Functional differences between members of the P300 complex: P3e and P3b.
Functional differences between members of the P300 complex: P3e and P3b.
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P300 复合体成员之间的功能差异：P3e 和 P3b。
DOI：
10.1111/j.1469-8986.1987.tb01867.x
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发表时间：
1987
期刊：
影响因子：
3.7
通讯作者：
Mahaffey,D
中科院分区：
文献类型：
--
作者：
Ruchkin,DS;Sutton,S;Mahaffey,D
本研究的主要结果承担的P3b和更短的潜伏期，更集中分布的内源性阳性成分表示为P3e的功能作用的差异。在本文中，我们只观察到P3e与P3b的结合。与P3b的情况一样，P3e是完全内源性的，因为如果刺激省略向受试者传达了相关信息，则可以通过省略刺激来引发P3e。结果发现，P3e和P3b与信息传递的关系不同。通过改变事件概率和事件的可辨别性来操纵信息传递。P3b的众所周知的特性，即当由低概率（高信息量）事件引起时，其幅度很大，并且由于感知困难（信息丢失-含糊）而降低，在本研究中得到了复制。与P3b相反，事件概率的变化对P3e波幅没有影响，但知觉难度的增加显著降低了P3e波幅。此外，在信息性信号事件出现之前的时期，观察到两种CNV型负波：1）在头皮中央最大的负波，与受试者预测将出现罕见或频繁事件有关; 2）在枕部头皮上最大的负性与刺激有关，该刺激告知受试者随后对信号的辨别是容易还是困难。最后，还有一个偶然发现的、显然是新的短持续时间成分的阴影，暂时标记为Px，它是由信号的呈现引起的，该信号告知受试者随后的辨别是容易还是困难。
The main findings of this study bear upon differences in the functional roles of P3b and a shorter latency, more centrally distributed endogenous positive component denoted as P3e. At the present writing, we have observed P3e only in conjunction with P3b. As in the case of P3b, P3e is fully endogenous in that it can be‐ elicited by omission of a stimulus if stimulus omission conveys relevant information to the subject. It was found that P3e and P3b relate differently to information delivery. Information delivery was manipulated by varying event probabilities and the discriminability of the events. The well known properties of P3b, namely that its amplitude is large when elicited by low probability (high information content) events and is reduced by perceptual difficulty (information loss‐equivocation), were replicated in the current study. In contrast to P3b, variation of event probability had no effect upon P3e amplitude, but increased perceptual difficulty markedly reduced P3e amplitude.In addition, two CNV‐type negativities were observed in the epochs prior to presentation of the informative signal event: 1) A negativity that was maximal over central scalp related to the subject's prediction that a rare or frequent event would be presented; 2) A negativity that was maximal over occipital scalp related to a stimulus that informed the subject whether the subsequent discrimination of the signal would be easy or difficult. Finally, there was a serendipitous Hading of an apparently new short duration component, tentatively labeled Px, which is elicited by presentation of the signal that informs the subject whether the subsequent discrimination will be easy or difficult.