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. 2018 Dec;15(12):1154-1161.
doi: 10.30773/pi.2018.10.10.2. Epub 2018 Nov 26.

Relationship of Working Memory, Processing Speed, and Fluid Reasoning in Psychiatric Patients

Se-Jin Kim  1 , Eun Hee Park  1   2
Affiliations

Relationship of Working Memory, Processing Speed, and Fluid Reasoning in Psychiatric Patients

Se-Jin Kim et al. Psychiatry Investig. 2018 Dec.

Abstract

Objective: The present study aimed to investigate relationship among cognitive factors (working memory and processing speed) and fluid reasoning (Gf) in psychiatric patients using a standardized clinical tool.

Methods: We included the responses of 115 heterogeneous patients who were diagnosed with the MINI-Plus 5.0 and WAIS-IV/WMSIV was administered. For our analysis, structured equation modeling (SEM) was conducted to evaluate which cognitive variables are closely related to the Gf.

Results: The results showed that the visual working memory was the strongest predictor of the Gf compared to other cognitive factors.

Conclusion: Processing speed was capable of predicting the Gf, when visual working memory was controlled. The inter-relationship among the Gf and other cognitive factors and its clinical implications were further discussed.

Keywords: Fluid reasoning; Processing speed; WAIS-IV; WMS-IV; Working memory.

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Figures

Figure 1.
Figure 1.
Measurement model. The circles represent latent constructs, and the squares represent the observed variables. Single-headed arrows represent standardized factor loadings and double-headed arrows represent correlations between factors. All parameter estimates are standardized and significant at p<0.05. DS: Digit Span, LN: Letter Number Sequencing, SA: Spatial Addition, SSP: Symbol Span, SS: Symbol Search, CD: Coding, MR: Matrix Reasoning, FW: Figure Weight.
Figure 2.
Figure 2.
Unconstrained model. The circles represent latent constructs, and the squares represent the observed variables. Single-headed arrows represent standardized factor loadings and double-headed arrows represent correlations between factors. All parameter estimates are standardized and significant at **p<0.01. DS: Digit Span, LN: Letter Number Sequencing, SA: Spatial Addition, SSP: Symbol Span, SS: Symbol Search, CD: Coding, MR: Matrix Reasoning, FW: Figure Weight.
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