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Thought Experiments in Biology

Schlaepfer, Guillaume and Weber, Marcel (2018) Thought Experiments in Biology. [Preprint]

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Unlike in physics, the category of thought experiment is not very common in biology. At least there are no classic examples that are as important and as well-known as the
most famous thought experiments in physics, such as Galileo’s, Maxwell’s or Einstein’s. The reasons for this are far from obvious; maybe it has to do with the fact
that modern biology for the most part sees itself as a thoroughly empirical discipline that engages either in real natural history or in experimenting on real organisms rather
than fictive ones. While theoretical biology does exist and is recognized as part of biology, its role within biology appears to be more marginal than the role of theoretical
physics within physics. It could be that this marginality of theory also affects thought experiments as sources of theoretical knowledge.
Of course, none of this provides a sufficient reason for thinking that thought experiments are really unimportant in biology. It is quite possible that the common
perception of this matter is wrong and that there are important theoretical considerations in biology, past or present, that deserve the title of thought experiment just as much as the standard examples from physics. Some such considerations may even be widely known and considered to be important, but were not recognized as thought experiments. In fact, as we shall see, there are reasons for thinking that what is arguably the single most important biological work ever, Charles Darwin’s On the Origin of Species, contains a number of thought experiments. There are also more recent examples both in
evolutionary and non-evolutionary biology, as we will show.
Part of the problem in identifying positive examples in the history of biology is the lack of agreement as to what exactly a thought experiment is. Even worse, there may
not be more than a family resemblance that unifies this epistemic category. We take it that classical thought experiments show the following characteristics: (1) They serve directly or indirectly in the non-empirical epistemic evaluation of theoretical propositions, explanations or hypotheses. (2) Thought experiments somehow appeal to
the imagination (so a purely mechanical deduction or calculation from theoretical
principles would not count as a thought experiment). (3) They involve hypothetical scenarios, which may or may not be fictive. In other words, thought experiments
suppose that certain states of affairs hold (irrespectively of whether they obtain in the actual world or not) and then try to intuit what would happen in a world where these suppositions are true. We want to examine in the following sections if there are episodes in the history of
biology that satisfy these criteria. As we will show, there are a few episodes that might
satisfy all three of these criteria, and many more if the imagination criterion (2) is dropped or understood in a lose sense. In any case, this criterion is somewhat vague in
the first place, unless a specific account of the imagination is presupposed. There will also be issues as to what exactly “non-empirical” means. In general, for the sake of discussion we propose to understand the term “thought experiment” here in a broad rather than a narrow sense here. We would rather be guilty of having too wide a
conception of thought experiment than of missing a whole range of really interesting examples.

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Item Type: Preprint
Keywords: Thought experiments, evolutionary biology, Darwin, population genetics, R.A. Fisher, molecular biology, F.H.C. Crick, protein synthesis, protein folding, Levinthal paradox, artificial life
Subjects: Specific Sciences > Biology
Specific Sciences > Biology > Evolutionary Theory
Specific Sciences > Biology > Molecular Biology/Genetics
General Issues > Thought Experiments
Depositing User: Prof. Marcel Weber
Date Deposited: 21 Sep 2017 18:51
Last Modified: 21 Sep 2017 18:51
Item ID: 13451
Subjects: Specific Sciences > Biology
Specific Sciences > Biology > Evolutionary Theory
Specific Sciences > Biology > Molecular Biology/Genetics
General Issues > Thought Experiments
Date: 2018

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