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Consequences of a Functional Account of Information

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Abstract

This paper aims to establish several interconnected points. First, a particular interpretation of the mathematical definition of information, known as the causal interpretation, is supported largely by misunderstandings of the engineering context from which it was taken. A better interpretation, which makes the definition and quantification of information relative to the function of its user, is outlined. The first half of the paper is given over to introducing communication theory and its competing interpretations. The second half explores three consequences of the main thesis. First, a popular claim that the quantification of information in a signal is irrelevant for the meaning of that signal is exposed as fallacious. Second, a popular distinction between causal and semantic information is shown to be misleading, and I argue it should be replaced with a related distinction between natural and intentional signs. Finally, I argue that recent empirical work from microbiology and cognitive science drawing on resources of mathematical communication theory is best interpreted by the functional account. Overall, a functional approach is shown to be both theoretically and empirically well-supported.

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Notes

  1. For a history of approaches to information based on purposive behaviour, see Adams (2003, §3). More recent work includes Bergstrom and Rosvall (2011), which offers a user-relative definition of genetic information, and Rathkopf’s account of neural information, which defends a function-relative definition against the worry that such an approach might threaten scientific objectivity (Rathkopf 2017). See also Dennett (2017, §6) and Fresco et al. (2018). Space precludes a comparison between these works and the account discussed here, but I suspect they are all broadly compatible.

  2. For more on informational readings of classical conditioning, see Rescorla (1988) and Gallistel (2003).

  3. The ‘success semantics’ account of mental content has a similar structure (Whyte 1990).

  4. See also Mann (2018, 10–12).

  5. The irrelevance claim has been challenged by others, but it seems tough to overturn: “By the time of our Third London Symposium on Information Theory in 1955, it had become something of an accepted saying that ‘information theory has nothing to do with meaning’. The time seemed ripe to question this hardening dogma...” (MacKay 1969, 79).

  6. In the terminology of traditional philosophy of language, signs can have both kinds of ‘direction of fit’ at once (Millikan 1995).

  7. It is not immediately clear how to interpret the formalism, but here is a suggestion: while 1 bit of information allows the receiver to infer one out of two equiprobable states of the world, perhaps 1 bit of instruction allows the receiver to choose one out of two equifavourable acts.

  8. Shannon (1959, 326-7) points out that source and target sets need not be identical, nor even ‘symbols’ in the familiar sense. Lean (2016, 239-40) makes a similar point, forging a path for the adoption of informational models in other domains.

  9. A recent trend seeks to distinguish two concepts I treat as equivalent. The distinction, advocated by several authors including Price (2008, §5), Hutto and Myin (2013, 67), Rescorla (2013) (who cites Burge (2010) as inspiration) and Lean (2014), runs as follows. Simple signalling systems carry information in the guise of reliable correlation (“functional isomorphism”, “Shannon information”) – tokens that correspond to worldly states in a manner sufficient for successful behaviour. But correlational information is to be distinguished from the much richer notion of content, which is characterised by truth conditions. There is far more to say about this distinction and its motivations than can be addressed here. For a defence of the use of semantic concepts in simple signalling systems, see Millikan (2013b). For some remarks on the term “Shannon information” see below, page 11.

  10. Due to space constraints I neglect several possible positions. For example, it is possible to accept the causal interpretation of information and deny that anything further is needed for semantic information; see Skyrms (2010, §3). I also ignore Grice’s term “non-natural meaning” to prevent confusion.

  11. I omit a third category, manipulations, which are influential behaviours performed by senders to the detriment of receivers. These may display the same ‘ritualised’ qualities described for signals. The theoretical status of manipulations is still in dispute, with some arguing they should be included in the definition of signals (Owren et al. 2010). I resist that categorisation because I see coadaptation (or more broadly, codesign) as central to the mathematical and conceptual tools we use to analyse the varieties of information. On the other hand, Owren et al. (2010) see information as a deeply problematic concept that should be left out of animal communication studies altogether. See Mann (2018) for a fuller discussion.

  12. It is this difference that Millikan (2013a) leverages to analyse the correctness conditions of intentional signs in terms of their function. Natural signs, by definition, have no correctness conditions; they are neither true nor false.

  13. In particular by Rathkopf (2017), who advocates a relativist approach to neural information. Rathkopf also criticises the overly permissive notion of Shannon information as being out of step with the mathematical definition of information at work in engineering.

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Acknowledgements

Thanks to Ron Planer, two anonymous referees, and the editors for comments. Thanks also to Manolo Martínez for pointing me in the direction of rate-distortion theory. This research is supported by an Australian Government Research Training Program (RTP) Scholarship and Australian Research Council Laureate Fellowship Grant FL130100141.

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Mann, S.F. Consequences of a Functional Account of Information. Rev.Phil.Psych. 11, 669–687 (2020). https://doi.org/10.1007/s13164-018-0413-4

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