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Theory is as Theory Does: Scientific Practice and Theory Structure in Biology

  • Thematic Issue Article: The Meaning of “Theory” in Biology
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An Erratum to this article was published on 17 August 2012

Abstract

Using the context of controversies surrounding evolutionary developmental biology (EvoDevo) and the possibility of an Extended Evolutionary Synthesis, I provide an account of theory structure as idealized theory presentations that are always incomplete (partial) and shaped by their conceptual content (material rather than formal organization). These two characteristics are salient because the goals that organize and regulate scientific practice, including the activity of using a theory, are heterogeneous. This means that the same theory can be structured differently, in part because theory presentations (as idealizations) intentionally depart from different features known to be present in a theory. Since there are diverse and potentially incompatible theory structures derived from heterogeneous goals found in scientific practices, a question arises about the absence of a unifying theory structure in the background. The notion of a “theory façade” offers a fruitful perspective on this potentially unsettling result.

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Notes

  1. http://www.utwente.nl/gw/spsp/about/SPSP_purpose_051202.doc/.

  2. http://www.utwente.nl/gw/spsp/about/SPSP_purpose_051202.doc/.

  3. Explanatory goals are understood here as a subset of epistemological goals, the latter of which also includes aims such as classification, systematization, and conceptual clarification.

  4. Some other epistemic unit, such as a perspective, might achieve this coordination of models and phenomena or data models (see, e.g., Griesemer 2000).

  5. This is not to say that the semantic view of theories is wrong. Rather, there are features of theory structure that remain unaddressed in the traditional debate. A useful way to see the difference is via a distinction between informational and functional theories of scientific representation (Chakravartty 2010). The former utilize relations of similarity or isomorphism to capture representation, and the traditional theory structure debate fits here. Functional theories utilize cognitive activities (e.g., inference) that are enabled by representative devices (e.g., models). These two types of theories of scientific representation are complementary, rather than competing. My emphasis on scientific practice places me on the functional side of the divide with respect to theory structure.

  6. In rare cases, this framework is embedded in a more general conceptual structure for biological science (Scheiner 2010), albeit controversially.

  7. This notion of a core has also been assumed by philosophers: “[Philosophers] seem to agree on one thing: if you can characterize formal population genetics, then you have characterized the ‘guts’ or ‘core’ of evolutionary theory” (Lloyd 1988, p. 8).

  8. “A formalisation of a theory is an abstract representation of the theory expressed in a formal deductive framework for which there is a complete specification of: (1) what constitutes a well-formed-formula, and (2) all the permissible rules of inference.…it is important to emphasize one crucial similarity between the syntactic and semantic conceptions, …they are both conceptions of the formal structure of theories” (Thompson 2007, pp. 485, 500).

  9. “We cannot understand variation and adaptation unless we understand the cellular details…[this] may seem messy and non-mathematical, but the most general truths in science (including evolution) emerged in these qualitative ways. Messy fields full of details, like chemistry, geology, and medicine, have managed to derive powerful theoretical understandings of complex phenomena….In some cases, this was followed by mathematical codification and in other cases not” (Kirschner 2012).

  10. Note that this invocation of “mechanism” is distinct from mechanistic models found in experimental biology, such as CREs. The qualification (“mechanism for the evolution of form”) is shorthand for the combination of different principles, each of which is not best considered as a mechanistic model (e.g., heterotopy).

  11. The contested axis of form (structure/morphology) versus function (adaptation/physiology) has been with us a long time (Russell 1916/1982). These thematic emphases in biological reasoning coalesce around distinct explanatory goals and therefore structure evolutionary theory differently (Love 2011). This helps to explain ongoing difficulties in synthesizing disciplinary approaches in biology (Laubichler and Maienschein 2009).

  12. This includes disagreements about the reach of Carroll’s genetic theory of morphological evolution. For example: “[Understanding morphological evolution] necessarily includes many more factors than the evolution of gene regulation alone, notably the dynamics of epigenetic interactions, the chemicophysical properties of growing cell and tissue masses, and the influences of environmental parameters” (Müller 2007, p. 944).

  13. For example, and controversially, if “causal-mechanistic” explanation is superior to explanations citing different forces operating on populations (“population-level explanation”), then evolutionary theory must be restructured so that these developmental considerations take a more central or foundational position (Laubichler 2010).

  14. The degree to which debates over centrality are misguided depends on how the differing methodological and epistemological goals are perceived. If these are taken as legitimate, then there is a pseudo-conflict. If some set of goals is deemed illegitimate, then the debates are substantive (though centrality is not their animating impulse). My argument only depends on the possibility of the former interpretation. Carroll and Lynch may be questioning the legitimacy of differing methodological and epistemological goals. If so, standards for goals may need to be compared and reconciled harbors its own set of difficulties.

  15. Could the goal be to generate a unitary evolutionary theory? As noted, this stated aim often travels with other associated methodological commitments, such as mathematical formalization (e.g., Rice 2004; cf. Thompson 2007), which lead to eliminating standard elements of evolutionary biology (Love 2010). Thus, this epistemological goal is better described as finding an MIS that is as general as possible under particular methodological constraints.

  16. Another way this is expressed is as a “foundation”: “Theories would ideally support a large number of different models and frame a broad range of nominally different modeling contexts” (Krakauer et al. 2011, p. 271).

  17. Although it cannot be pursued here, another way to flesh out this analysis is that theories are organizationally complex just like organisms, and therefore admit of different (incompatible) decompositions into parts or multiple heuristic perspectives (Wimsatt 2007, Chap. 9). The analogue to the difficulty of identifying a unified evolutionary theory behind the MIS patchwork is the difficulty of identifying what counts as an individual.

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Acknowledgments

I am grateful to Werner Callebaut, Massimo Pigliucci, and Kim Sterelny for the invitation to participate in “The Meaning of ‘Theory’ in Biology” workshop at the Konrad Lorenz Institute for Evolution and Cognition Research (July 2011), where an early version of this material was presented. I benefited enormously from the feedback of the workshop participants, especially detailed comments on a draft of the manuscript from Massimo Pigliucci and Kim Sterelny. Many of their incisive comments helped improve the arguments although this does not imply their endorsement (not least because many of their cogent objections have not been fully addressed). I also am grateful to Jim Griesemer and Lisa Lloyd who provided me with critical feedback on a different version of this material.

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Love, A.C. Theory is as Theory Does: Scientific Practice and Theory Structure in Biology. Biol Theory 7, 325–337 (2013). https://doi.org/10.1007/s13752-012-0046-2

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