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Representation-supporting model elements

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Abstract

It is assumed that scientific models contain no superfluous model elements in scientific representation. A representational model is constructed with all the model elements serving the representational purpose. The received view has it that there are no redundant model elements which are non-representational. Contrary to this received view, I argue that there exist some non-representational model elements which are essential in scientific representation. I call them representation-supporting model elements in virtue of the fact that they play the role to support the representational role of representational model elements. Representation-supporting model elements, which have a characteristic of dependability, are not to be eliminated in the process of modeling although they are playing second fiddle to representational model elements in scientific representation.

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Notes

  1. I am aware of the non-representational scientific models such as constructive models (Tee 2018) and generative models (Fagan 2016; Peschard 2011). My focus in this paper is confined to models that play a representational role.

  2. I construe non-representationality (of a representation-supporting model element) in modeling as involving idealization/distortion of the relevant feature in the target system (e.g., the distortion of the number of effective atoms and the degrees of freedom in Levitt’s model as explained in “Representation-supporting model elements in abstract models” section below).

  3. The reason I borrow these attributes from software engineering is that the relation between a dependable software and a dependant software (i.e., a software that depends on other software for its functions) is somehow very similar to the relation between representation-supporting model elements and representational model elements. Both require the factors of availability, reliability, and recurrence in order for the dependant software and the representational model elements to function.

  4. Gelfert (2011) claims that one of the differences between mathematical expressions/formalisms and mathematical techniques is that the former is established in a global way without concerning much about the empirical details whereas the latter is applied to specific empirical contexts.

  5. See Strevens (2017) and Weisberg (2007) for a discussion on idealization.

  6. Similarly, Potochnik “argue[s] that idealizations themselves play a positive representational role” (2017, p. 50).

  7. Michael Levitt is a biophysicist and a structural biologist who has been awarded the Nobel Prize in 2013 for his contributions in the development of multi-scale models for complex chemical systems.

  8. In addition, the torsion angle α also supports the representation of the potential energy of the molecule. The derivatives of the energy are dependent on α in the equations. The dependability of the torsion angle α in supporting other representational model elements (such as the derivatives of the energy) implies that the latter are functionally dependent on the former, despite the former does not play the representational role in the representation. The representation-supporting model element (e.g., the torsion angle α) idealizes and foregrounds the relevant feature of the target system in facilitating the representational role of the representational model element (e.g., the derivatives of the energy).

  9. See Ramsey (2007) for a philosophical discussion on calibrating model elements for the model of protein folding. Besides, Robert Skipper thinks that biologists calibrate the representational model elements, not the representation-supporting model elements, when he states “laboratory models in population genetics are calibrated to parameters describing natural populations […]” (Skipper 2004, p. 370). Recently, Tal (2017) holds a similar view that model calibration is applicable only to the representational model element by adjusting it for a better fit with the target phenomenon.

  10. I do not think all material models comprise representation-supporting model elements. Only some do.

  11. The representation of the target phenomenon by a model organism may not always be straightforward. This representational relation is subject to constant reevaluation (see Huber and Keuck 2013).

  12. Hingorani et al. (2003) did not report the connection between ductal cells expansion and IL-6 primarily because IL-6 is not playing any role in representing pancreatic cancer in humans. IL-6 may involve in various physiological and pathological conditions which have nothing to do with pancreatic cancer.

  13. Manipulation of scientists plays an important role in determining whether a model element is representational or representation-supporting (nonrepresentational). Representation-supporting model elements such as IL-6 and Treg cells in my case study are nonrepresentational (in the way that they are playing the background role in foregrounding the specified aspects of the relevant feature of the target system, a role that assists/supports the representational model elements in the task of representing the disease) because the modelers do not aim to use them for representation—they do not manipulate them for the purpose of representation. However, IL-6 and Treg cells still participate in the representation of the disease in an indirect way via indirect molecular pathways that are running in the background of disease formation. The indirect involvement of IL-6 and Treg cells in the representation (by providing representational support) is inevitable because they are located in the relevant background molecular pathway leading to the disease. Notably, the activities of IL-6 and Treg cells are different in the mouse and the human patients—scientists manipulate the relevant molecular pathway to which IL-6 and Treg belong in order to create pancreatic cancer in an artificial way in the mouse model. Although there is similarity between the mouse pancreatic cancer and the human pancreatic cancer, the activities of IL-6 and Treg cells in the mouse are not similar to their counterparts in human patients. The pancreatic cancer in human is not formed by recruiting the IL-6 and Treg cells in the same ways as that of the manipulation of the mouse's molecular pathway to which IL-6 and Treg cells belong. I do not deny the possibility that the role of a representation-supporting model element and the role of a representational model element can be interchanged for a particular model element in the situation where the modeler changes his or her object of manipulation. This can be seen in many modeling tasks where the modelers intentionally manipulate IL-6 and Treg cells (as opposed to my case study) in their modeling activities, with adjustment of their position in the relevant molecular pathway by silencing or inhibiting specified model elements. Such an adjustment brings IL-6 and Treg cells from the upstream position to the downstream position in the cancer-linked molecular pathway. The presence of these model elements at the downstream position has a causative effect on cancer formation, rather than an indirect effect in supporting cancer formation. In those cases, IL-6 and Treg cells will be no longer a representation-supporting model element but a representational model element.

  14. Although I have argued above (see footnote 13) that manipulation of scientists plays an important role in determining whether a model element is representational or representation-supporting (nonrepresentational), the presence of a model element at the location of a molecular pathway (i.e., upstream or downstream) may also determine whether it is a representational or representation-supporting model element. IL-6 and Treg cells as nonrepresentational model elements are representation-supporting because they are depended by other representational model elements (such as the relevant cells and cytokines which play the representational role) in representing human cancer. This dependability is manifested in the molecular pathway (which is causal in nature) in which both IL-6/Treg cells and the representational model elements are taking part. Because IL-6 and Treg cells take part at the upstream of the relevant molecular pathway which is leading to cancer formation, their presence in this molecular pathway of cancer formation is vital for the recruitment of the downstream cells and cytokines which are the direct causative factors that lead to cancer formation. The presence of the downstream cells and cytokines is regarded as the biomarkers of cancer formation, therefore these model components are representational. IL-6 and Treg cells, which are at the upstream of the molecular pathway, are not regarded as the biomarkers that may be used to indicate the formation of cancer. Their presence does not represent cancer formation (because they are also prevalent in other normal physiological pathways which are not leading to cancer formation) but is important to engage in the recruitment of the downstream cells and cytokines—the recruitment of which may lead to cancer formation. Such an engagement in recruiting the downstream model elements is a representation-supporting role.

  15. I thank an anonymous reviewer for constructive comments.

  16. The mere fact that both IL-6 and Treg cells are present in mice and humans does not mean that mouse IL-6 and Treg cells could represent their counterparts in humans. The reason is that IL6/Treg cells in the mouse behave differently in the formation of cancer as compared to the activities of IL6/Treg in human cancer. The fact that an element can be found in both a model and a target does not imply that that model element is representational or similar to the element in the target. In order for a model element to be representational, it must behave in the same way as its target element does. We cannot say that a model element is representational if its activities are different from that of the target element. To illustrate, we cannot say that mouse neurons represent (i.e., similar to) the human neurons if they are manipulated in such a way that their activities are no longer similar to that of the human neurons. Similarity must be preserved in a representational relationship between model elements and target elements; similarity must also be established within a context (e.g., general contexts such as pathological, physiological, etc.; specific contexts such as pancreatic cancer, lung cancer, etc.), as Nelson Goodman holds that anything is similar to anything else in some respects.

  17. Cf. Piotrowska (2013), who argues that the mechanistic approach to generalization from model organisms to target species has its limit.

  18. I have argued in this paper that idealization could play a representation-supporting role in scientific representation. However, some philosophers have argued that idealization could facilitate explanation by playing a representational role (e.g., Bokulich 2012; Winsberg 2010), while others claim that idealization is nonrepresentational and functions to remove the irrelevant details of the target system (See my discussion in “Representation-supporting model elements in abstract models” section). The difference between my stance and the nonrepresentational view of the latter group is that I do not think that idealization can only play the role of removing the irrelevant details; rather, I claim that idealization which plays the representation-supporting role in scientific representation may foreground the relevant features of the target system by distorting them. It is interesting to discuss further, in a future paper, the interplay between these different types of idealized model elements in different types of scientific representation.

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Tee, SH. Representation-supporting model elements. Biol Philos 35, 25 (2020). https://doi.org/10.1007/s10539-020-9743-6

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