The effect of repetition lag on electrophysiological and haemodynamic correlates of visual object priming
The effect of repetition lag on electrophysiological and haemodynamic correlates of visual object priming
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DOI：
10.1016/j.neuroimage.2003.12.020
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发表时间：
2004-04-01
期刊：
影响因子：
5.7
通讯作者：
Rugg, MD
中科院分区：
文献类型：
--
作者：
Henson, RN;Rylands, A;Rugg, MD
利用头皮事件相关电位（ERPs）和事件相关功能磁共振成像（efMRI）研究了快速语义判断任务中视觉对象第一次和第二次呈现之间的滞后对重复效应的调制。在一个单一的会话中使用了四个级别的滞后，从零到一，到几十个干预刺激，并允许从时间的影响干扰的影响部分分离。反应时（RTs）表明，重复启动的幅度随着滞后的增加而减少。ER-P数据显示两种不同的重复效果，一个在150和300毫秒之间的刺激后，另一个在400和600毫秒之间。这两种效果的大小，特别是早期的，随着滞后的增加而减少。功能磁共振成像数据显示，与重复相关的血流动力学反应在几个下枕颞区减少，其幅度也通常随着滞后的增加而减少。在一般情况下，与预期相反，滞后似乎主要有三种类型的因变量的定量影响：几乎没有证据表明在不同的滞后重复效应的神经相关的质的差异。(C)2004爱思唯尔公司All rights reserved.
The modulation of repetition effects by the lag between first and second presentations of a visual object during a speeded semantic judgment task was examined using both scalp event-related potentials (ERPs) and event-related functional magnetic resonance imaging (efMRI). Four levels of lag were used within a single session, from zero to one, to tens of intervening stimuli, and which allowed partial separation of the effects of interference from the effects of time. Reaction times (RTs) showed that the magnitude of repetition priming decreased as lag increased. The ER-P data showed two distinct effects of repetition, one between 150 and 300 ms post stimulus and another between 400 and 600 ms. The magnitude of both effects, particularly the earlier one, decreased as lag increased. The fMRI data showed a decrease in the haemodynamic response associated with repetition in several inferior occipitotemporal regions, the magnitude of which also typically decreased as lag increased. In general, and contrary to expectations, lag appeared to have mainly quantitative effects on the three types of dependent variable: there was little evidence for qualitative differences in the neural correlates of repetition effects at different lags. (C) 2004 Elsevier Inc. All rights reserved.