The connectome continues to baffle.

How do fruit-fly maggots make decisions such as scrunch or turn their heads in response to a puff of air? How do humans produce consciousness? The former question is proving as difficult to answer as the latter in terms of how neurons work together. For a start, the complexity of connectivity in neural networks continues to be very challenging to model. Moreover, such networks have significant redundancy. Exogenous variables such as neurotransmitters also affect outcomes. Finally, what about neural networks is genetic in design and what arises post-nasally? The former appears to be assuming greater significance than we thought.

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