Se han identificado déficits de percepción auditiva en la esquizofrenia (SZ) y se vinculan a la disfunción en la corteza auditiva. Dado que los síntomas psicóticos, incluyen alucinaciones auditivas, también se han observado en el trastorno bipolar (BD), puede ser que los individuos con BD que también exhiben síntomas psicóticos demuestren una deficiencia similar en la percepción auditiva.Cincuenta individuos con SZ, 30 individuos con trastorno bipolar I con antecedentes de psicosis (BD+), 28 individuos con trastorno bipolar I, sin antecedentes de síntomas psicóticos (BD-), y 29 controles normales (NC) se les administró una tarea de discriminación de tono y una tarea de reconocimiento de las emociones.
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Objectives. Auditory perception deficits have been identified in schizophrenia (SZ) and linked to dysfunction in the auditory cortex. Given that psychotic symptoms, including auditory hallucinations, are also seen in bipolar disorder (BD), it may be that individuals with BD who also exhibit psychotic symptoms demonstrate a similar impairment in auditory perception.
Methods. Fifty individuals with SZ, 30 individuals with bipolar I disorder with a history of psychosis (BD+), 28 individuals with bipolar I disorder with no history of psychotic features (BD?), and 29 normal controls (NC) were administered a tone discrimination task and an emotion recognition task.
Results. Mixed-model analyses of covariance with planned comparisons indicated that individuals with BD+ performed at a level that was intermediate between those with BD? and those with SZ on the more difficult condition of the tone discrimination task and on the auditory condition of the emotion recognition task. There were no differences between the BD+ and BD? groups on the visual or auditoryvisual affect recognition conditions. Regression analyses indicated that performance on the tone discrimination task predicted performance on all conditions of the emotion recognition task. Auditory hallucinations in BD+ were not related to performance on either task.
Conclusions. Our findings suggested that, although deficits in frequency discrimination and emotion recognition are more severe in SZ, these impairments extend to BD+. Although our results did not support the idea that auditory hallucinations may be related to these deficits, they indicated that basic auditory deficits may be a marker for psychosis, regardless of SZ or BD diagnosis.