Use of MMPI-2 to predict cognitive effort: a hierarchically optimal classification tree analysis

Area of Science:

• Neuropsychology
• Forensic Psychology
• Psychometrics

Background:

• Neuropsychologists utilize response validity measures to assess the authenticity of test performances.
• The interplay between cognitive and psychological measures of response validity is not well-established.
• Predictive value of psychological tests for response validity in clinical and forensic settings requires further investigation.

Purpose of the Study:

• To investigate the relationship between psychological test results (MMPI-2) and cognitive effort measures.
• To determine if MMPI-2 scales can predict sufficient effort (SE) or insufficient effort (IE) in clinical and civil forensic samples.

Main Methods:

• Utilized classification tree methodology (Optimal Data Analysis: ODA) on a sample of 307 individuals.
• Participants completed the MMPI-2 and various cognitive effort measures.
• Data included individuals in secondary gain contexts (n=198) and those without (n=109).

Main Results:

• Optimal Data Analysis identified decision trees to classify sufficient effort (SE) versus insufficient effort (IE) based on MMPI-2 scales.
• The Response Bias Scale (RBS) emerged as a primary predictor of cognitive effort.
• Following the exclusion of RBS, the Hy scale became significant in classifying insufficient effort (IE).

Conclusions:

• Specific MMPI-2 scores are associated with sufficient and insufficient effort in civil litigants and claimants.
• Findings highlight the complex association between MMPI-2 scores and effort test results within the litigation context.
• The study provides valuable insights for neuropsychologists evaluating response validity in forensic evaluations.