Psychopathology and Theory of Perceptual Disturbances

Current classification systems for psychiatric disorders are primarly based on categorial typologies and describe these as distinct nosological entities. A dimensional perspective allows descriptions of a gradual transition between pathologies as well as between normality and pathologies of psychiatric symptoms. Using acoustic hallucinations as most common form of perception disturbances as example, psychiatric-psychopathological and theoretical pros and cons for a dimensional classification of psychiatric symptomatology are sketched in this article. Although doubts concerning the similarity of real perceptions and acoustic hallucinations which underlie such mental events are controversially discussed, many hints could be found for a continuum of hallucinatoric symptoms from the mentally healthy population up to the group of patients with schizophrenia. Studies which investigate the neurophysiological mechanisms of acoustic hallucinations such as hearing voices in healthy persons in comparison to those in patients with schizophrenia could contribute to further differentiation.