It is in these tiny clumps of neurons that human pleasure is felt.

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What I was feeling was the same complex firing of neurons and synapses that ascribe human emotion to the furry, the liquid eyed, the infantile.

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In human beings, it was found that mirror neurons not only simulate actions, they also reflect intentions and feelings.

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And it turns out that some of the regions where monkeys have mirror neurons correspond to areas of the human brain that handle language.

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They used a modified version of the HIV virus to transfer a gene for neprilysin to neurons of genetically modified mice which produced human beta-amyloid.

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Human brains (1.4kg and 100 billion neurons) will come later, when all the wrinkles have been ironed out in rodents, and proper methods devised to analyse the results.

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Some experts estimate that there are four billion devices connected to the internet but, according to researchers at the Stanford School of Medicine, a typical healthy human brain contains about 200 billion nerve cells, or neurons, linked to one another via hundreds of trillions of tiny contacts called synapses, that function like microprocessors.

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Deep-learning software tries to emulate, albeit in a still primitive way, the activity in layers of neurons in the neocortex, the part of the human brain where thinking occurs.

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Threaded on a wire one-fifth the thickness of a human hair, these tiny seeds of light can be injected to activate special networks of light-sensitive neurons.

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