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Writers of novels and songs have for centuries claimed that love is a drug. Scientists have now gone a [stair / step] further to prove this assertion. They conducted tests [on / in] the romantic relationships among prairie [voles / vole] . Different pairs of the mouse-like [indents / rodents] were tested for levels of dopamine - a neurotransmitter that plays a [roll / role] in our seeking pleasure and a [craving / carving] for addictive things. It can provide an intense feeling of [rewild / reward] . The researchers found that the voles released large [amounts / amount] of dopamine when they were physically with their "established partner". Researcher Dr Zoe Donaldson said parts of the voles' brains lit up "like a [grow / glow] stick" when they were reunited with their mates, and [dammed / dimmed] when with unknown voles.

The researchers said their [studious / studies] help to explain much about the complexities of human relationships. They say dopamine in our brains plays a [quay / key] part when falling in love, and in the [grief / glee] experienced when breaking [down / up] with a partner. Dr Donaldson said: "As humans, our [entirely / entire] social world is basically defined [at / by] different degrees of selective desire to interact [with / on] different people, whether it's your romantic partner or your [close / closed] friends." She added: "This research suggests that certain people leave a unique chemical imprint on our brain that drives us to maintain [them / these] bonds over time." Research also suggests that women get over a breakup, and fall out of [loving / love] faster than men.