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Perception and action without 3D coordinate frames

Glennerster, A and Stazicker, J (2017) Perception and action without 3D coordinate frames. [Preprint]

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Neuroscientists commonly assume that the brain generates representations of a scene in various non-retinotopic 3D coordinate frames, for example in 'egocentric' and 'allocentric' frames. Although neurons in early visual cortex might be described as representing a scene in an eye-centred frame, using 2 dimensions of visual direction and one of binocular disparity, there is no convincing evidence of similarly organized cortical areas using non-retinotopic 3D coordinate frames nor of any systematic transfer of information from one frame to another. We propose that perception and action in a 3D world could be achieved without generating ego- or allocentric 3D coordinate frames. Instead, we suggest that the fundamental operation the brain carries out is to compare a long state vector with a matrix of weights (essentially, a long look-up table) to choose an output (often, but not necessarily, a motor output). The processes involved in perception of a 3D scene and action within it depend, we suggest, on successive iterations of this basic operation. Advantages of this proposal include the fact that it relies on computationally well-defined operations corresponding to well-established neural processes. Also, we argue that from a philosophical perspective it is at least as plausible as theories postulating 3D coordinate frames. Finally, we suggest a variety of experiments that would falsify our claim.

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Item Type: Preprint
Keywords: 3D representation; coordinate frames; moving observer; stereopsis; motion parallax
Subjects: Specific Sciences > Cognitive Science
Specific Sciences > Neuroscience
Specific Sciences > Psychology
Depositing User: Professor Andrew Glennerster
Date Deposited: 28 Sep 2017 15:34
Last Modified: 28 Sep 2017 15:34
Item ID: 13494
Subjects: Specific Sciences > Cognitive Science
Specific Sciences > Neuroscience
Specific Sciences > Psychology
Date: 28 September 2017

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