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Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder

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A meta-analysis of depression severity and cognitive function.

Lisa M McDermott¹, Klaus P Ebmeier

¹Department of Psychiatry, University of Oxford, UK.

Journal of Affective Disorders

|May 12, 2009

Summary

Depression severity is linked to cognitive impairment in memory, executive function, and processing speed. This meta-analysis clarifies inconsistent findings, suggesting underpowered studies contributed to previous discrepancies in depression and cognition research.

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Published on: February 22, 2018

Area of Science:

Neuroscience
Psychiatry
Cognitive Psychology

Background:

Previous research on the association between cognitive impairment and depression has yielded inconsistent results.
Discrepancies in findings may stem from variations in depression severity across studies.
Inconsistent results are also noted regarding the specific link between depression severity and cognitive performance.

Purpose of the Study:

To conduct a meta-analysis examining the relationship between depression severity and cognitive function.
To clarify inconsistent findings in the literature regarding depression and cognitive performance.

Main Methods:

A meta-analysis was performed using Pearson's correlation coefficient (r) between depression severity scores and neuropsychological test performance.
Individual meta-analyses were conducted for specific cognitive domains: episodic memory, executive function, processing speed, semantic memory, and visuo-spatial memory.
Analyses also differentiated between timed and un-timed cognitive tests across functional domains.

Main Results:

Significant correlations between depression severity and cognitive performance were observed in episodic memory, executive function, and processing speed.
No significant correlations were found for semantic memory or visuo-spatial memory.
Correlations with depression severity were equally significant for both timed and un-timed cognitive measures.

Conclusions:

Inconsistent findings in previous research may be attributed to random variations and insufficient statistical power in individual studies.
Limitations include a small number of studies meeting inclusion criteria for certain cognitive domains and a cross-sectional design.
Further research with robust methodology is needed to fully elucidate the complex relationship between depression severity and cognitive function.