Marco Buzzoni

On the relation between experiment and thought experiment in the natural sciences. To understand the reciprocal autonomy and complementarity of thought and real experiment, it is necessary to distinguish between a ‘positive’ (empirical or formal) and a transcendental perspective. Empirically and formally, real and thought experiments are indistinguishable. However, from a reflexive-transcendental viewpoint thought experiment is at the same time irreducible and complementary to real experiment. This is due to the fact that the hypothetical-anticipatory moment is in principle irreducible to physical reality—even though it refers to physical reality and is bound with the empirical use of our understanding. The presence of counterfactuals is the condition of the possibility for thought experiments to become in principle real ones, by means of a series of technical realisations that gradually approximate the idealisations that they contain.

All the most important epistemological and ontological theses of Kuhn's theory of science depend to a decisive extent on corresponding ideas of Wittgenstein's theory of meaning. The semantic and ontological assumptions that determine the main trend of Kuhn's epistemology consist, respectively, of a theory of meaning as use or application of empirical terms to nature and an ontology that conceives the real as a continuous essentially amorphous and undifferentiated, in which only language and its rules can insert order and regularity, In Kuhn's theory of science, however, beside this main trend of thought, there is another one, by far secondary, which moves towards a realistic conception of scientific theories, although it usually stops halfway, assuming the aspect of an unsustainable and unoriginal indirect realism. After highlighting the oscillations and internal difficulties not only of Kuhn's epistemology and methodology, but also of the Wittgensteinian theory of meaning, the final part of the volume outlines a realistic conception of scientific knowledge that takes as its foundation the intrinsically cognitive nature of instrumental operations and tries to provide a satisfactory response to Kuhn's challenge and, in particular, to his thesis of incommensurability. From this point of view, the use and reference of scientific terms or theories are constitutive and inseparable moments of their meaning, and refer to an internally structured relational reality.

The operational perspective here defended permits a reflexive-transcendental point of view that sharply distinguishes the two concepts, while, at the same time, maintaining the connection between them. On the one hand, simply imagining that the experimental apparatus, counterfactually anticipated in a thought experiment, has really been constructed is sufficient to erase any difference between thought and real experiments. On the other hand, this very ‘imagining’, this capacity of the mind to assume every real entity as a possible entity, underpins the difference in principle – a properly transcendental difference – between thought and real experiments. This difference, however, implies the intimate association between experiment and thought experiment: All thought experiments must be thought of as translatable into real ones, and all real experiments as realisations of thought ones. What thought experiments have over and above real experiments is the mere fact that they exist in a purely hypothetical sphere; what real have over and above thought experiments is the mere fact that they overstep the sphere of the possible, in the experiment’s real execution.

Thought experiments de facto play many different roles in biology: economical, ethical, technical and so forth. This paper, however, is interested in whether there are any distinctive features of biological TEs as such. The question may be settled in the affirmative because TEs in biology have a function that is intimately connected with the epistemological and methodological status of biology. Peculiar to TEs in biology is the fact that the reflexive, typically human concept of finality may be profitably employed to discover mechanical-experimental causal relations in all living beings—with the obvious caveat that we do not hypostatise and interpret this concept as an ontological quality, since this would land one in an implicitly animistic, pre-Galilean view of nature. From a methodical point of view, the concept of finality is an essential assumption as well as a powerful heuristic tool in the practice of biology, that is, in the investigation of living beings in an intersubjectively testable and reproducible way.

Hermeneutic and anti-hermeneutic sides in the debate about psychoanalysis are entangled in an epistemological and methodological antinomy, here exemplified by Grünbaum's and Spence's paradigmatic views. Both contain a partial element of truth, which they assert dialectically one against the other (§§ 1 and 2). This antinomy disappears only by reconciling an operationalist approach with man's ability to suspend the effectiveness of the‘laws’ applied to him (§ 3). The hermeneutic way in which the technical-operational criterion of truth works in psychoanalysis demands that clinical and extra-clinical testing methods work synergically, through a fruitful self-correcting strategy, grounded on the very psychoanalytic object: the unconscious (§ 4).