Introducing the Edges Paradigm: A P300 Brain-Computer Interface for spelling written words.

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Obeidat , Q , Campbell , T A & Kong , J 2015 , ' Introducing the Edges Paradigm: A P300 Brain-Computer Interface for spelling written words. ' , IEEE Transactions on Human-Machine Systems , vol. 45 , no. 6 , pp. 727-738 . https://doi.org/10.1109/THMS.2015.2456017

Title: Introducing the Edges Paradigm: A P300 Brain-Computer Interface for spelling written words.
Author: Obeidat, Qasem; Campbell, Thomas Anthony; Kong, Jun
Contributor: University of Helsinki, Neuroscience Center
Date: 2015
Language: eng
Number of pages: 12
Belongs to series: IEEE Transactions on Human-Machine Systems
ISSN: 2168-2291
URI: http://hdl.handle.net/10138/173803
Abstract: P300-based brain–computer interface spellers employ the P300 component, which is derived from scalp measured electroencephalogram during the brain’s electrical response to a flash denoting an attended target character. The most popular P300 speller, the row–column paradigm (RCP), displays characters in a matrix within which rows and columns of characters are flashed eliciting P300 responses when the illuminated row or column contains the attended target character. Despite being a longstanding successful approach, this RCP faces several challenges, including the adjacency and crowding problems. A new P300 speller is introduced—the edges paradigm (EP). Distinct from existing P300 spellers, the EP presents a square adjacent to each column or row in the outer boundary of the matrix. By replacing each flash of a row or column with that square, this EP exhibited attenuated influences of crowding and adjacency—problems known to perturb the RCP. In the copy-spelling mode, 14 neurologically normal participants demonstrated an improved accuracy of 93.3 +\- 2.0% for the EP relative to 81.7 +\- 2.8% for the RCP, alongside a faster communication rate. Subjective ratings also indicated that the EP caused significantly less fatigue, while increasing alertness and comfort.
Subject: 3112 Neurosciences
113 Computer and information sciences
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