![]() Speech variability measures generally did not differ between groups. However, every speech production and content measure was significantly abnormal in SMI versus control groups. ![]() Generally speaking, speech deficits did not differ as a function of SMI diagnosis. For correlational analysis, cognitive ability was measured using a standardized battery. Subjects produced natural speech during a baseline condition and while engaging in an experimentally-manipulated cognitively-effortful task. We examined natural speech from 52 patients meeting criteria for serious mental illnesses (i.e., severe functional deficits with a concomitant diagnosis of schizophrenia, unipolar and/or bipolar affective disorders) and 30 non-psychiatric controls using a range of objective, computer-based measures tapping speech production (“alogia”), variability (“blunted vocal affect”) and content (“poverty of content of speech”). The present project evaluated the degree to which these deficits manifest as a function of cognitive resource limitations. ![]() Speech deficits, notably those involved in psychomotor retardation, blunted affect, alogia and poverty of content of speech, are pronounced in a wide range of serious mental illnesses (e.g., schizophrenia, unipolar depression, bipolar disorders). ![]()
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