Verleger Rolf, Görgen Stefani, Jaśkowski Piotr
Department of Neurology, University of Lübeck, Lübeck, Germany.
Psychophysiology. 2005 Nov;42(6):677-90. doi: 10.1111/j.1469-8986.2005.354.x.
Briefly presented arrows, made indistinguishable by masks that contain arrows, inversely prime responses to following visible arrows. This inverse effect might reflect general regularities of masked priming or be either due to the task-relevant elements of the mask or to special features of arrows. Here we report a slow negative EEG potential recorded from the scalp above the visual cortex, which is evoked by masks that contain arrows. Even being evoked when arrows masks were presented in isolation, this "Nd-mask" appeared to be an obligatory response. Yet Nd-mask was enhanced when primes and targets were arrows and was reduced in the other cases, and even reversed its polarity with appropriate control stimuli. These findings provide support both for the special status of arrows and for the notion of mask relevance. Nd-mask might be one instance of negative EEG potentials evoked by stimuli with familiar gestalts.
简要呈现的箭头，被包含箭头的掩蔽物弄得难以区分，会对随后可见的箭头产生反向启动效应。这种反向效应可能反映了掩蔽启动的一般规律，或者是由于掩蔽物与任务相关的元素，或者是由于箭头的特殊特征。在此我们报告，从视觉皮层上方头皮记录到的一种缓慢负性脑电电位，它由包含箭头的掩蔽物诱发。即使在单独呈现箭头掩蔽物时被诱发，这种“Nd-掩蔽”似乎也是一种必然反应。然而，当启动刺激和目标刺激都是箭头时，Nd-掩蔽会增强，在其他情况下则会减弱，甚至在适当的对照刺激下其极性会反转。这些发现既支持了箭头的特殊地位，也支持了掩蔽相关性的概念。Nd-掩蔽可能是由具有熟悉图形的刺激诱发的负性脑电电位的一个实例。
