Boynton Geoffrey M, Ciaramitaro Vivian M, Arman A Cyrus
The Salk Institute, 10010 N. Torrey Pines Road, La Jolla, CA 92037-1099, USA.
Vision Res. 2006 Sep;46(18):2968-76. doi: 10.1016/j.visres.2006.03.003. Epub 2006 May 15.
Previous studies have shown that attention to a particular stimulus feature, such as direction of motion or color, enhances neuronal responses to unattended stimuli sharing that feature. We studied this effect psychophysically by measuring the strength of the motion aftereffect (MAE) induced by an unattended stimulus when attention was directed to one of two overlapping fields of moving dots in a different spatial location. When attention was directed to the same direction of motion as the unattended stimulus, the unattended stimulus induced a stronger MAE than when attention was directed to the opposite direction. Also, when the unattended location contained either uncorrelated motion or had no stimulus at all an MAE was induced in the opposite direction to the attended direction of motion. The strength of the MAE was similar regardless of whether subjects attended to the speed or luminance of the attended dots. These results provide further support for a global feature-based mechanism of attention, and show that the effect spreads across all features of an attended object, and to all locations of visual space.
先前的研究表明，对特定刺激特征（如运动方向或颜色）的关注会增强神经元对共享该特征的未被关注刺激的反应。我们通过测量当注意力指向不同空间位置的两个重叠移动点场之一时，未被关注刺激诱发的运动后效（MAE）的强度，从心理物理学角度研究了这种效应。当注意力指向与未被关注刺激相同的运动方向时，未被关注刺激诱发的MAE比注意力指向相反方向时更强。此外，当未被关注的位置包含不相关运动或根本没有刺激时，会在与被关注运动方向相反的方向诱发MAE。无论受试者关注的是被关注点的速度还是亮度，MAE的强度都相似。这些结果为基于全局特征的注意力机制提供了进一步支持，并表明这种效应会扩展到被关注对象的所有特征以及视觉空间的所有位置。
