Two temporal channels in human V1 identified using fMRI.
Two temporal channels in human V1 identified using fMRI.
复制标题
DOI:
10.1016/j.neuroimage.2009.03.078
复制
发表时间:
2009-08-01
期刊:
影响因子:
5.7
通讯作者:
Wandell BA
中科院分区:
文献类型:
--
作者:
Horiguchi H;Nakadomari S;Misaki M;Wandell BA
Human visual sensitivity to a fairly broad class of dynamic stimuli can be modeled accurately using two temporal channels. Here, we analyze fMRI measurements of the temporal step response to spatially uniform stimuli to estimate these channels in human primary visual cortex (V1). In agreement with the psychophysical literature, the V1 fMRI temporal responses are modeled accurately as a mixture of two (transient and sustained) channels. We derive estimates of the relative contributions from these two channels at a range of eccentricities. We find that all portions of V1 contain a significant transient response. The central visual field representation includes a significant sustained response, but the amplitude of the sustained channel signal declines with eccentricity. The sustained signals may reflect the emphasis on pattern recognition and color in the central visual field; the dominant transient response in the visual periphery may reflect responses in the human visual attention system.
登录
查看更多内容
影响因子:
10.6
作者:
Teo, PC;Sapiro, G;Wandell, BA
通讯作者:
Wandell, BA
影响因子:
5.3
作者:
Liu, JJ;Wandell, BA
通讯作者:
Wandell, BA
DOI:
10.1111/j.1460-9568.2008.06476.x
发表时间:
2008-11
期刊:
The European journal of neuroscience
影响因子:
--
作者:
Mullen KT;Dumoulin SO;Hess RF
通讯作者:
Hess RF
影响因子:
1.8
作者:
THOMPSON, P
通讯作者:
THOMPSON, P
影响因子:
3.3
作者:
Chen, W;Zhu, XH;Ugurbil, K
通讯作者:
Ugurbil, K