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Brain Computer Interfaces (BCIs) might be the only communication resort for patients with Locked In Syndrome (LIS). Auditory-P300-based interfaces might provide an communication alternative to such patients. In this study we evaluate in an on-line setting the Emotiv's Epoc performance for capturing auditory P300s. Five healthy subjects (3 male, 2 female) participated in an on-line multi-class auditory oddball paradigm. The stimuli set consisted of six musical instruments sounds, different in pitch and stereo spatialization. Two different conditions of 300 ms and 175 ms Inter Stimuli Interval (ISI) were tested. In each condition, the training data consisted of 10 sub-trial recordings, each sub-trial consisting of 25 repetitions in the 175 ms condition and of 15 ms in the 300m s condition. At the beginning of each sub-trial a target sound was presented for the subjects to focus on. Each repetition consisted of a randomized sequence of 6 stimuli appearing once each. After training a spatial filter using xDawn unsupervised algorithm and a linear discriminant analysis (LDA) classifier on a window from 250 ms to 750 ms after the stimuli presentation, the average on-line performance was 97,5% in the 175 ms condition and 90% in the 300 ms condition, resulting in an average information transfer rate (ITR) of 5.39 bits/min -in the 175 ms condition-. The average ITR is found to be 8.88 bits/min when taking into account the minimum number of repetitions is to achieve 70% accuracy, while the best performance was 9.99 bits/min.
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