Dr Lewis said: "We only tend to see men's pulses really racing when they are shown action films like Die Hard."

Neuropsychologist David Lewis, of the Mind Laboratory, said: "By mirroring inside a person's head what is unfolding before their eyes, neurons enable movie fans to unconsciously experience the intense emotions depicted.

"This means if a plot involves romance, viewers will experience the same response as if it was happening to them.

"The more romantic the movie, the more physically and emotionally aroused viewers become as mirror neurons go into overdrive.

"In addition, powerful chemicals related to amphetamines will be released into the blood, producing the giddy high often experienced with romance.

"Mirror neurons are a relatively recent discovery, but they help us develop empathy.

"They are why people get moved to tears or get excited by what they are seeing, because they become emotionally involved."

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