Dissociation of neuronal and psychophysical responses to local and global motion.
Dissociation of neuronal and psychophysical responses to local and global motion.
复制标题
DOI：
10.1016/j.cub.2011.10.049
复制
发表时间：
2011-12-06
期刊：
影响因子：
9.2
通讯作者：
Movshon, J. Anthony
中科院分区：
文献类型：
--
作者：
Hedges, James H.;Gartshteyn, Yevgeniya;Kohn, Adam;Rust, Nicole C.;Shadlen, Michael N.;Newsome, William T.;Movshon, J. Anthony
MT（V5）区的大多数神经元具有强烈的方向选择性，它们的活动与视觉运动的感知密切相关[评论于]。这些神经元具有较大的感受野，是通过将输入与响应局部运动的较小感受野相结合而构建的。人类整合大面积的运动，并且可以感知所谓的全局运动。 MT 感受野的大尺寸和方向选择性表明 MT 神经元可能代表全局运动。我们通过测量对刺激的反应来探索这种可能性，其中同时呈现的局部和全局运动的方向是独立控制的。令人惊讶的是，MT 响应仅取决于局部运动，而不受全局运动的影响。然而，在类似的条件下，人类观察者感知全局运动，并且在辨别局部运动方面受到损害。虽然局部运动感知可能取决于 MT 信号，但全局运动感知取决于与 MT 中的机制本质上不同的机制。因此，运动感知并不依赖于单个皮质区域，而是反映了多个大脑系统的动作和相互作用。
Most neurons in area MT (V5) are strongly direction selective, and their activity is closely associated with the perception of visual motion [reviewed in ]. These neurons have large receptive fields, built by combining inputs with smaller receptive fields that respond to local motion. Humans integrate motion over large areas and can perceive what has been referred to as global motion. The large size and direction selectivity of MT receptive fields suggests that MT neurons may represent global motion. We have explored this possibility by measuring responses to a stimulus in which the directions of simultaneously presented local and global motion are independently controlled. Surprisingly, MT responses depended only on the local motion, and were unaffected by the global motion. Yet, under similar conditions, human observers perceive global motion, and are impaired in discriminating local motion. While local motion perception might depend on MT signals, global motion perception depends on mechanisms qualitatively different from those in MT. Motion perception therefore does not depend on a single cortical area, but reflects the action and interaction of multiple brain systems.
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
影响因子：
2.5
作者：
MAUNSELL, JHR;VANESSEN, DC
通讯作者：
VANESSEN, DC
影响因子：
2.5
作者：
Ilg, UJ;Churan, J
通讯作者：
Churan, J
影响因子：
5.3
作者：
Priebe, NJ;Churchland, MM;Lisberger, SG
通讯作者：
Lisberger, SG
影响因子：
2.5
作者：
MIKAMI, A;NEWSOME, WT;WURTZ, RH
通讯作者：
WURTZ, RH