TY - JOUR
T1 - Task and stimulation paradigm effects in a P300 brain computer interface exploitable in a Virtual Environment
T2 - A pilot study
AU - Piccione, Francesco
AU - Priftis, Konstantinos
AU - Tonin, Paolo
AU - Vidale, Denis
AU - Furlan, Roberto
AU - Cavinato, Marianna
AU - Merico, Antonio
AU - Piron, Lamberto
PY - 2008
Y1 - 2008
N2 - The aim of the present study is to compare different visual elicitation paradigms exploitable in a Virtual Environment in order to establish whether the BCI is affected by the structure of the elicitation paradigm, the modalities of stimulus presentation, and the complexity of stimulus recognition and semantic processing. We have developed a device which can control the motion of a cursor on a computer graphical interface, using ERPs (Piccione et al., 2006). Subsequently, we tested different visual elicitation paradigms which evoked P300 waves to control the movement of an object in a virtual environment. Visual stimuli, consisting of four arrows (forward, right, back, left), were randomly presented in peripheral positions of a virtual environment. Users were instructed to recognize only the stimulus related to the preferred object movement direction (target). The sum of the absolute differences between target and non-target traces (ra index) was compared in the different elicitation paradigms. Results showed a significant reduction of ra index with the use of more semantically complex paradigms. Therefore, the P300 BCI system seems to be affected by the structure of the elicitation paradigm, the modalities of stimulus presentation, and the complexity of stimulus recognition and semantic processing.
AB - The aim of the present study is to compare different visual elicitation paradigms exploitable in a Virtual Environment in order to establish whether the BCI is affected by the structure of the elicitation paradigm, the modalities of stimulus presentation, and the complexity of stimulus recognition and semantic processing. We have developed a device which can control the motion of a cursor on a computer graphical interface, using ERPs (Piccione et al., 2006). Subsequently, we tested different visual elicitation paradigms which evoked P300 waves to control the movement of an object in a virtual environment. Visual stimuli, consisting of four arrows (forward, right, back, left), were randomly presented in peripheral positions of a virtual environment. Users were instructed to recognize only the stimulus related to the preferred object movement direction (target). The sum of the absolute differences between target and non-target traces (ra index) was compared in the different elicitation paradigms. Results showed a significant reduction of ra index with the use of more semantically complex paradigms. Therefore, the P300 BCI system seems to be affected by the structure of the elicitation paradigm, the modalities of stimulus presentation, and the complexity of stimulus recognition and semantic processing.
KW - BCI
KW - ERP
KW - P300
KW - Virtual Environment
KW - Visual Paradigms
UR - http://www.scopus.com/inward/record.url?scp=77951761929&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77951761929&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:77951761929
VL - 6
SP - 99
EP - 108
JO - PsychNology Journal
JF - PsychNology Journal
SN - 1720-7525
IS - 1
ER -