Shapiro Kimron L, Johnston Stephen J, Vogels Werner, Zaman Arshad, Roberts Neil
School of Psychology, University of Wales, Bangor, Gwynedd, UK.
Neuroreport. 2007 Mar 5;18(4):341-5. doi: 10.1097/WNR.0b013e32801299e2.
Presenting two targets for identification within a few hundred milliseconds reliably yields reduced performance on the second relative to the first. This attentional blink phenomenon has been extensively studied behaviourally but, until recently, has eluded direct investigation by functional magnetic resonance imaging. The few published imaging studies agree that the attentional blink recruits a fronto-temporo-parietal 'attentional' network. What remains controversial is the specific role played by the 'object processing' ventro-occipital regions of the brain. Two studies used different tasks and stimulus onset asynchronies leaving the cause for this divergence unknown. The present study resolves this discrepancy by examining the different methodologies. Our results suggest that task difficulty and masking must be factored in to any conclusions drawn about the brain activity during the attentional blink paradigm.
在几百毫秒内呈现两个待识别目标，相对于第一个目标，第二个目标的识别表现会可靠地降低。这种注意瞬脱现象已经在行为学上得到了广泛研究，但直到最近，它一直难以通过功能磁共振成像进行直接研究。少数已发表的成像研究一致认为，注意瞬脱会激活一个额颞顶叶“注意”网络。大脑枕叶腹侧“客体加工”区域所起的具体作用仍存在争议。两项研究使用了不同的任务和刺激呈现间隔，导致这种分歧的原因尚不清楚。本研究通过检验不同的方法解决了这一差异。我们的结果表明，在得出关于注意瞬脱范式期间大脑活动的任何结论时，必须考虑任务难度和掩蔽因素。
