Endogenous components of ERP: The P300 potential (P3 wave) of abnormal degree among every group was different.
①事件相关电 位的内 源成分：P300电 位（即P3波）在各组间异常程度不同。
CONCLUSION: P300 potential can be used as an index to assess the cognition of gastrointestinal cancer patients.
结论：P 300电位可作为消化道恶性肿瘤患者的认知状况的评价指标。
AIM: to assess the association of negative emotion with cognition to the disease in patients with gastrointestinal cancer objectively by using P300 potential.
目的：消化道恶性肿瘤患者负性情绪与其对疾病的认知状态相关，用P 300可客观评估这一现象。
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