Stein Timo, Vallines Ignacio, Schneider Werner X
Department of Psychology, Ludwig-Maximilians-Universität Munich, Munich, Germany.
Neuroreport. 2008 Aug 27;19(13):1277-81. doi: 10.1097/WNR.0b013e32830bab02.
When two masked targets are presented in a rapid sequence, attentional limitations are reflected in reduced identification accuracy for the second target (T2). We used functional magnetic resonance imaging to disentangle the distinct neural substrates of T2 processing during this attentional blink phenomenon. Spatially separating the two targets allows the retinotopic localization of the different stimuli's encoding sites in primary visual cortex (V1) and thus enables activation elicited by each target to be differentially measured in V1. The encoding location of the second target mirrored T2 identification accuracy in a retinotopically specific manner. These results are the first evidence for effects of behavioral performance on hemodynamic responses in V1 under conditions of the attentional blink.
当两个带掩蔽的目标以快速序列呈现时，注意力限制表现为对第二个目标（T2）的识别准确率降低。我们使用功能磁共振成像来解析在这种注意瞬脱现象期间T2加工的不同神经基质。在空间上分离这两个目标，可以对初级视觉皮层（V1）中不同刺激的编码位点进行视网膜定位，从而能够在V1中差异测量每个目标引发的激活。第二个目标的编码位置以视网膜定位特异性方式反映了T2识别准确率。这些结果是注意瞬脱条件下行为表现对V1中血液动力学反应影响的首个证据。
