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Instead, dopamine fuels our sense of wanting, seeking and craving. Dopamine achieves this by triggering a protein known as DeltaFosB. This pathway becomes a fast and easy route to accessing dopamine.

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The reward circuit also allows us to become addicted to certain behaviours. Dopamine is one of the major chemicals that powers the reward system. Another study conducted by researchers at Cambridge University in compared people addicted to Internet porn to control groups consisting of people who were not addicted to Internet porn.

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Even the relief we feel when we drink water involves opioids. Desensitisation involves low dopamine signalling for everyday activities. During the average hunter-gatherers lifetime, he or she would have sex with only a handful of other people.

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Sensitisation to porn was clearly exhibited by the porn addicted group when they were exposed to Internet porn. Dopamine-producing nerve cells affected by desensitisation originate from the beginning of the reward circuit and make connections with other nerve cells in the reward centre. This will mean urges will become easier to ignore and healthy choices such as exercising and socialising will become far more appealing.