ISSN 2043-8087
Journal of Experimental Psychopathology
 Volume 5, Issue 4, 492-502, 2014
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Neurocognitive underpinnings of language disorder: Contrasting schizophrenia and mood disorders

Authors
  Alex Cohen - Louisiana State University, Department of Psychology
  Tracey Auster - Louisiana State University, Department of Psychology
  Dallas Callaway - Louisiana State University, Department of Psychology
  Rebecca MacAulay - Louisiana State University, Department of Psychology
  Kyle Minor - Harvard Medical School at Beth Israel Deaconess Medical Center, Department of Psychiatry

Volume 5, Issue 4, 2014, Pages 492-502
DOI: http://dx.doi.org/10.5127/jep.034213

Abstract
Language disorder is a deleterious, but poorly understood, symptom of schizophrenia. Burgeoning research suggests that it also occurs in depression and bipolar disorders. Building on prior research, the present study evaluated the degree to which language disorder was associated with neurocognitive deficits in a sample of patients with schizophrenia and mood disorders. Employed in this study were a standard neurocognitive battery and a behavior-based analysis of language disorder from natural speech. Speech samples were collected from two separate counterbalanced conditions administered a week apart. During an “activity” speech condition, participants discussed their daily activities, hobbies and interests. During a “social” speech condition, participants discussed social relationships from their lives. The schizophrenia and mood disorder groups were similar in severity of language disorder during the activity condition. However, there was a significant difference in the severity of language disorder within the schizophrenia patient group but not the mood disorder group. For patients with schizophrenia, language disorder was associated with a range of neurocognitive deficits for both the activity and social speech conditions. For patients with mood disorders, language disorder was significantly associated with poorer neurocognitive functioning during the activity condition, conversely it was significantly associated with better neurocognitive functioning during the social condition. These findings highlight the importance of neurocognition for understanding language disorder across a wide swath of severe mental illnesses. They also emphasize how mitigating factors that exacerbate language disorder may differ in patients with schizophrenia versus mood disorders. Directions for future research are discussed.

Table of Contents
Introduction
Method
 Participants
Procedure
 Diagnostic and Symptom Ratings
 Language Disorder Measure
 Neurocognitive Functioning
 Analyses
Results
 Descriptive Statistics
 Group Comparisons in Language Disorder
 Correlations between Neurocognition and Language Disorder
 Correlations between Neurocognition and Affective Reactivity
Discussion
References

Correspondence to
Alex S. Cohen, Ph.D., Louisiana State University, Department of Psychology, 236 Audubon Hall, Baton Rouge, LA70803, U.S.A.

Keywords
schizophrenia, depression, thought disorder, language, disorganization, cognition

Dates
Received 8 Jan 2014; Revised 20 Jan 2014; Accepted 7 Apr 2014; In Press 14 Dec 2014







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