Diffusion Versus Linear Ballistic Accumulation: Different Models but the Same Conclusions About Psychological Processes?

Overview

Journal Psychon Bull Rev

Specialty Psychology

Date 2011 Feb 18

PMID 21327360

Citations 74

Authors

Chris Donkin

Scott Brown

Andrew Heathcote

Eric-Jan Wagenmakers

Affiliations

Soon will be listed here.

Abstract

Quantitative models for response time and accuracy are increasingly used as tools to draw conclusions about psychological processes. Here we investigate the extent to which these substantive conclusions depend on whether researchers use the Ratcliff diffusion model or the Linear Ballistic Accumulator model. Simulations show that the models agree on the effects of changes in the rate of information accumulation and changes in non-decision time, but that they disagree on the effects of changes in response caution. In fits to empirical data, however, the models tend to agree closely on the effects of an experimental manipulation of response caution. We discuss the implications of these conflicting results, concluding that real manipulations of caution map closely, but not perfectly to response caution in either model. Importantly, we conclude that inferences about psychological processes made from real data are unlikely to depend on the model that is used.

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