The Contribution of Color to Motion Processing in Macaque Middle Temporal Area

The Contribution of Color to Motion Processing in Macaque Middle Temporal Area
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颜色对猕猴中颞区运动处理的贡献

DOI:
--
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发表时间:
1999
影响因子:
5.3
通讯作者:
T. Albright
T. Albright
中科院分区:
医学1区
文献类型:
--
作者:
A. Thiele;K. Dobkins;T. Albright

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图像的色彩特性为物体边界提供了强有力的线索,因此具有促进物体运动检测的潜力。然而,皮层运动探测器利用色彩信息的程度仍然存在争议。为了进一步解决这个问题,我们使用等效亮度对比度(EqLC)范式量化了猕猴大脑皮层中颞区(MT)定向选择性神经元的色彩输入强度。在这种范例中,两个正弦光栅(一个是异色的,另一个是消色差的)叠加并沿相反方向移动,允许运动探测器对异色刺激的灵敏度进行量化,并相对于亮度定义刺激的灵敏度基准进行表达。这些实验的结果表明,当同一光栅中的亮度对比度相对较低时,移动的红绿异色光栅中的色对比度会强烈影响 MT 中的方向响应。对于此类刺激,EqLC 至少为 5%。然而,当亮度对比度添加到异色光栅时,当亮度对比度足够高(>17-23%)时,EqLC 急剧减弱并变为负值(-4%)。因此,当同时存在足够的亮度对比度时,物体的色彩特性似乎对 MT 神经元的运动处理几乎没有好处或没有好处。这些数据支持一个简单的模型,其中 MT 中的半音运动处理几乎完全由大细胞输入决定。此外,神经元和心理物理学数据的比较表明,MT 可能不是异色模式运动引起的感知体验的唯一贡献者,或者只有 MT 神经元的一个子集具有此功能。
The chromatic properties of an image yield strong cues for object boundaries and thus hold the potential to facilitate the detection of object motion. The extent to which cortical motion detectors exploit chromatic information, however, remains a matter of debate. To address this further, we quantified the strength of chromatic input to directionally selective neurons in the middle temporal area (MT) of macaque cerebral cortex using an equivalent luminance contrast (EqLC) paradigm. This paradigm, in which two sinusoidal gratings, one heterochromatic and the other achromatic, are superimposed and moved in opposite directions, allows the sensitivity of motion detectors to heterochromatic stimuli to be quantified and expressed relative to the benchmark of sensitivity for a luminance-defined stimulus. The results of these experiments demonstrate that the chromatic contrast in a moving red–green heterochromatic grating strongly influences directional responses in MT when the luminance contrast in that same grating is relatively low; for such stimuli, EqLC is at least 5%. When luminance contrast is added to the heterochromatic grating, however, EqLC wanes sharply and becomes negative (−4%) when luminance contrast is sufficiently high (>17–23%). Thus, the chromatic properties of an object appear to confer little or no benefit to motion processing by MT neurons when sufficient luminance contrast concurrently exists. These data support a simple model in which chromatic motion processing in MT is almost exclusively determined by magnocellular input. Additionally, a comparison of neuronal and psychophysical data suggests that MT may not be the sole contributor to the perceptual experience elicited by motion of heterochromatic patterns, or that only a subset of MT neurons serve this function.
DOI: 10.1523/jneurosci.14-04-02069.1994
发表时间: 1994-04
期刊: --
影响因子: --
作者:
T. Nealey;J. Maunsell
通讯作者: T. Nealey;J. Maunsell
DOI: --
发表时间: 1998
期刊: --
影响因子: --
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通讯作者: John Dowling;L. Stryer;Torsten Wiesel
DOI: 10.1113/jphysiol.1984.sp015499
发表时间: 1984-01-01
影响因子: 5.5
作者:
DERRINGTON, AM;KRAUSKOPF, J;LENNIE, P
通讯作者: LENNIE, P
DOI: 10.1113/jphysiol.1984.sp015498
发表时间: 1984-01-01
影响因子: 5.5
作者:
DERRINGTON, AM;LENNIE, P
通讯作者: LENNIE, P
DOI: 10.1523/jneurosci.10-10-03323.1990
发表时间: 1990
期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子: --
作者:
Maunsell,JH;Nealey,TA;DePriest,DD
通讯作者: DePriest,DD