注意力的皮层下调制可对抗变化盲视。
Subcortical modulation of attention counters change blindness.
作者信息
Cavanaugh James, Wurtz Robert H
机构信息
Laboratory of Sensorimotor Research, National Eye Institute, National Institutes of Health, Bethesda, Maryland 20817, USA.
出版信息
J Neurosci. 2004 Dec 15;24(50):11236-43. doi: 10.1523/JNEUROSCI.3724-04.2004.
Change blindness is the failure to see large changes in a visual scene that occur simultaneously with a global visual transient. Such visual transients might be brief blanks between visual scenes or the blurs caused by rapid or saccadic eye movements between successive fixations. Shifting attention to the site of the change counters this "blindness" by improving change detection and reaction time. We developed a change blindness paradigm for visual motion and then showed that presenting an attentional cue diminished the blindness in both humans and old world monkeys. We then replaced the visual cue with weak electrical stimulation of an area in the monkey's brainstem, the superior colliculus, to see if activation at such a late stage in the eye movement control system contributes to the attentional shift that counters change blindness. With this stimulation, monkeys more easily detected changes and had shorter reaction times, both characteristics of a shift of attention.
变化盲视是指无法察觉到视觉场景中与全局视觉瞬变同时发生的大的变化。这种视觉瞬变可能是视觉场景之间的短暂空白，或者是连续注视之间快速或扫视眼动引起的模糊。将注意力转移到变化发生的位置，通过提高变化检测能力和反应时间，可以抵消这种“盲视”。我们开发了一种用于视觉运动的变化盲视范式，然后表明呈现一个注意力提示会减少人类和旧世界猴子的盲视。然后，我们用对猴子脑干中一个区域——上丘的弱电刺激取代了视觉提示，以研究在眼动控制系统如此后期的阶段激活是否有助于抵消变化盲视的注意力转移。通过这种刺激，猴子更容易检测到变化，并且反应时间更短，这两者都是注意力转移的特征。
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