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首页> 外文会议>Annual International Conference of the IEEE Engineering in Medicine and Biology Society >Single-trial classification of neural responses evoked in rapid serial visual presentation: Effects of stimulus onset asynchrony and stimulus repetition
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Single-trial classification of neural responses evoked in rapid serial visual presentation: Effects of stimulus onset asynchrony and stimulus repetition

机译：快速连续视觉表现引起的神经反应的单次试验分类：刺激发作异步和刺激重复的影响

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Rapid serial visual presentation (RSVP) tasks, in which participants are presented with a continuous sequence of images in one location, have been used in combination with electroencephalography (EEG) in a variety of Brain-Machine Interface (BMI) applications. The RSVP task is advantageous because it can be performed at a high temporal rate. The rate of the RSVP sequence is controlled by the stimulus onset asynchrony (SOA) between subsequent stimuli. When used within the context of a BMI, an RSVP task with short SOA could increase the information throughput of the system while also allowing for stimulus repetitions. However, reducing the SOA also increases the perceptual degradation caused by presenting two stimuli in close succession, and it decreases the target-to-target interval (TTI), which can increase the cognitive demands of the task. These negative consequences of decreasing the SOA could affect on the EEG signal measured in the task and degrade the performance of the BMI. Here we systematically investigate the effects of SOA and stimulus repetition (r) on single-trial target detection in an RSVP task. Ten healthy volunteers participated in an RSVP task in four conditions that varied in SOA and repetitions (SOA=500 ms, r=1; SOA=250 ms, r=2; SOA=166 ms, r=3; and SOA=100 ms, r=5) while processing time across conditions was controlled. There were two key results: First, when controlling for the number of repetitions, single-trial performance increases when the SOA decreases. Second, when the repetitions were combined, the best performance (AUC=0.967) was obtained with the shortest SOA (100 ms). These results suggest that shortening the SOA in an RSVP task has the benefit of increasing the performance relative to longer SOAs, and it also allows a higher number of repetitions of the stimuli in a limited amount of time.
机译：快速串行视觉呈现（RSVP）任务（其中在一个位置向参与者呈现连续的图像序列）已与脑电图（EEG）结合用于各种脑机接口（BMI）应用程序中。 RSVP任务是有利的，因为它可以高时间速率执行。 RSVP序列的速率受后续刺激之间的刺激发作异步（SOA）控制。当在BMI的上下文中使用时，具有短SOA的RSVP任务可以增加系统的信息吞吐量，同时还允许重复刺激。但是，减少SOA还会增加由于连续两次出现刺激而导致的感知退化，并且会减小目标到目标间隔（TTI），这可能会增加任务的认知需求。降低SOA的这些负面后果可能会影响任务中测得的EEG信号并降低BMI的性能。在这里，我们系统地研究了SOA和刺激重复（r）对RSVP任务中的单次试验目标检测的影响。十名健康志愿者在四个条件下参加了RSVP任务，这些条件在SOA和重复中有所不同（SOA = 500毫秒，r = 1; SOA = 250毫秒，r = 2; SOA = 166毫秒，r = 3; SOA = 100毫秒） ，r = 5），同时控制了跨条件的处理时间。有两个关键结果：首先，当控制重复次数时，当SOA降低时，单次试用性能会提高。其次，当重复进行合并时，使用最短的SOA（100毫秒）可获得最佳性能（AUC = 0.967）。这些结果表明，相对于较长的SOA，缩短RSVP任务中的SOA具有提高性能的好处，并且还允许在有限的时间内进行更多次重复刺激。

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