Bridging phenomenology and neural mechanisms of inner speech: ALE meta-analysis on egocentricity and spontaneity in a dual-mechanistic framework
- Resource Type
- article
- Authors
- Jaydan Pratts; Gorana Pobric; Bo Yao
- Source
- NeuroImage, Vol 282, Iss , Pp 120399- (2023)
- Subject
- Inner speech
Corollary discharge
Perceptual simulation
Meta-analysis
GingerALE
Neurosciences. Biological psychiatry. Neuropsychiatry
RC321-571
- Language
- English
- ISSN
- 1095-9572
The neural mechanisms of inner speech remain unclear despite its importance in a variety of cognitive processes and its implication in aberrant perceptions such as auditory verbal hallucinations. Previous research has proposed a corollary discharge model in which inner speech is a truncated form of overt speech, relying on speech production-related regions (e.g. left inferior frontal gyrus). This model does not fully capture the diverse phenomenology of inner speech and recent research suggesting alternative perception-related mechanisms of generation. Therefore, we present and test a framework in which inner speech can be generated by two separate mechanisms, depending on its phenomenological qualities: a corollary discharge mechanism relying on speech production regions and a perceptual simulation mechanism within speech perceptual regions. The results of the activation likelihood estimation meta-analysis examining inner speech studies support the idea that varieties of inner speech recruit different neural mechanisms.