Kamikawa Yusuke, Tanaka Toshihisa
Annu Int Conf IEEE Eng Med Biol Soc. 2015;2015:6654-7. doi: 10.1109/EMBC.2015.7319919.
Posterior parietal cortex (PPC) is considered to be related to forming of motor intention. The detection of the direction intended movements and the type of intended movement is a challenging goal in neuroscience and engineering applications such as brain-computer interfacing (BCI). In previous studies, it has been reported that EEG signals extracted from PPC can be used to decode intended movement direction. However, it is not clear whether extracted EEG signals are related to motor intention, because visually evoked potential (VEP) which evoked by visual cue in their experiment may be included in their extracted EEG signals. The purpose of this study is to investigate the possibility of VEP mixed into extracted EEG signals. Therefore experiments with not only visual but also tactile cues were conducted. EEG components that could be related to PPC were extracted by using independent component analysis (ICA). We compared event related potential (ERP) waveforms between two experiments. In the result, ERP waveforms of the experiment with tactile cue were significantly different from that of the experiment with visual cue. This result suggests that VEP was included in the EEG signals extracted from PPC in the experiment with visual cue.
顶叶后皮质（PPC）被认为与运动意图的形成有关。在神经科学和诸如脑机接口（BCI）等工程应用中，检测预期运动的方向和预期运动的类型是一个具有挑战性的目标。在先前的研究中，有报道称从PPC提取的脑电图（EEG）信号可用于解码预期运动方向。然而，尚不清楚提取的EEG信号是否与运动意图相关，因为在他们的实验中由视觉线索诱发的视觉诱发电位（VEP）可能包含在提取的EEG信号中。本研究的目的是调查VEP混入提取的EEG信号中的可能性。因此，不仅进行了视觉线索实验，还进行了触觉线索实验。通过使用独立成分分析（ICA）提取可能与PPC相关的EEG成分。我们比较了两个实验之间的事件相关电位（ERP）波形。结果，触觉线索实验的ERP波形与视觉线索实验的ERP波形有显著差异。这一结果表明，在视觉线索实验中，从PPC提取的EEG信号中包含了VEP。
