Abstract
Computational complexity has been developed under the assumption that thinking can be modelled by a Turing machine. This view of cognition has more recently been complemented with situated and embodied cognition where the key idea is that cognition consists of an interaction between the brain, the body and the surrounding world. This chapter deals with the meaning of complexity from a situated and embodied perspective. The main claim is that if the structure of the world is taken into account in problem solving, the complexity of certain problems will be reduced in relation to Turing machine complexity. For example, search algorithms can be simplified if the visual structure of the world is exploited. Another case is the logical problem of language acquisition, claiming that children cannot learn language simply by considering the input. It is argued that this problem will not arise if it is taken into account that children’s learning of grammatical features often exploits world knowledge.
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Notes
- 1.
For example, it is surprising that Marr [22] did not at all mention computational complexity in his description of the three levels of computation.
- 2.
There are attempts, however, in the work on adaptive Turing machines.
- 3.
This assumption is the basis for all sci-fi novels about a brain in the vat.
- 4.
- 5.
In the terminology of Barwise and Shimojima’s [1] “surrogate reasoning”, this example is a “free ride” provided by the geometric constraints. However, the authors do not consider the reduction in complexity provided by “free rides”.
- 6.
- 7.
Chomsky’s early work concerned the relations between different kinds of formal automata and the (formal) languages they could identify. This is a typical problem of computationalism that builds on Assumptions (1) and (2). Chomsky seems, more or less, to have stuck to these assumptions throughout his career.
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Acknowledgments
I gratefully acknowledge support from the Swedish Research Council for the Linnaeus environment Thinking in Time: Cognition, Communication and Learning. Thanks to Holger Andreas, Johan van Benthem, Alistair Isaac, Giovanni Pezzulo and Jakub Szymanik for helpful comments on an earlier version of the paper.
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Gärdenfors, P. (2014). Computational Complexity and Cognitive Science: How the Body and the World Help the Mind be Efficient. In: Baltag, A., Smets, S. (eds) Johan van Benthem on Logic and Information Dynamics. Outstanding Contributions to Logic, vol 5. Springer, Cham. https://doi.org/10.1007/978-3-319-06025-5_31
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