Jaynes’s Neurological Model

In his theory, Julian Jaynes describes the role hallucinations played in an earlier mentality called the bicameral mind, prior to the development of subjective consciousness. Jaynes’s neurological model for the bicameral mind predicts that auditory hallucinations would be generated by the language areas in the right temporal lobe and be “heard” or processed by the left. This prediction has been now been verified as accurate by numerous studies. Jaynes was not only correct about the neurology of auditory hallucinations, but decades ahead of his time. Below is a small sample of research supporting this aspect of Jaynes’s theory (highlighted text calls attention to areas of the right hemisphere that Jaynes predicted would play a role in hallucinations). See also: Right Hemisphere & Language



Language Lateralization and Psychosis

Language Lateralization and Psychosis
Sommer, Iris E.C. and René S. Kahn (eds.) (Cambridge University Press, 2009)
In 1861 Paul Broca discovered that, in most individuals, the left hemisphere of the brain is dominant for language. Taking language as an example, the first part of this book explains the normal development of bodily asymmetry and lateralization, its association with hand preference, genetic aspects, geographical differences and the influence of gender. The coverage then moves on to review the association between language lateralization and psychosis, describing findings in patients with schizophrenia to suggest the dominant hemisphere may fail to completely inhibit the language areas in the non-dominant half. The language allowed to ‘release’ from the right hemisphere can lead to psychotic symptoms including auditory verbal hallucinations and formal thought disorder. This book should be read by psychiatrists, neurologists and neuroscientists working in the field of psychosis and other brain scientists interested in laterality.