Our Brains are Energy Picky Eaters!

Published on April 23, 2023

Just like our bodies have limits to the amount of food we can consume, our brains also have limitations on how much information they can process. The problem is that our brains use up a lot of energy to process information, so there’s only so much it can handle at a time. Imagine trying to eat an entire book in one bite! Our brain’s attention span is like trying to read only two sentences out of that whole book. We end up missing out on more than 99% of the visual input around us. And it’s not just limited to our sense of sight; this bottleneck affects all our senses. If we become less blind to the visual world, our other senses become more blind as a result.

All brains suffer a processing or attentional bottleneck because neural processing consumes a large fraction of available metabolic energy [1]. For example, each second human vision recognizes only about 40 bits out of 20 megabytes of input information into human eyes (roughly two short sentences out of a whole book of text) [2]. We are therefore blind to more than 99% of visual input information. This attentional bottleneck is shared across senses, such that being less blind to visual inputs causes more blindness in the other senses [3].

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