Specializations for chromatic and temporal signals in human visual cortex
Specializations for chromatic and temporal signals in human visual cortex
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DOI：
10.1523/jneurosci.4206-04.2005
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发表时间：
2005-03-30
影响因子：
5.3
通讯作者：
Wandell, BA
中科院分区：
文献类型：
--
作者：
Liu, JJ;Wandell, BA
神经学案例研究和定性测量表明，人类纹外皮层内的区域专门用于不同的感知功能，包括颜色。然而，很少有定量测量人类纹外颜色专业化。我们使用功能性磁共振成像研究了几个不同的人类视野图集群的色和时间响应。在不同的时间频率下测量亮度[（L + M）-视锥]、红-绿[（L-M）-视锥]和蓝-黄（S-视锥）调制的对比度响应函数。在初级视皮层（V1）中，对亮度和红-绿色调制的时间响应在高达10 Hz时近似恒定，但对蓝-黄调制的时间响应显著降低。在腹侧枕叶皮层（V0），所有的颜色引起强烈的反应，并且，对于每种颜色，低时间频率调制比高时间频率调制更有效。因此，V0表示颜色信息的全范围，但不能很好地响应快速调制。相反，在人类运动选择性皮层（MT +）和V3 A，蓝黄色调制引起非常弱的反应，而亮度和红绿色高时间频率调制是同样或更有效的比低时间频率调制。因此，这些背枕区响应快速调制，但不是所有的颜色信息表示。与人类运动感知相似，MT+和V3 A对所有时间频率都有强烈的响应，但只对某些颜色有响应。与人类的颜色感知类似，V0对所有颜色都有强烈的反应，但仅对相对较低的时间频率有反应。
Neurological case studies and qualitative measurements suggest that regions within human extrastriate cortex are specialized for different perceptual functions, including color. However, there are few quantitative measurements of human extrastriate color specializations. We studied the chromatic and temporal responses in several different clusters of human visual field maps using functional magnetic resonance imaging. Contrast response functions were measured for luminance [(L + M)-cone], red-green [(L - M)- cone] and blue yellow (S-cone) modulations at various temporal frequencies. In primary visual cortex (V1), temporal responsivities to luminance and red - green modulations are approximately constant up to 10 Hz, but responsivities to blue - yellow modulations decrease significantly. In ventral occipital cortex (V0), all colors elicit strong responses, and, for each color, low temporal frequency modulations are more effective than high temporal frequency modulations. Hence, V0 represents the full range of color information but does not respond well to rapid modulations. Conversely, in human motion-selective cortex (MT +) and V3A, blue-yellow modulations elicit very weak responses, whereas luminance and red-green high temporal frequency modulations are equally or more effective than low temporal frequency modulations. Hence, these dorsal occipital regions respond well to rapid modulations, but not all color information is represented. Similar to human motion perception, MT+ and V3A respond powerfully to all temporal frequencies but only to some colors. Similar to human color perception, V0 responds powerfully to all colors but only to relatively low temporal frequencies.