Mind Uploading: Brain Facts
What's the scale of things here? The following lengths (from Posner p. 305) give approximate sizes for structures in the nervous system: 0.001 mm: synapses (tip of a connection between neurons) 0.1 mm: neurons (brain cell) 1 mm: local circuits (small networks of cells) 10 mm: maps (spatially organized topographic maps) 100 mm: systems (e.g., the visual system) 1000 mm: the central nervous system (including spinal cord) How many things are we talking about? Short answer: a LOT. Long answer: Per cubic millimeter (mm^3), there are about 10^5 neurons and 10^9 synapses. How fast does the brain work? Not very fast by computer standards. How are memories stored in the brain? This is one of the great questions of neuroscience, and research has nearly converged on an answer. OK, so neurons and connections, is that it? Well, there's more in the brain than that. More Brain Facts and Figures are available from the University of Washington.
• Brain Augmentation