Functional neuroimaging of auditory hallucinations in schizophrenia
Font, M.; Parellada, E.; Fernández-Egea, E.; Bernardo, M.; Lomeña, F.
Actas Espanolas de Psiquiatria 31(1): 3-9
2003
ISSN/ISBN: 1139-9287 PMID: 12590366 Document Number: 558562
The neurobiological bases underlying the generation of auditory hallucinations, a distressing and paradigmatic symptom of schizophrenia, are still unknown in spite of in-depth phenomenological descriptions. This work aims to make a critical review of the latest published literature in recent years, focusing on functional neuroimaging studies (PET, SPECT, fMRI) of auditory hallucinations. Thus, the studies are classified according to whether they are sensory activation, trait and state. The two main hypotheses proposed to explain the phenomenon, external speech vs. subvocal or inner speech, are also explained. Finally, the latest unitary theory as well as the limitations the studies published are commented on. The need to continue investigating in this field, that is still underdeveloped, is posed in order to understand better the etiopathogenesis of auditory hallucinations in schizophrenia.