P300 amplitudes in the frontal cluster were decreased, though nonsignificantly.
#PROLOQUO SCENE DISPLAY OFFLINE#
Offline BCI-AAC accuracy for each condition was evaluated using cross-validation.ĭisplay asymmetry significantly decreased P300 latency in the centro-parietal cluster. Following each condition, participants completed task-evaluation ratings (e.g., engagement).
#PROLOQUO SCENE DISPLAY FULL#
Participants completed three experimental conditions to evaluate the effects of item arrangement asymmetry and context on P300-based BCI-AAC signals and offline BCI-AAC accuracy, including 1) the full contextual scene condition, 2) asymmetrical item arraignment without context condition and 3) the grid condition. Therefore, the aim of this multidisciplinary investigation is to provide an initial exploration of contextual scene use for BCI-AAC. Understanding the neurological processes from which BCI-AAC devices function is crucial to human-centered computing for BCI-AAC. However, contextual scene displays contrast starkly with the standard P300-grid approach. Contextual scene displays are composed of context-rich images (e.g., photographs) and may support AAC success. Traditionally, visually based P300-BCI-AAC displays utilize a symmetrical grid layout. We consider three specific ways in which bodies of knowledge drawn from the visual cognitive sciences may be relevant to the composition of VSDs, with the understanding the direct research with children with complex communication needs is necessary to verify or refute our speculations.īrain-computer interfaces for augmentative and alternative communication (BCI-AAC) may help overcome physical barriers to AAC access. In this Forum Note, we discuss characteristics of one particular type of aided AAC display, that is, Visual Scene Displays (VSDs) as they may relate to user visual and cognitive processing.
Understanding of visual-cognitive processing - that is, how a user attends, perceives, and makes sense of the visual information on the display - therefore seems critical to designing effective aided AAC interventions. When the medium for communication is visual, it seems likely that the effectiveness of intervention depends in part on the effectiveness and efficiency with which the information presented in the display can be perceived, identified, and extracted by communicators and their partners. Most aided AAC systems rely on a visual modality. Aided augmentative and alternative (AAC) interventions have been demonstrated to facilitate a variety of communication outcomes in persons with intellectual disabilities.
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