Quantitative characterization of disparity tuning in ventral pathway area V4.
Quantitative characterization of disparity tuning in ventral pathway area V4.
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DOI：
10.1152/jn.00341.2005
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发表时间：
2005-10
影响因子：
2.5
通讯作者：
D. Hinkle;C. Connor
中科院分区：
文献类型：
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作者：
D. Hinkle;C. Connor
我们进行了定量表征的猕猴视觉皮层的腹侧（对象处理）通路中的双眼视功能调谐功能。我们测量了452个V4区神经元对差异范围为-1.0到+1.0度的刺激的反应。非对称高斯函数最适合原始数据（中值R = 0.90），捕获调谐模式的模态分量（-1.0至+1.0度范围内的局部峰值）和单调分量（对视差的线性或S形依赖性）。来自非对称高斯拟合的值用于表征模态x单调调谐域上的神经元。沿着模态调谐轴的点对应于经典调谐的兴奋和抑制模式;沿着沿着单调轴的点对应于经典的近和远模式。这个域上的分布是连续的，大多数神经元表现出混合模态/单调调谐模式。在模态维度的分布向兴奋模式，与以前的结果在其他领域一致。单调维度中的分布被转移到针对交叉视差的调谐（对应于比注视平面更近的刺激）。这可能反映了对更接近观察者的对象或对象部分的感知重点。我们还发现，颜色调节强度与方向调节强度和颜色调节强度呈正相关，与感受野偏心率呈负相关。
We performed a quantitative characterization of binocular disparity-tuning functions in the ventral (object-processing) pathway of the macaque visual cortex. We measured responses of 452 area V4 neurons to stimuli with disparities ranging from -1.0 to +1.0 degrees. Asymmetric Gaussian functions fit the raw data best (median R = 0.90), capturing both the modal components (local peaks in the -1.0 to +1.0 degrees range) and the monotonic components (linear or sigmoidal dependency on disparity) of the tuning patterns. Values derived from the asymmetric Gaussian fits were used to characterize neurons on a modal x monotonic tuning domain. Points along the modal tuning axis correspond to classic tuned excitatory and inhibitory patterns; points along the monotonic axis correspond to classic near and far patterns. The distribution on this domain was continuous, with the majority of neurons exhibiting a mixed modal/monotonic tuning pattern. The distribution in the modal dimension was shifted toward excitatory patterns, consistent with previous results in other areas. The distribution in the monotonic dimension was shifted toward tuning for crossed disparities (corresponding to stimuli nearer than the fixation plane). This could reflect a perceptual emphasis on objects or object parts closer to the observer. We also found that disparity-tuning strength was positively correlated with orientation-tuning strength and color-tuning strength, and negatively correlated with receptive field eccentricity.