Effects of SOA and flash pattern manipulations on ERPs, performance, and preference: Implications for a BCI system
Effects of SOA and flash pattern manipulations on ERPs, performance, and preference: Implications for a BCI system
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DOI：
10.1016/j.ijpsycho.2005.02.007
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发表时间：
2006-02-01
影响因子：
3
通讯作者：
Pineda, JA
中科院分区：
文献类型：
--
作者：
Allison, BZ;Pineda, JA
P3脑机接口（BCl）是一种同步通信系统，允许用户通过选择关注目标事件而忽略其他事件来传达对该事件的兴趣。在这样的系统中，认知位是指用户对以下的响应：“/关注事件/”或“/忽略事件/"。本研究考察了受试者每分钟产生更多同源素的能力（通过改变刺激起始时间或SOA），或需要更少的同源素来传达信息（通过改变刺激呈现的模式）。这两者都对P3 BCI中的改进的信息吞吐量具有影响。使用了125、250和500 ms的SOA。此外，将传统的“单次闪光”方法与新的“多次闪光”条件进行比较，其中所有8 × 8网格中的一半刺激同时闪光。在这两种情况下，P3样成分的幅度下降，更快的SOA在低目标的概率，但这种趋势并没有举行更高的概率。多次闪光条件下产生更强大的ERP在更快的速度。结果还表明，关注/忽略的差异是更明显的低目标概率多次闪光后，但不太明显的高目标概率。虽然信息吞吐量本身并不支持一种方法优于另一种方法，但与单次闪光条件下的16个同源词相比，在多次闪光条件下仅需要6个同源词来识别字符。这表明前一种方法可以更快地操作。因此，目前的结果表明，多个闪光的方法可能是一个更有效和更快的基础P3 BCI系统。(c)2005 Elsevier B. V.保留所有权利。
P3 brain-computer interfaces (BCls) 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 BCl. 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 all 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 BCl system. (c) 2005 Elsevier B.V. All rights reserved.