Modality switching (and the absence thereof) modulates the redundant signal effect.

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Responses to bimodal signals are faster than those to their unimodal constituents. This so-called redundant signal effect (RSE) is affected by sequential effects such as modality switching, where changing modality in a random trial sequence causes a slowing of responses. Critically, while unimodal trials can follow full modality switches (e.g., auditory following visual), bimodal trials can follow only partial switches (e.g., audiovisual following visual). Thus, the effect of full modality switches on bimodal responses is unknown. Here, in addition to the standard instruction to detect auditory/visual signals, we presented tactile target signals in the random trial sequence. Consequently, bi- and unimodal trials can follow full modality switches (e.g., an audiovisual following tactile signal). Our data show that modality switching modulates the RSE. Interestingly, unlike their unimodal counterparts, bimodal responses are not (or only marginally) affected by full modality switches. Thus, the observed modulation of the RSE is largely driven by unimodal responses that are slowed due to modality switching. Therefore, understanding modality switching and its differential effect on uni- and bimodal responses will be key to fully understanding the processes underlying the RSE.
Period4 Jul 2024
Event title52nd Experimental Psychology Society Meeting
Event typeConference
LocationYork, United KingdomShow on map