Kraft Antje, Müller Notger G, Hagendorf Herbert, Schira Mark M, Dick Sandra, Fendrich Robert M, Brandt Stephan A
Department of Neurology, Charité, Berlin NeuroImaging Center, Schumannstr. 20-21, D-10117 Berlin, Germany.
Brain Res Cogn Brain Res. 2005 Jun;24(1):19-32. doi: 10.1016/j.cogbrainres.2004.12.004.
Whether attention can be split between multiple regions in space simultaneously is an ongoing controversy in attention research. We argue that the debate could be resolved if the distribution of target locations over hemifields and task difficulty are both considered. This premise was tested in five experiments in which 48 subjects compared the identity of two out of four stimuli. In an easy task, within each hemifield, performance (reaction times and error rates) was better for adjacent targets than for separated ones, but across hemifields, performance for separated and adjacent stimuli was similar. In difficult tasks, performance was always better when the stimuli were presented across the hemifields indicating a bilateral field advantage. Moreover, the difference between adjacent and separate conditions within one hemifield diminished with increasing task difficulty. We propose a modified model of visuo-spatial attention, which permits the hemispheres to maintain and control simultaneous attentional foci.
注意力能否同时分散在空间中的多个区域，这在注意力研究领域仍是一个持续存在的争议。我们认为，如果同时考虑目标位置在半视野上的分布和任务难度，这场争论或许能够得到解决。这一前提在五项实验中得到了验证，实验中48名受试者比较了四个刺激物中两个的异同。在简单任务中，在每个半视野内，相邻目标的表现（反应时间和错误率）优于分离目标，但在不同半视野之间，分离刺激和相邻刺激的表现相似。在困难任务中，当刺激物呈现在不同半视野时，表现总是更好，这表明存在双侧视野优势。此外，随着任务难度的增加，同一半视野内相邻和分离条件之间的差异会减小。我们提出了一种视觉空间注意力的修正模型，该模型允许两个半球维持和控制同时的注意力焦点。
