Control-Display Mapping in Brain-Computer Interfaces
M Thurlings, J van Erp, AM Brouwer, Benjamin Blankertz and P Werkhoven
Event-Related Potential (ERP) based Brain-Computer Interfaces (BCIs)
employ differences in brain responses to attended and ignored stimuli. When using a tactile ERP-BCI for navigation, mapping is required between
navigation directions on a visual display and unambiguously corresponding tactile stimuli (tactors) from a tactile control device: control-display mapping (CDM). We investigated the effect of congruent (both display and control horizontal or both vertical) and incongruent (vertical display, horizontal control) CDMs on task performance, the ERP and potential BCI performance.
Ten participants attended to a target (determined via CDM), in a stream of
sequentially vibrating tactors. We showed that congruent CDM yields best task performance, enhanced P300 activity and estimated BCI performance. This suggests a reduced availability of attentional resources when operating an ERP-BCI with incongruent CDM. Additionally, we found an enhanced N2 for incongruent CDM, which indicates a conflict between visual display and tactile control orientations.