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Most commonly through nerve impulses (electric pulses). For example touch organs in the fingertips register touch, and send on their info over nerve bundles to the brain. It is quick and fast. Other mechanisms that are more slow and diverse due to their signalling mechanism, have also been identified. An example is the influence of light on mood. As the theory goes, being in continuous low-light surroundings (e.g. above the Artic Circle during winter) influences hormone and neurotransmitter levels, and thus chemically influences the mood of humans.

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