AUDITORY HALLUCINATIONS AND INTELLECTUAL DEFICIT

Verbal hallucinations and language production processes in schizophrenia

How is it that many schizophrenics identify certain instances of verbal imagery as hallucinatory? Most investigators have assumed that alterations in sensory features of imagery explain this. This approach, however, has not yielded a definitive picture of the nature of verbal hallucinations. An alternative perspective suggests itself if one allows the possibility that the nonself quality of hallucinations is inferred on the basis of the experience of unintendedness that accompanies imagery production. Information-processing models of “intentional” cognitive processes call for abstract planning representations that are linked to goals and beliefs. Unintended actions - and imagery - can reflect planning disruptions whereby cognitive products do not cohere with concurrent goals. A model of schizophrenic speech disorganization is presented that postulates a disturbance of discourse planning. Insofar as verbal imagery can be viewed as inwardly directed speech, a consequence of such planning disturbances could be the production of unintended imagery. This link between the outward disorganization of schizophrenic speech and unintended verbal imagery is statistically supported by comparing the speech behavior of hallucinating and nonhallucinating schizophrenics. Studies of “borderline” hallucinations during normal, “goal-less” relaxation and drowsiness suggest that experiential unintendedness leads to a nonpathological variant of hallucinatory otherness that is correctable upon emerging from such passive cognitive states. This contrasts with the schizophrenic case, where nonconcordance with cognitive goals reinforces the unintendedness of verbal images and sustains the conviction of an external source. This model compares favorably with earlier models of verbal hallucinations and provides further evidence for a language production disorder in many schizophrenics.Short Abstract: How is it that many schizophrenics identify certain instances of verbal imagery as hallucinatory? This paper proposes that the critical feature identifying hallucinations is the experience of unintendedness. This experience is nonpathological during passive conscious states but pathological if occurring during goal-directed cognitive processing. A model of schizophrenic speech disorganization is presented that postulates a disturbance of discourse planning that specifies communicative intentions. These alterations could generate unintended verbal imagery as well. Statistical data are offered to support the model, and relevant empirical studies are reviewed.

Hallucinations in children with conduct and emotional disorders: II. The follow-up study

In a controlled study, 20 children with hallucinations and emotional or conduct disorders were followed up into adulthood. The mean follow-up time was 17 years and the mean age at follow-up was 30 years. Hallucinations in childhood did not carry an increased risk for psychoses, depressive illness, organic brain damage or other psychiatric disorders. The continuation of hallucinations and episodes of altered awareness in some of the subjects may indicate a special predisposition to hallucinate.

Psychotic children with hallucinations

In a retrospective study, 20 psychotic children and adolescents with hallucinations were compared with 15 psychotic controls without hallucinations. In the former, auditory hallucinations predominated, which tended to be localised in the internal space of the child. Subjects with hallucinations had significantly more symptoms of depression and anxiety, more precipitants of illness and problems in reading ability. There was a trend for increased laconic speech in them. The findings suggest a link between hallucinations and mood and cognitive changes in children and adolescents with psychoses of late onset.

Hallucinations in Psychiatrically Disordered Children: Preliminary Communication

In a retrospective study children with hallucinations and nonorganic psychiatric conditions were compared with matched controls. Hallucinations were found to be a rare symptom except in children with a diagnosis of psychosis of late onset where they were commonly present. Children with hallucinations were older than the majority of subjects seen in the Child Psychiatric Clinic. The perceptual symptoms were associated with precipitants of illness and mood changes. In the nonpsychotic subjects, they were also associated with symptoms suggestive of minor brain dysfunction. The results are discussed and ideas for future research suggested.

Auditory hallucinations and the Verbal Transformation Effect

In an attempt to replicate findings reported by Slade (1976), 12 hallucinating and 12 non-hallucinating shcizophrenic subjects were compared on tests of verbal ability, personality and mental imagery variables and the Verbal Transformation Effect. No significant differences between the groups was demonstrated. When the data from both groups of schizophrenics were combined, a significant correlation was found between 2 measures of the Verbal Transformation Effect and the P-score of the Eysenck Personality Questionnaire.

An investigation of psychological factors involved in the predisposition to auditory hallucinations

Previous research by the author (Slade, 1972, 1973) and others has suggested that psychological stress plays an important role in triggering off the experience of auditory hallucinations. Clearly, however, predispositional factors are involved as well. The present study is an attempt to investigate some of the psychological factors which may predispose the individual to such experiences. A battery of tests involving cognitive, personality and mental imagery variables and the verbal transformation effect was administered to two small groups of psychotic patients differing only in respect of a history of auditory hallucinations and a normal control group. The main conclusion was that the results lend direct support to the proposition of Mintz & Alpert (1972) that a combination of vivid mental imagery and poor reality-testing in the auditory modality provides the basic predisposition for the experience of auditory hallucinations.