateral superior temporal gyri, indicating fronto‑temporal connectivity and supporting feed‑forward models of verbal perception modulation. Brain Mapping 16:219–227, 2002, © 2002 Wiley‑Liss, Inc.

Abstract

Abstract Monitoring one's thoughts (in the verbal modality) is thought to be critically dependent on the interaction between areas that generate and perceive inner speech in the frontal and temporal cortex, respectively. We used functional magnetic resonance imaging (fMRI) to examine the relationship between activity in these areas while the rate of inner speech generation was varied experimentally. The faster rate was associated with activation in the left inferior frontal gyrus, the right pre‐ and postcentral gyri and both superior temporal gyri. Thus, temporal cortical activation was associated with increasing the rate of covert articulation, in the absence of external auditory input, suggesting that there is effective fronto‐temporal connectivity. Furthermore, this may provide support for the existence of feed forward models, which suggest that activity in regions responsible for verbal perception is modulated by activity in areas that generate inner speech. Hum. Brain Mapping 16:219–227, 2002. © 2002 Wiley‐Liss, Inc.