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Computers as Interactive Machines: Can We Build an Explanatory Abstraction?

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Abstract

In this paper, we address the question of what current computers are from the point of view of human-computer interaction. In the early days of computing, the Turing machine (TM) has been the cornerstone of the understanding of computers. The TM defines what can be computed and how computation can be carried out. However, in the last decades, computers have evolved and increasingly become interactive systems, reacting in real-time to external events in an ongoing loop. We argue that the TM does not provide a mechanistic explanation for interactive computing. The reason is that the fundamental phenomena relevant to interactive computing are out of the scope of classical computability theory. Part of the explanatory power of the TM relies on what we propose to call an execution model. An execution model belongs to a level of abstraction where it is possible to describe both the functional architecture and the execution in mechanistic terms. An updated execution model is warranted to provide the minimal mechanistic description for interactive computation as a counterpart of what the TM could explain regarding Church-Turing computation. It would support an explanation of the ubiquitous computing devices we know - those interacting with humans, e.g., through digital interfaces. We show that such a model is not available within interactive models of computation and that relevant abstractions and concerns are available in computer engineering but need to be identified and gathered. To fill this void, we propose to reflect on the level of abstraction required to support the mechanistic description of an interactive execution and propose some preliminary requirements.

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Notes

  1. Steve Russell, a student of McCarthy, showed in 1958 that the eval function of Lisp could serve as a concrete abstract machine and be directly implemented: “But in late 1958, Steve Russell, one of McCarthy’s grad students, looked at this definition of eval and realized that if he translated it into machine language, the result would be a Lisp interpreter. This was a big surprise at the time. Here is what McCarthy said about it later: Steve Russell said, look, why don’t I program this eval, and I said to him, ho, ho, you’re confusing theory with practice, this eval is intended for reading, not for computing. But he went ahead and did it. That is, he compiled the eval in my paper into [IBM] 704 machine code, fixing bugs, and then advertised this as a Lisp interpreter, which it certainly was. So at that point Lisp had essentially the form that it has today.”(Graham, 2004) p. 185.

  2. A Universal Turing Machine is a special Turing Machine that can simulate any other Turing Machine, hence its name.

  3. See, e.g., Soare’s work (Soare, 2009, 2013).

  4. In addition to that definition, a further distinction is introduced in the reactive programming community: reactive systems are sometimes distinguished from interactive systems (Harel & Pnueli, 1985; Mandel & Pouzet, 2005) A distinction is made around the real-time dimension of these systems. An interactive system reacts to events in the environment without time constraints, whereas reactive systems react within a time limit set by the environment. For example, the kernel of a general-purpose operating system (OS) is interactive (its response time to events depends on its load and hardware capabilities). In contrast, the autopilot of an aircraft is a reactive system (its response time to events is specified and must be respected). When we talk about interaction from the perspective of HCI, we refer to “interactive system” following that distinction.

  5. Marr’s work on visual perception, e.g., presented in his book, Vision: A Computational Approach has been influential in analyzing complex information processing systems. See McClamrock’s paper (McClamrock, 1990) for a synthesis of Marr’s framework and criticisms.

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Acknowledgements

We are very grateful to our anonymous reviewers for their objections and comments.

Funding

This work was partly supported by the French “Programme d’Investissements d’avenir” ANR-17-EURE-0005 conducted by ANR and by Agence de l’Innovation de Défense (AID).

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Correspondence to Alice Martin.

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Martin, A., Magnaudet, M. & Conversy, S. Computers as Interactive Machines: Can We Build an Explanatory Abstraction?. Minds & Machines 33, 83–112 (2023). https://doi.org/10.1007/s11023-023-09624-2

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