Visual spatial attention enhances the amplitude of positive and negative fMRI responses to visual stimulation in an eccentricity-dependent manner.
Visual spatial attention enhances the amplitude of positive and negative fMRI responses to visual stimulation in an eccentricity-dependent manner.
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DOI：
10.1016/j.visres.2013.03.009
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发表时间：
2013-06-07
期刊：
影响因子：
1.8
通讯作者：
Silver, Michael A.
中科院分区：
文献类型：
--
作者：
Bressler, David W.;Fortenbaugh, Francesca C.;Robertson, Lynn C.;Silver, Michael A.
内源性视觉空间注意改善感知，增强神经反应的视觉刺激在出席的地点。虽然视觉处理的许多方面在中央视觉和周边视觉之间存在显着差异，但关于空间注意效应的偏心依赖性的神经基质知之甚少。我们测量了大量的地形组织的皮层区域的偏心率的函数的视觉刺激的积极和消极的fMRI反应的幅度。每个刺激的反应时，得到的刺激出席，当空间注意力被定向到一个刺激在相反的视觉半野。在我们研究的所有皮层区域中，注意刺激增加了正反应和负反应幅度：V1，V2，V3，hV 4，VO 1，LO 1，LO 2，V3 A/B，IPS 0，TO 1和TO 2。然而，这些影响的偏心率依赖性在皮层区域有很大的不同。在早期的视觉，腹侧和侧枕叶皮层，注意力增强的积极反应是更大的中央相比，周边偏心。相反的模式，观察到在背流区IPS 0和推定的MT同源TO 1，在那里注意力增强的积极反应是更大的外围。负性功能磁共振成像反应的注意力调制的幅度和偏心率依赖性密切反映了跨皮层区域的正性反应。
Endogenous visual spatial attention improves perception and enhances neural responses to visual stimuli at attended locations. Although many aspects of visual processing differ significantly between central and peripheral vision, little is known regarding the neural substrates of the eccentricity dependence of spatial attention effects. We measured amplitudes of positive and negative fMRI responses to visual stimuli as a function of eccentricity in a large number of topographically-organized cortical areas. Responses to each stimulus were obtained when the stimulus was attended and when spatial attention was directed to a stimulus in the opposite visual hemifield. Attending to the stimulus increased both positive and negative response amplitudes in all cortical areas we studied: V1, V2, V3, hV4, VO1, LO1, LO2, V3A/B, IPS0, TO1, and TO2. However, the eccentricity dependence of these effects differed considerably across cortical areas. In early visual, ventral, and lateral occipital cortex, attentional enhancement of positive responses was greater for central compared to peripheral eccentricities. The opposite pattern was observed in dorsal stream areas IPS0 and putative MT homolog TO1, where attentional enhancement of positive responses was greater in the periphery. Both the magnitude and the eccentricity dependence of attentional modulation of negative fMRI responses closely mirrored that of positive responses across cortical areas.
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DOI：
10.1073/pnas.0504136102
发表时间：
2005-07-05
影响因子：
11.1
作者：
Fox, MD;Snyder, AZ;Raichle, ME
通讯作者：
Raichle, ME
影响因子：
5.7
作者：
Jenkinson, M;Bannister, P;Smith, S
通讯作者：
Smith, S
影响因子：
5.7
作者：
Bressler, David W.;Silver, Michael A.
通讯作者：
Silver, Michael A.
DOI：
10.3758/bf03208380
发表时间：
1995-11-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
CARRASCO, M;EVERT, DL;KATZ, SM
通讯作者：
KATZ, SM
影响因子：
1.8
作者：
Carrasco, Marisa;Williams, Patrick E;Yeshurun, Yaffa
通讯作者：
Yeshurun, Yaffa