Abstract
This article attempts to clarify the commitments of a predictive coding approach to perception. After summarizing predictive coding theory, the article addresses two questions. Is a predictive coding perceptual system also a Bayesian system? Is it a Kantian system? The article shows that the answer to these questions is negative.
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Notes
In this first sketch of the theory, I treat expectations and predictions as separate elements. Depending on the specific example, however, there may be no difference between the two (see, predictive coding in lateral and temporal inibition below). In Sect. 3, following the insight of an anonymous referee, I put this distinction into question.
There is also a notion of free-energy that comes from thermodynamics. In thermodynamics, free energy stands for the measure of energy “available to do useful work” (Clark 2016 p. 17; Friston et al. 2006 p. 71). The link between information theoretic, and thermodynamic free-energy is only mathematical. Both notions appeal to the same probabilistic foundations. It is the information theoretic notion that is at play in free-energy minimization theory (Friston and Stephan 2007, p. 420).
There are other ways in which the sketch of PCP just outlined is simplified. For example, I described the visual apparatus as an isolated process while there are certainly influences from other modalities, and from action. I do not think that these simplifications perniciously affect what is argued in this article.
In some Bayesian models of perception, the selection of the percept is made in accord with expected utility maximization which involves calculating the costs and benefits associated with accepting the hypothesis with the highest posterior. In others, like the one I just described, it is made simply as a function of the posterior probability (Maloney et al. 2009, Howe et al. 2006, p. 2; Mamassian et al. 2002, p. 20–21, Mamassian and Landy 1998).
For discussion of this prior, see Stone (2011), p. 179.
A third way in which predictive coding can be given an intellectualist gloss is by intending “error” as the mismatch between how we represent the world to be and how the world is. In this interpretation, reducing this mismatch is tantamount to getting to truth. As far as I can see, this is not a mandatory reading of “error” in predictive coding. “Error”, in this context, is the discrepancy between the information already transmitted, and the information coming in, quite independently of how this information matches what is in the world. The information may concern what is useful for the system to know, rather than what is true. In other words, a system that uses predictive coding may reduce error in the sense of reducing biological disadvantage and enhancing fit. For reasons of space, I do not investigate this aspect of predictive coding any further in the present article.
An anonymous referee rightly points out that work in Bayesian perception often adds a Gaussian noise to the perceptual signal. This addition seems to be un-ecological.
Thanks to an anonymous referee for raising this point.
Thanks to an anonymous referee for raising this point.
Thanks also to Casey O’Callaghan for bringing up this point.
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This article develops themes from Orlandi 2014. I thank Jona Vance and Martin Thomson-Jones for assistance in understanding Bayesian decision theory. Needless to say, any mistake present in the paper is my own. I also thank two anonymous referees selected by Synthese, for constructive criticism on an earlier version of this article.
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Orlandi, N. Predictive perceptual systems. Synthese 195, 2367–2386 (2018). https://doi.org/10.1007/s11229-017-1373-4
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DOI: https://doi.org/10.1007/s11229-017-1373-4