> What we do know: neurons carry electrical impulses across their synapses to trigger other neurons to fire, and more frequently used synapses are strengthened

> What we do know: neurons carry electrical impulses across their synapses to trigger other neurons to fire, and more frequently used synapses are strengthened while infrequently used ones are pruned. This is not all that dissimilar to how a multi-layer perceptron is trained ANNs have been inspired by biological processes, but in practice you have to squint very tightly to see the similarity. Biological neurons are multiple orders of magnitude more connected than the nodes in an ANN, plastic in terms of their connectedness and continuously learning, and their activations are also affected in complex ways by the levels of various transmitter molecules in the brain.