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Heymans Colloquium: dr A. Heathcote, A Two-Phase Theory of  Choice Conflict Tasks

When:Th 15-08-2013 16:00 - 17:00

Dr. Andrew Heathcote
(School of Psychology, The University of Newcastle, Australia)

A Two-Phase Theory of  Choice Conflict Tasks

Thursday, 15 August 2013, 16.00 - 17.00 hrs

Room M.0074, Munting Building, Grote Kruisstraat 2/1, Groningen


We propose a theory of how decision processes are affected by response conflict. The theory is developed to
account for the fine-grained time course of both response speed and accuracy as quantified by delta functions
and conditional accuracy functions. The theory, Two-Phase Evidence Accumulation (TPEA), extends Brown and
Heathcote’s (2008) Linear Ballistic Accumulator (LBA) model to provide a unified account of three tasks that
have been central to the study of cognitive interference the Stroop, Simon and Flanker tasks. The theory is
explicated by demonstrating that it provides a coherent parametric account of Stroop and Simon effect delta
functions shown by Pratte, Rouder, Morey and Feng (2010) to be incompatible with existing theories. We then
show that, without modification, TPEA is also able to account for White, Ratcliff and Starns’ (2011) flanker data.

For more information you may contact
dr. R.D. (Richard) Morey,
email  address: