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Separating stimulus-driven and response-related LRP components with Residue Iteration Decomposition (RIDE)

Authors

  • Birgit Stürmer,

    Corresponding author
    • Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany
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  • Guang Ouyang,

    1. Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong
    2. Centre for Nonlinear Studies and The Beijing–Hong Kong–Singapore Joint Centre for Nonlinear and Complex Systems, Hong Kong Baptist University, Kowloon Tong, Hong Kong
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  • Changsong Zhou,

    1. Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong
    2. Centre for Nonlinear Studies and The Beijing–Hong Kong–Singapore Joint Centre for Nonlinear and Complex Systems, Hong Kong Baptist University, Kowloon Tong, Hong Kong
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  • Annika Boldt,

    1. Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany
    2. Department of Experimental Psychology, University of Oxford, Oxford, United Kingdom
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  • Werner Sommer

    1. Department of Psychology, Humboldt-Universität zu Berlin, Berlin, Germany
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  • This research was supported by the High Performance Cluster Computing Centre, Hong Kong Baptist University, and by grants of the Hong Kong Baptist University, the Hong Kong Research Grants Council (HKBU 202710) to G.O. and C.Z., the German Academic Exchange Service (DAAD) to G.O., and the German Research Foundation (STU248/3-1) to B.S.

Address correspondence to: Prof. Dr. Birgit Stürmer, Humboldt-Universität zu Berlin, Institute for Psychology, Rudower Chaussee 18, 12489 Berlin. E-mail: birgit.stuermer@cms.hu-berlin.de

Abstract

When the lateralized readiness potential (LRP) is recorded in stimulus–response compatibility (SRC) tasks, two processes may overlap in the LRP, stimulus-driven response priming and activation based on response selection rules. These overlapping processes are hard to disentangle with standard analytical tools. Here, we show that Residue Iteration Decomposition (RIDE), based on latency variability, separates the overlapping LRP components from a Simon task into stimulus-driven and response-related components. SRC affected LRP amplitudes only in the stimulus-driven component, whereas LRP onsets were affected only in the response-locked component. Importantly, the compatibility effect in reaction times was more similar to the effect in the onsets of the RIDE-derived response-locked LRP component than in the unseparated LRP. Thus, RIDE-separated LRP components are devoid of distortions inherent to standard LRPs.

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