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A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions

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Published on: July 16, 2015

Automatic and controlled stimulus processing in conflict tasks: Superimposed diffusion processes and delta functions.

Rolf Ulrich¹, Hannes Schröter¹, Hartmut Leuthold¹

¹University of Tübingen, Germany.

Cognitive Psychology

|April 25, 2015

Summary

This summary is machine-generated.

A new Diffusion Model for Conflict Tasks (DMC) explains reaction times in cognitive tasks by combining controlled and automatic processes. This model successfully accounts for complex reaction time patterns, including challenging negative-going delta functions.

Keywords:

Automatic and controlled processes Conflict tasks Delta functions Delta plots Wiener diffusion process

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Area of Science:

Cognitive psychology
Computational neuroscience
Psychological modeling

Background:

Standard diffusion models struggle to explain all observed reaction time distributions in conflict tasks.
Negative-going delta functions present a particular challenge for existing diffusion models.

Purpose of the Study:

To introduce an elaborated diffusion model (DMC) that integrates controlled and automatic processes.
To demonstrate DMC's ability to account for diverse reaction time distributional properties in conflict tasks.
To reconcile standard diffusion models with empirical findings like negative-going delta functions.

Main Methods:

Development of the Diffusion Model for Conflict Tasks (DMC).
Monte Carlo simulations to analyze the role of automatic activation unfolding.
Fitting DMC to experimental data from Eriksen flanker and Simon tasks.

Main Results:

DMC successfully models various delta function shapes, including negative-going ones.
The temporal unfolding of automatic activation is shown to determine delta function shapes.
DMC predictions align with observed error rate patterns in conflict tasks.

Conclusions:

The Diffusion Model for Conflict Tasks (DMC) provides a unified framework for understanding reaction times in cognitive conflict.
DMC successfully integrates controlled and automatic processing, addressing limitations of standard diffusion models.
The model's empirical validation on Eriksen flanker and Simon tasks supports its explanatory power.