Crowding alters the spatial distribution of attention modulation in human primary visual cortex.
Crowding alters the spatial distribution of attention modulation in human primary visual cortex.
复制标题
DOI：
10.1167/8.9.6
复制
发表时间：
2008-07-16
影响因子：
1.8
通讯作者：
He S
中科院分区：
文献类型：
--
作者：
Fang F;He S
拥挤效应是指目标在邻近干扰物存在时，其可见性降低的现象。它被解释为前注意水平的侧抑制或注意的粗空间分辨率。为了验证这些理论，高分辨率的功能磁共振成像被用来测量V1反应的目标在存在或不存在的干扰，在有人值守和无人值守的条件。我们发现，在无人看管的条件下，大脑皮层对目标的反应不受干扰物的影响。然而，注意调制在目标及其周围区域的空间分布依赖于拥挤配置。当分心物被放置在同一径向轴的目标，配置具有严重的拥挤效应，显着的注意力增强，观察不仅在目标和分心物的位置，而且在区域旁边的目标，甚至没有刺激。但是，当干扰物与目标物被放置在同一圆周上时，注意力增强的这种传播并没有发生，这种配置具有弱的拥挤效应。注意与目标-干扰物配置之间的交互模式支持拥挤是由注意的粗空间分辨率引起的。
Crowding effect is the visibility reduction of a target when presented with neighboring distractors. It has been explained by either lateral inhibition at a pre-attentive level or coarse spatial resolution of attention. To test these theories, high-resolution fMRI was used to measure V1 response to the target in the presence or the absence of the distractors in both attended and unattended conditions. We found the cortical response to the target was not affected by the presence of distractors in the unattended condition. However, the spatial distribution of attention modulation in the target and its surrounding area depended on the crowding configuration. When distractors were placed in the same radial axis as the target, a configuration with a severe crowding effect, significant attention enhancements were observed not only in the target's and the distractors' locations, but also in regions next to the target where even no stimulus was presented. But this spread of attention enhancement did not occur when distractors were placed in the same circumference as the target, a configuration with a weak crowding effect. The pattern of interaction between attention and target-distractor configuration supports that crowding results from coarse spatial resolution of attention.
登录
查看更多内容
影响因子：
2.5
作者：
Cavanaugh, JR;Bair, W;Movshon, JA
通讯作者：
Movshon, JA
DOI：
10.3758/bf03213822
发表时间：
1979-01-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
BANKS, WP;LARSON, DW;PRINZMETAL, W
通讯作者：
PRINZMETAL, W
影响因子：
1.8
作者：
Strasburger, H
通讯作者：
Strasburger, H
DOI：
10.3758/bf03211742
发表时间：
1993-06-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
ANDERSEN, GJ;KRAMER, AF
通讯作者：
KRAMER, AF
影响因子：
64.8
作者：
He, S;Cavanagh, P;Intriligator, J
通讯作者：
Intriligator, J