Pause B M, Sojka B, Krauel K, Ferstl R
Institute of Psychology, Christian-Albrechts-Universität, Kiel, Germany.
Psychophysiology. 1996 Jul;33(4):376-84. doi: 10.1111/j.1469-8986.1996.tb01062.x.
The olfactory event-related potential (OERP) has been described as being dependent on exogenous stimulus features, but no effort has been made to examine possible endogenous determinants. We wanted to separate exogenous and endogenous components of the OERP by using an olfactory oddball paradigm. A high concentration of citral was used as the target stimulus, and a low concentration was used as the standard stimulus. Odors were presented within a constantly flowing air stream. We found that the early components of the OERP (N1, P2) are modulated by the stimulus concentration, whereas the late positive components (P3-1, P3-2) vary depending on the subjective stimulus significance and stimulus probability. It is concluded that the positive component of the OERP, which has been formerly explained by chemical and physical stimulus features, is actually determined by endogenous processes.
嗅觉事件相关电位（OERP）已被描述为依赖于外源性刺激特征，但尚未有人致力于研究可能的内源性决定因素。我们希望通过使用嗅觉oddball范式来分离OERP的外源性和内源性成分。高浓度的柠檬醛用作目标刺激，低浓度用作标准刺激。气味在持续流动的气流中呈现。我们发现，OERP的早期成分（N1、P2）受刺激浓度调制，而晚期正性成分（P3-1、P3-2）则因主观刺激显著性和刺激概率而异。得出的结论是，OERP的正性成分以前被解释为化学和物理刺激特征，实际上是由内源性过程决定的。
