Beyond componential constitution in the brain : starburst amacrine cells and enabling constraints
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Abstract
Componential mechanism (Craver 2008) is an increasingly influential framework for understanding the norms of good explanation in neuroscience and beyond. Componential mechanism “construes explanation as a matter of decomposing systems into their parts and showing how those parts are organized together in such a way as to exhibit the explanandum phenomenon” (Craver 2008, p. 109). Although this clearly describes some instances of successful explanation, I argue here that as currently formulated the framework is too narrow to capture the full range of good mechanistic explanations in the neurosciences. The centerpiece of this essay is a case study of Starburst Amacrine Cells —a type of motion-sensitive cell in mammalian retina —for which function emerges from structure in a way that appears to violate the conditions specified by componential mechanism as currently conceived. I argue that the case of Starburst Amacrine Cells should move us to replace the notion of mechanistic componential constitution with a more general notion of enabling constraint. Introducing enabling constraints as a conceptual tool will allow us to capture and appropriately characterize a wider class of structure-function relationships in the brain and elsewhere.
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Open MIND, Metzinger, Thomas, MIND Group, Frankfurt am Main, 2015, https://doi.org/10.15502/9783958570429