Neural image transformation in the somatosensory system of the monkey: comparison of neurophysiological observations with responses in a neural network model.
Neural image transformation in the somatosensory system of the monkey: comparison of neurophysiological observations with responses in a neural network model.
复制标题
猴子体感系统中的神经图像转换：神经生理学观察结果与神经网络模型中的响应的比较。
DOI：
10.1101/sqb.1990.055.01.058
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Johnson,KO
中科院分区：
文献类型：
--
作者：
Bankman,IN;Hsiao,SS;Johnson,KO
Although the mechanisms of perception are not understood, it seems that there must be a continuous process of matching between incoming neural images and images stored in memory and that this is done in a time frame that amounts to a small number of neuronal input/output cycles. In both the visual and somatosensory systems, the topographic organization of receptors laid out across the retina and the skin dictates that the first neural representation of externally imposed geometric form and the corresponding stimulus are isomorphic. However, pattern matching based on isomorphic images is prohibitively time consuming; identification requires matching between the unknown image and every possible template at every possible location, size, and orientation. The images being matched by the higher mechanisms underlying perception must be in some other form. A primary task of the sensory systems must be to transform neural images from their initial isomorphic form to the form that underlies perception, recognition, and association. The somatosensory system, like other sensory systems, is a large neural network that effects this overall transformation through a series of operations at successive synaptic relay zones. Understanding this transformational process will ultimately require explicit models that can be tested against experimental data. We present one such model in this paper.The study reported here is part of a larger study of the neural mechanisms underlying tactile pattern recognition. The experimental design is the one pioneered by Mountcastle (Talbot et al. 1968) in which a form of sensory behavior is first studied using psychophysical methods and then followed by neurophysiological studies using exactly the same stimulus conditions. Studies using this experimental design have traditionally been described as neural coding studies. This design addresses the question: What is it in the complex array of neural activity evoked by a stimulus that conveys the information on which behavior is based? The characterization of these studies as" neural coding studies" emphasizes the fact that the brain is an information processor and that information processing in the brain needs to be studied directly. The question that we
