Accurate and precise parameter recovery of the TWIN model for multi-sensory reaction time effects F Kandil1, H Colonius2, A Diederich1 |
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1School of Humanities and Social Sciences, Jacobs University Bremen, Germany |
| In multisensory settings such as the focused attention paradigm (FAP), subjects are instructed to respond to stimuli of the target modality only, yet reaction times are shorter if an unattended stimulus is presented with a certain temporal offset. The "time window of integration" (TWIN) model has been successful in predicting these observed cross-modal reaction time effects. It proposes that all the initially unimodal information must arrive at the point of integration within a certain time window in order to be integrated and initiate the observed reaction time reductions. Here, we conducted 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. Parameter estimations were evaluated in terms of 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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