Artif Intell Med - Brain Painting: usability testing according to the user-centered design in end users with severe motor paralysis.

Tópicos

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Resumo

CKGROUND: For many years the reestablishment of communication for people with severe motor paralysis has been in the focus of brain-computer interface (BCI) research. Recently applications for entertainment have also been developed. Brain Painting allows the user creative expression through painting pictures.OBJECTIVE: The second, revised prototype of the BCI Brain Painting application was evaluated in its target function - free painting - and compared to the P300 spelling application by four end users with severe disabilities.METHODS: According to the International Organization for Standardization (ISO), usability was evaluated in terms of effectiveness (accuracy), efficiency (information transfer rate (ITR)), utility metric, subjective workload (National Aeronautics and Space Administration Task Load Index (NASA TLX)) and user satisfaction (Quebec User Evaluation of Satisfaction with assistive Technology (QUEST) 2.0 and Assistive Technology Device Predisposition Assessment (ATD PA), Device Form).RESULTS: The results revealed high performance levels (M=80% accuracy) in the free painting and the copy painting conditions, ITRs (4.47-6.65bits/min) comparable to other P300 applications and only low to moderate workload levels (5-49 of 100), thereby proving that the complex task of free painting did neither impair performance nor impose insurmountable workload. Users were satisfied with the BCI Brain Painting application. Main obstacles for use in daily life were the system operability and the EEG cap, particularly the need of extensive support for adjustment.CONCLUSION: The P300 Brain Painting application can be operated with high effectiveness and efficiency. End users with severe motor paralysis would like to use the application in daily life. User-friendliness, specifically ease of use, is a mandatory necessity when bringing BCI to end users. Early and active involvement of users and iterative user-centered evaluation enable developers to work toward this goal.

Resumo Limpo

ckground mani year reestablish communic peopl sever motor paralysi focus braincomput interfac bci research recent applic entertain also develop brain paint allow user creativ express paint picturesobject second revis prototyp bci brain paint applic evalu target function free paint compar p spell applic four end user sever disabilitiesmethod accord intern organ standard iso usabl evalu term effect accuraci effici inform transfer rate itr util metric subject workload nation aeronaut space administr task load index nasa tlx user satisfact quebec user evalu satisfact assist technolog quest assist technolog devic predisposit assess atd pa devic formresult result reveal high perform level m accuraci free paint copi paint condit itr bitsmin compar p applic low moder workload level therebi prove complex task free paint neither impair perform impos insurmount workload user satisfi bci brain paint applic main obstacl use daili life system oper eeg cap particular need extens support adjustmentconclus p brain paint applic can oper high effect effici end user sever motor paralysi like use applic daili life userfriendli specif eas use mandatori necess bring bci end user earli activ involv user iter usercent evalu enabl develop work toward goal

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