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Hypothesis generation, probability judgment, and individual differences in working memory capacity.

Michael R P Dougherty¹, Jennifer E Hunter

¹Department of Psychology, University of Maryland, College Park, MD 20742, USA. mdougherty@psyc.umd.edu

Acta Psychologica

|July 2, 2003

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Working memory (WM) influences how people judge probabilities and generate hypotheses. Higher WM capacity is linked to more accurate probability estimates, suggesting it

Area of Science:

Cognitive Psychology
Decision Science
Human Judgment and Decision Making

Background:

Probability judgment and hypothesis generation are complex cognitive processes.
Working memory (WM) is crucial for cognitive tasks requiring information manipulation.
Understanding the role of WM in these judgments is key to cognitive modeling.

Purpose of the Study:

To investigate the influence of working memory capacity on probability judgment.
To examine the relationship between working memory and hypothesis generation.
To explore how memory retrieval affects probability estimations.

Main Methods:

A simulated dinner menu task was used to assess probability judgments.
Participants estimated the likelihood of specific menu items being ordered.

Related Experiment Videos

Working memory capacity was measured using the operation-span task.

Main Results:

Probability judgments were relative to alternatives retrieved from long-term memory.
WM capacity positively correlated with the number of retrieved alternatives.
Judgments were subadditive, and this subadditivity was influenced by memory retrieval and negatively correlated with WM capacity.

Conclusions:

Individual differences in working memory capacity significantly impact probability judgment.
WM capacity plays a fundamental role in hypothesis generation processes.
The findings highlight the interplay between memory retrieval and judgment accuracy.