A dynamic model of deciding not to choose

Area of Science:

• Cognitive psychology
• Decision-making theory
• Psychophysics

Background:

Purpose of the Study:

• Develop a quantitative theory for "do not know" judgments.
• Account for response times and frequencies of definitive vs. "do not know" responses.
• Investigate factors influencing "do not know" decisions, such as stimulus similarity and response incentives.

Main Methods:

• Proposed the multiple threshold race (MTR) model.
• Conducted recognition memory experiments with varying face similarity (morphing).
• Manipulated error penalties and response criteria (speed vs. accuracy).

Main Results:

• The MTR model successfully predicted response patterns across experiments.
• Increased stimulus similarity led to more "do not know" responses.
• Individual differences in "do not know" usage were observed and modeled.

Conclusions:

• The MTR model provides a robust framework for understanding "do not know" decisions.
• Parameter estimates offer insights into the psychological mechanisms underlying response selection.
• The theory has implications for educational testing and eyewitness testimony research.