Systems Matching and Topographic Maps: The Branch-Arrow Model (BAM)

This paper presents BAM (the Branch-Arrow Model), a new model of the development of the retino-tectal topographic mapping to test the limits of system-matching principles in forming such maps. The updating process employed by BAM is distributed in nature and depends upon interactions between branches of retinal fibres, and between the branches and the boundaries of the tectum and of grafts. Results of computer simulation of the model are related to experimental data obtained from tectal and retinal graft and lesion studies and comparisons are also made with other models. Although the model accords well with most of the data, we shall present evidence that indicates the need for an additional mechanism, interaction between the branches and the tectal surface. A model of this kind, the Extended Branch Arrow Model (XBAM), will be described in a sequel.

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