Measuring needs with the thematic apperception test: a psychometric study.

Area of Science:

• Psychological assessment
• Personality psychology
• Psychometrics

Background:

• Thematic Apperception Test (TAT) is a projective measure of human motivation.
• Existing theories of apperception lack comprehensive explanatory power for TAT responses.
• Item response theory (IRT) offers a framework for modeling psychological tests.

Purpose of the Study:

• To propose and evaluate three distinct apperception theories.
• To translate these theories into formal item response theory (IRT) models.
• To determine the best-fitting model for explaining responses to TAT cards, specifically for need for achievement (nAch).

Main Methods:

• Development of three theoretical models of apperception.
• Formulation of corresponding IRT models for each theory.
• Application of the IRT models to need for achievement (nAch) data.
• Cross-validation of the best model using data for need for power and need for affiliation.

Main Results:

• The apperception theory with two response types, termed the drop-out apperception theory, provided the best model fit.
• The first response type is diagnostic of an individual's nAch level, influenced by personal nAch and card characteristics.
• The second response type is not diagnostic of nAch, as it is independent of these factors.

Conclusions:

• The drop-out apperception theory offers a superior framework for understanding TAT responses.
• This model distinguishes between diagnostic and non-diagnostic responses related to specific needs.
• The findings have implications for the psychometric properties and interpretation of the TAT.