Proverb comprehension in schizophrenia: A comprehensive review and meta-analysis.2

Area of Science:

• Cognitive Psychology
• Clinical Psychology
• Psychiatry

Background:

• Proverb comprehension deficits are common in individuals with schizophrenia (iSCZ) and traditionally assessed via abstraction and concreteness.
• Previous research has questioned the specificity of proverb tests, but a meta-analysis has been lacking.
• This meta-analysis aims to synthesize experimental research on proverb comprehension in iSCZ compared to controls.

Approach:

• A systematic search of PubMed, Web of Science, and PsycInfo databases was conducted.
• 27 eligible studies, published between 1956 and 2020, were included in multi-level meta-analyses.
• Moderator analyses examined factors like response format, control group type, and participant demographics.

Key Points:

• Individuals with schizophrenia (iSCZ) exhibited significantly less abstract (g = -1.00), more concrete (g = 0.69), and more bizarre (g = 1.08) proverb responses compared to controls.
• The type of control group (healthy vs. clinical) moderated these differences, with larger discrepancies observed against healthy controls.
• IQ/education and age emerged as potential sources of variability in abstraction and bizarreness.

Conclusions:

• Lower abstraction and higher bizarreness appear characteristic of iSCZ, but the diagnostic specificity of concrete responses is low.
• Lack of unified definitions and consideration of cultural diversity complicate findings.
• Future research should explore qualitative aspects and symptom associations to enhance diagnostic accuracy.