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首页> 外文期刊>International journal of psychophysiology: official journal of the International Organization of Psychophysiology >Effects of SOA and flash pattern manipulations on ERPs, performance, and preference: implications for a BCI system.
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Effects of SOA and flash pattern manipulations on ERPs, performance, and preference: implications for a BCI system.

机译：SOA和闪存模式操作对ERP，性能和偏好的影响：对BCI系统的影响。

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P3 brain-computer interfaces (BCIs) are synchronous communication systems that allow users to communicate interest in a target event by choosing to attend to it while ignoring other events. In such a system, a cogneme refers to the user's response to: "/attend to the event/" or "/ignore the event/". The present study examined subjects' ability to generate more cognemes per minute (by varying stimulus onset asynchrony or SOA), or requiring fewer cognemes to convey a message (by varying the pattern of stimulus presentation). Both of these have implications for improved information throughput in a P3 BCI. SOAs of 125, 250, and 500 ms were used. Additionally, the conventional "single flash" approach was compared to a new "multiple flash" condition in which half of the stimuli in an 8 x 8 grid were flashed simultaneously. In both conditions, P3-like component amplitudes decreased with faster SOAs at low target probabilities, but the trend did not hold for higher probabilities. The multiple flash condition produced more robust ERPs at the faster speeds. The results also indicate that attend/ignore differences were more apparent following multiple flashes for low target probabilities, but less apparent for high target probabilities. Although information throughput alone does not support the superiority of one approach over the other, only six cognemes are needed in the multiple flash conditions to identify a character, compared to sixteen cognemes in the single flash condition. This suggests that the former approach could operate more rapidly. Thus, the present results suggest that the multiple flash approach may be a more efficient and faster basis for a P3 BCI system.
机译：P3脑机接口（BCI）是同步通信系统，允许用户通过选择关注某个目标事件而忽略其他事件来传达其兴趣。在这样的系统中，齿轮表示用户对以下内容的响应：“ /参加事件/”或“ /忽略事件/”。本研究检查了受试者每分钟产生更多齿轮的能力（通过改变刺激发作的异步性或SOA），或需要更少的齿轮来传达信息的能力（通过改变刺激的表现方式）。两者都对提高P3 BCI中的信息吞吐量有影响。使用了125、250和500毫秒的SOA。另外，将传统的“单次闪光”方法与新的“多次闪光”条件进行了比较，在这种情况下，同时将8 x 8网格中的一半刺激闪光。在这两种情况下，在较低的目标概率下，P3样分量的幅度随SOA的增加而降低，但对于较高的概率，这种趋势并不成立。多重闪存条件以更快的速度产生了更强大的ERP。结果还表明，对于低目标概率，多次闪动后出席/忽略差异更加明显，而对于高目标概率而言，出席/忽略差异却不那么明显。尽管仅信息吞吐量不能支持一种方法相对于另一种方法的优越性，但是相比于单次闪光条件下的16个齿轮格，在多个闪光条件下仅需要6个齿轮格即可识别字符。这表明前一种方法可以更快速地运行。因此，当前结果表明，对于P3 BCI系统，多重闪存方法可能是更有效，更快速的基础。

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