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Full Access Accurate and precise parameter recovery with the basic twin model

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Accurate and precise parameter recovery with the basic twin model

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image of Multisensory Research
For more content, see Seeing and Perceiving and Spatial Vision.

The ‘time window of integration’ (TWIN) model (e.g., Colonius and Diederich, 2004; Diederich and Colonius) allows to predict response speed effects in multisensory settings. E.g., in the focused attention paradigm (FAP), subjects are instructed to respond to stimuli of the target modality only, yet reaction times are shorter if the unattended stimulus is presented in a certain temporal relation to the target stimulus. The TWIN model accounts for these cross-modal effects by proposing that all the initially unimodal bits of information must arrive at the point of integration within a certain time window in order to be integrated and thus to allow response enhancements like the observed reaction time reductions. It has been successfully used to account for empirical data. Here, we conduct a parameter recovery study of the basic TWIN model with five parameters for the duration of the visual and acoustic unimodal and the integrated second stage, the length of the time window, and the size of the effect. We conducted 576 ‘experiments’ with different parameter value sets, each comprising 500 ‘subjects’, for which data for 80 trials in a FAP setting were generated, averaged and fed into the recovery process. Parameter estimations were evaluated in terms of absolute and relative accuracy and precision. Results show that deviations from the true value are of only insignificant size for all parameters. Especially duration parameters for the unimodal stage of the focused stimulus and the integrated second stage are both highly accurate and precise, in fact to such an extent that they match statistics of single cell recordings.

Affiliations: 1: Jacobs University Bremen, SHSS Psychology, Germany

The ‘time window of integration’ (TWIN) model (e.g., Colonius and Diederich, 2004; Diederich and Colonius) allows to predict response speed effects in multisensory settings. E.g., in the focused attention paradigm (FAP), subjects are instructed to respond to stimuli of the target modality only, yet reaction times are shorter if the unattended stimulus is presented in a certain temporal relation to the target stimulus. The TWIN model accounts for these cross-modal effects by proposing that all the initially unimodal bits of information must arrive at the point of integration within a certain time window in order to be integrated and thus to allow response enhancements like the observed reaction time reductions. It has been successfully used to account for empirical data. Here, we conduct a parameter recovery study of the basic TWIN model with five parameters for the duration of the visual and acoustic unimodal and the integrated second stage, the length of the time window, and the size of the effect. We conducted 576 ‘experiments’ with different parameter value sets, each comprising 500 ‘subjects’, for which data for 80 trials in a FAP setting were generated, averaged and fed into the recovery process. Parameter estimations were evaluated in terms of absolute and relative accuracy and precision. Results show that deviations from the true value are of only insignificant size for all parameters. Especially duration parameters for the unimodal stage of the focused stimulus and the integrated second stage are both highly accurate and precise, in fact to such an extent that they match statistics of single cell recordings.

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/content/journals/10.1163/22134808-000s0113
2013-05-16
2016-12-07

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