Alexander Joel E, Alexander Ronald G, Crowson Ben, Machan Kelly, Hall Carrie-Ann, Lockwood Denesa, Godinez Detre
Psychology Division, Western Oregon University, Monmouth, OR 97361, USA.
Percept Mot Skills. 2005 Apr;100(2):409-20. doi: 10.2466/pms.100.2.409-420.
The effects of self evaluation on the P300 event-related potential (ERP) were explored with 56 participants (16 men, 40 women; M age = 23.4 yr., SD = 1.2) across three conditions. The conditions included (1) a standard ERP auditory oddball discrimination between a random target (15% occurrence) and standard stimuli (85% occurrence), (2) the oddball task followed by the additional cognitive task of maintaining a mental count of the target tones, and (3) the oddball task followed by the additional cognitive task of self-evaluating whether they felt surprised by the current occurrence of the target tone. The added cognitive requirements for Conditions 2 and 3 required the subjects to maintain a cognitive readiness for the secondary stimulus-related task during their sensory discrimination response for the standard oddball task. During the self-evaluation condition, the P300 amplitude was significantly larger across all recording locations than the regular oddball condition and the cognitive count condition.
通过56名参与者（16名男性，40名女性；平均年龄=23.4岁，标准差=1.2）在三种条件下探讨了自我评估对P300事件相关电位（ERP）的影响。这些条件包括：（1）在随机目标（出现概率15%）和标准刺激（出现概率85%）之间进行标准的ERP听觉Oddball辨别；（2）Oddball任务之后进行额外的认知任务，即对目标音调进行心算；（3）Oddball任务之后进行额外的认知任务，即自我评估他们是否对当前目标音调的出现感到惊讶。条件2和3中增加的认知要求要求受试者在对标准Oddball任务进行感觉辨别反应时，对与次要刺激相关的任务保持认知准备状态。在自我评估条件下，所有记录位置的P300波幅均显著大于常规Oddball条件和认知计数条件。
