Metabolic income inequality in the human body

We’ve been hearing a lot about society’s inequality in terms of wealth and income recently. Many statistics are quoted along the lines of “Britain’s top 1% own as much as the bottom 55%.” This made me think back to my DPhil work, where one of the key factoids constantly in my mind was the disproportionately demanding nature […]

Energy efficient receptive field code

[UPDATE: February 2014] The files and instructions are now hosted on GitHub.   Energy efficient receptive field code by Benjamin Vincent is licensed under a Creative Commons Attribution-Non-Commercial-Share Alike 3.0 Unported License. This minimal set of MATLAB functions will set up a simple neural network to learn receptive fields. These receptive fields minimise an energy function which involves a) […]

Is the early visual system optimised to be energy efficient?

Abstract This paper demonstrates that a representation which balances natural image encoding with metabolic energy efficiency shows many similarities to the neural organisation observed in the early visual system. A simple linear model was constructed that learned receptive fields by optimally balancing information coding with metabolic expense for an entire visual field in a 2-stage […]

Synaptic energy efficiency in retinal processing

Abstract Recent work suggests that the visual system may represent early visual information in an energy efficient manner [Nature 381 (1996); Nature, 381 (1996) 607; Neural Comput. 3 (2001) 799; Curr. Opin. Neurobiol. 11 (2001) 475]. This paper applies the idea of energy efficient representations to understand retinal processing, and provides evidence that centre surround […]