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. 2013 Jul 24;7:129. doi: 10.3389/fnins.2013.00129

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Copyright © 2013 Kaufmann, Holz and Kübler.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

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Comparison of ERPs elicited in a four-choice tactile BCI with different stimulus parameters. Stimulus duration (SD) was either long (520 ms) or short (220 ms). Inter-stimulus interval (ISI) was short (200 ms), medium (520 ms) or long (800 ms). Three combinations of SD and ISI were tested exploratory, i.e., (1) SD_long + ISI_short, (2) SD_long + ISI_medium, and (3) SD_short + ISI_long. Please note that for the third combination, more data was available. For comparison, we thus reduced the amount of data to similar size for all conditions. Yet, the full data set is depicted in the plot on the right.