Is the Halstead Category Test a multidimensional instrument?

Area of Science:

• Neuropsychology
• Cognitive Psychology
• Psychometrics

Background:

• The Halstead Category Test (HCT) is a widely used neuropsychological assessment.
• Understanding the underlying factor structure of the HCT is crucial for accurate interpretation of cognitive deficits.
• Previous research has not definitively established the factor structure across diverse clinical populations.

Purpose of the Study:

• To evaluate the factor structure of the Halstead Category Test.
• To examine the HCT's factor structure in patients with schizophrenia, brain damage, and healthy controls.
• To investigate the relationship between HCT factors and other cognitive measures.

Main Methods:

• Confirmatory factor analysis was employed to analyze the HCT's factor structure.
• Analyses were conducted both including and excluding subtests 1 and 2.
• The study included patients diagnosed with schizophrenia, heterogeneous forms of brain damage, and patient controls.

Main Results:

• A three-factor model (Counting, Spatial Positional Reasoning, Proportional Reasoning) was optimal when all subtests were included.
• Excluding subtests 1 and 2, a two-factor solution (Spatial Positional and Proportional Reasoning) emerged, with subtest 7 loading on both.
• Optimal factor structures were consistent across all patient groups, and factor scores correlated significantly with other cognitive measures.

Conclusions:

• The Halstead Category Test is a multidimensional assessment tool.
• The identified factors demonstrate general associations with broader cognitive abilities.
• The consistent factor structure across diverse clinical groups supports its utility in neuropsychological evaluations.