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Related Experiment Video

Updated: Jul 7, 2026

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

No evidence for rule-based processing in the inverse base-rate effect.

Koen Lamberts¹, Christopher Kent

¹Department of Psychology, University of Warwick, Coventry, England. k.lamberts@warwick.ac.uk

Memory & Cognition

|February 13, 2008

Summary

This summary is machine-generated.

The inverse base-rate effect in categorization persists even under time pressure or task load. This suggests attention-shifting, not rule-based processes, explains this counterintuitive decision-making phenomenon.

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Area of Science:

Cognitive Psychology
Decision Making
Human Behavior

Background:

The inverse base-rate effect describes how people favor less frequent categories for ambiguous stimuli, contradicting Bayesian principles.
Existing explanations include rule-based processing and attention-shifting mechanisms.

Purpose of the Study:

To investigate the underlying mechanisms of the inverse base-rate effect in categorization.
To differentiate between rule-based and attention-shifting accounts.

Main Methods:

Participants performed a categorization task known to elicit the inverse base-rate effect.
The task was administered under standard conditions, time pressure, and with a secondary task load.

Main Results:

The inverse base-rate effect remained robust under both time pressure and secondary task load.
No evidence supported a role for rule-based processes in generating the effect.

Conclusions:

The findings challenge rule-based explanations for the inverse base-rate effect.
Data align with an attention-shifting account, suggesting attentional dynamics influence categorization decisions under cognitive load.