Published online by Cambridge University Press: 01 April 2022
Most patterns of an organism develop reproducibly and predictably. Thus, most biological patterns are largely predetermined by the nature of the zygote and by the nature of the surrounding world. Some ontogenetic patterns can also be considered to be preformed. Eighteenth and nineteenth century definitions of ‘preformation’ suggested that all aspects of a precursor pattern—its elements and its configuration—are preserved during development. Today, the idea of preformed configurations has been lost. To revive this lost idea, we offer the following biologically contemporary definition for preformed ontogenetic patterns: preformed patterns are those patterns with topologies that have been conserved during their ontogenies. This definition is presented in precise mathematical language, and its application is demonstrated in a system of developing, abstract patterns.
We are indebted to Prof. Ulf Grenander, to Prof. Raymond Lasek and to the journal referee for their comments which led to significant improvements in this manuscript. This work was supported by NIH grants NS 07118 and NS 06278 and by a grant from NSF.
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