Graded effects of spatial and featural attention on human area MT and associated motion processing areas
Graded effects of spatial and featural attention on human area MT and associated motion processing areas
复制标题
DOI：
10.1152/jn.1997.78.1.516
复制
发表时间：
1997-07-01
影响因子：
2.5
通讯作者：
DeYoe, EA
中科院分区：
文献类型：
--
作者：
Beauchamp, MS;Cox, RW;DeYoe, EA
功能性磁共振成像被用来量化的影响，在正常人受试者的中颞视觉区和相关的运动处理区域（hMT+）的大脑活动的空间和功能性注意的变化。当受试者进行的歧视任务，将他们的空间注意力周围提出的环和他们的功能注意力的速度点在环，活动在hMT+是最大的。如果受试者被要求区分环中点的颜色，hMT+的激活幅度和体积分别下降到先前观察到的最大反应的64%和35%。在另一个实验中，受试者被要求将他们的空间注意力从环带转移到注视点，以检测亮度的细微变化。响应幅度和音量降至最大值的40%和9%。这些实验表明，空间和功能的注意力调节hMT+和他们的效果可以协同工作，以调节皮层活动。注意力的高度调节表明，对视觉皮层刺激驱动特性的理解需要与任务相关因素对视觉处理的影响的调查相补充。
Functional magnetic resonance imaging was used to quantify the effects of changes in spatial and featural attention on brain activity in the middle temporal visual area and associated motion processing regions (hMT+) of normal human subjects. When subjects performed a discrimination task that directed their spatial attention to a peripherally presented annulus and their featural attention to the speed of points in the annulus, activity in hMT+ was maximal. If subjects were instead asked to discriminate the color of points in the annulus, the magnitude and volume of activation in hMT+ fell to 64 and 35%, respectively, of the previously observed maximum response. In another experiment, subjects were asked to direct their spatial attention away from the annulus toward the fixation point to detect a subtle change in luminance. The response magnitude and Volume dropped to 40 and 9% of maximum. These experiments demonstrate that both spatial and featural attention modulate hMT+ and that their effects can work in concert to modulate cortical activity. The high degree of modulation by attention suggests that an understanding of the stimulus-driven properties of visual cortex needs to be complemented with an investigation of the effects of task-related factors on visual processing.