Inferior Temporal Neurons Show Greater Sensitivity to Nonaccidental than to Metric Shape Differences
Inferior Temporal Neurons Show Greater Sensitivity to Nonaccidental than to Metric Shape Differences
复制标题
下颞神经元对非偶然的形状差异比对公制形状的差异更敏感
DOI：
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发表时间：
2001
影响因子：
3.2
通讯作者：
A. Lorincz
中科院分区：
文献类型：
--
作者：
R. Vogels;I. Biederman;M. Bar;A. Lorincz
人们早就知道，猕猴下颞（IT）神经元倾向于更强烈地激发某些形状比其他形状，不同的IT神经元可以显示出显着不同的形状偏好。除了发现这些偏好可以由中等复杂性的特征引起之外，还没有出现（非面部）物体识别的一般原则，可以理解这种巨大的选择性差异。心理物理学以及计算工作表明，这样的原则之一是视点不变，非偶然（NAP）和视图相关，度量形状属性（MP）之间的差异。我们测量了单个IT神经元对不同对象的反应，这些对象在NAP（即，geon的变化）或单个部分的MP中不同，在两个方向上显示深度。细胞对NAP的变化比MP更敏感，即使前者产生的图像变化（通过小波测量评估）小于后者。从旋转本身的响应调制的幅度是，平均而言，类似于由NAP差异产生的，虽然从旋转的图像变化比NAP差异产生的要大得多。多维尺度的神经反应表示NAP/MP维度，独立的方向维度。因此，目前的结果表明，IT细胞的神经代码的一个重要部分代表的差异，而不是MP的NAP。该代码可以使得能够在新视图处立即识别新对象。
It has long been known that macaque inferior temporal (IT) neurons tend to fire more strongly to some shapes than to others, and that different IT neurons can show markedly different shape preferences. Beyond the discovery that these preferences can be elicited by features of moderate complexity, no general principle of (nonface) object recognition had emerged by which this enormous variation in selectivity could be understood. Psychophysical, as well as computational work, suggests that one such principle is the difference between viewpoint-invariant, nonaccidental (NAP) and view-dependent, metric shape properties (MPs). We measured the responses of single IT neurons to objects differing in either a NAP (namely, a change in a geon) or an MP of a single part, shown at two orientations in depth. The cells were more sensitive to changes in NAPs than in MPs, even though the image variation (as assessed by wavelet-like measures) produced by the former were smaller than the latter. The magnitude of the response modulation from the rotation itself was, on average, similar to that produced by the NAP differences, although the image changes from the rotation were much greater than that produced by NAP differences. Multidimensional scaling of the neural responses indicated a NAP/MP dimension, independent of an orientation dimension. The present results thus demonstrate that a significant portion of the neural code of IT cells represents differences in NAPs rather than MPs. This code may enable immediate recognition of novel objects at new views.
影响因子：
3.7
作者：
LOGOTHETIS, NK;PAULS, J
通讯作者：
PAULS, J