Slotnick Scott D, Yantis Steven
Department of Psychology, Boston College, Mcguinn Hall, Chestnut Hills, MA 02467, USA.
Brain Res Cogn Brain Res. 2005 Jun;24(1):97-108. doi: 10.1016/j.cogbrainres.2004.12.008.
Behavioral studies have suggested that bistable figure perception is mediated by spatial attention. We tested this hypothesis using event-related functional MRI. During central fixation, two tilted squares containing coherently moving dots were presented in the left and right hemifields. In the attention condition, participants were occasionally cued to shift attention between the squares. In the perception condition, corresponding corners of the squares were connected by horizontal lines producing a perceptually bistable Necker cube figure. Observers reported which of the two faces appeared 'forward' in depth; cues elicited voluntary perceptual reversals. Attending to either square during the attention condition or perceiving either square as forward during the perception condition yielded increased activity in contralateral visual areas. Furthermore, voluntary shifts of attention and voluntary shifts in perceptual configuration were associated with common activity in the posterior parietal cortex, part of the frontoparietal attentional control network. These results support the hypothesis that voluntary shifts in perceptual bistability are mediated by spatial attention.
行为学研究表明，双稳态图形感知是由空间注意力介导的。我们使用事件相关功能磁共振成像对这一假设进行了测试。在中央注视期间，在左、右半视野中呈现两个包含连贯移动点的倾斜正方形。在注意力条件下，参与者偶尔会被提示在正方形之间转移注意力。在感知条件下，正方形的对应角由水平线连接，产生一个感知上双稳态的内克尔立方体图形。观察者报告两个面中哪一个在深度上看起来“向前”；提示引发了自愿的感知反转。在注意力条件下关注任何一个正方形，或者在感知条件下将任何一个正方形感知为向前，都会导致对侧视觉区域的活动增加。此外，注意力的自愿转移和感知配置的自愿改变与顶叶后部皮质（额顶叶注意力控制网络的一部分）的共同活动有关。这些结果支持了这样一种假设，即感知双稳态的自愿改变是由空间注意力介导的。
