Electronics-Inspired Interdisciplinary Research Institute, Toyohashi University of Technology, Toyohashi, Aichi, Japan.
Department of Computer Science and Engineering, Toyohashi University of Technology, Toyohashi, Aichi, Japan.
PLoS One. 2020 Jul 2;15(7):e0235309. doi: 10.1371/journal.pone.0235309. eCollection 2020.
Recent researches revealed that the EEG component caused by the flickering visual stimulus, which is called steady-state visually evoked potential (SSVEP), might be a potential index for object recognition. This study examined whether SSVEP reflects different states during object recognition. In one trial, a binary image (BI), which is difficult to recognize, was followed by a grayscale image (GI) of the same object as the answer. Both BI and GI were presented in a flickering manner at a frequency of 7.5 Hz. Participants were first asked to answer whether they could recognize BI. Then, after GI was shown, participants were requested to answer whether they recognized it. We analyzed the evoked and induced component of SSVEPs from the two recognition conditions. As a result, the SSVEPs to BI were significantly larger than that to GI. In addition, induced component to GI after the BI was unrecognized was smaller than after the BI was recognized. The present data provide evidence that SSVEPs reflect a transition of cognitive state to ambiguous figures is reflected.
最近的研究表明，闪烁视觉刺激引起的 EEG 成分，即稳态视觉诱发电位（SSVEP），可能是物体识别的潜在指标。本研究探讨了 SSVEP 是否反映了物体识别过程中的不同状态。在一次试验中，呈现一个难以识别的二值图像（BI），随后呈现相同物体的灰度图像（GI）作为答案。BI 和 GI 以 7.5 Hz 的频率闪烁呈现。参与者首先被要求回答他们是否能够识别 BI。然后，在显示 GI 后，要求参与者回答他们是否识别出来。我们分析了来自两种识别条件的 SSVEP 的诱发和诱导成分。结果表明，BI 的 SSVEP 明显大于 GI 的 SSVEP。此外，在 BI 未被识别后，GI 的诱导成分小于 BI 被识别后的诱导成分。本研究数据提供了证据，表明 SSVEP 反映了认知状态向模糊图形的转变。
