用于BCI的脑电信号可以分为三类，一类是在大脑思维意识过程中自发产生的脑电（EEG）的特定频率成分；另一类是脑诱发电位（evoked potential，EP）或事件相关电位（event related potential，ERP），既由特定感观刺激所诱发的大
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第二种技术依赖于诱发电位；根据它们的源头，诱发电位是一种可能与特定的刺激相关的脑电反应。
The second technique relies on evoked potentials, which are electrical brain responses that may be related to a particular stimulus because of where they originate.
背景：关联性负变是与精神医学和心理学关系最为密切的一种脑诱发电位。
BACKGROUND: Contingent negative variation (CNV) is a kind of cerebral evoked potential, which is closely related with mental medicine and psychology.
目的：关联性负变是一种重要的脑诱发电位。
OBJECTIVE: Contingent negative variation (CNV) is an important cerebral evoked potential.
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