Abstract
The article analyzes the notions of analogue and digital simulation as found in scientific and philosophical literature. The purpose is to distinguish computer simulations from laboratory experimentation on several grounds, including ontological, epistemological, pragmatic/intentional, and methodological. To this end, it argues that analogue simulations are best understood as part of the laboratory instrumentarium, whereas digital simulations are computational methods for solving a simulation model. The article ends by showing how the analogue-digital distinction is at the heart of contemporary debates on the epistemological and methodological power of computer simulations.
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Notes
- 1.
Andreas Kaminski pointed out that the notion of abstraction is present in laboratory practice as well as in scientific modeling and theorizing. In this respect, it should not be understood that laboratory practice excludes instances of abstraction, but rather that they are more material—in the straightforward sense of manipulating material products—than computer simulations. I will discuss these ideas in more detail in Sect. 3.
- 2.
Let us note that it is not enough to distinguish analogue simulations from digital simulations by saying that the latter, and not the former, are models implemented on the computer. Although correct in itself, this distinction does not provide any useful insight into the characteristics of analogue simulations nor reasons for distinguising them from computer simulations. Grasping this insight is essential for understanding the epistemological, methodological, and pragmatic value of each kind of simulation.
- 3.
I am significantly simplifying Goodman’s ideas on analogue and digital. A further distinction is that differentiated systems could be non-dense, and therefore analogue and not digital. For examples on these cases, see Lewis (1971).
- 4.
Pylyshyn is neither interested in belaboring the notions of analogue and computational process, nor in asserting grounds for a distinction. Rather, he is interested in showing that concrete features of some systems (e.g., biological, technological, etc.) are more appropriately described at the symbolic level, whereas other features are best served by the vocabulary of physics.
- 5.
The idea of ‘parallel causal-structures isomorphic to the phenomenon’ is rather difficult to pin down. For a closer look, please refer to Trenholme (1994, p. 118). I take it as a way to describe two systems sharing the same causal relations. I base my interpretation on the author’s comment in the appendix: “The simulated system causally affects the simulating system through sensory input thereby initiating a simulation run whose causal structure parallels that of the run being undergone by the simulated system” (Ibid., 128). Also, the introduction of ‘isomorphism’ as the relation of representation can be quite problematic. On this last point, see, for instance, Suárez (2003).
- 6.
Unfortunately, Trenholme does not give more details on the notion of ‘intentional concepts.’ Now, given that this term belongs to the terminological canon of cognitive sciences, and given that Trenholme is following Pylyshyn in these respects, it seems appropriate to suggest that a definition could be found in Pylyshyn’s work. In this respect, Pylyshyn talks about several concepts that could be related, such as intentional terms (Pylyshyn 1989, p. 5), intentional explanation (Ibid., 212), intentional objects (Ibid., 262), and intentional descriptions (Ibid., 20).
- 7.
Trenholme uses the notions of symbolic process and symbolic computation interchangeably (Trenholme 1994, p. 118).
- 8.
Let us note that these working conceptualizations mirror many of the definitions already found in the specialized literature (for instance, Winsberg 2015). In here, I am only interested in the analogue-digital distinction as means for grounding philosophical studies on computer simulations and laboratory experimentation.
- 9.
- 10.
In that article, I urged for a change in the evaluation of the epistemological and methodological assessment of computer simulations. For my position on the issue, see Durán (2013b).
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Acknowledgments
Thanks go to Andreas Kaminski for comments on a previous version of the article.
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Durán, J.M. (2017). Varieties of Simulations: From the Analogue to the Digital. In: Resch, M., Kaminski, A., Gehring, P. (eds) The Science and Art of Simulation I . Springer, Cham. https://doi.org/10.1007/978-3-319-55762-5_12
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