(BBC) — Ariel Sharon, the former Israeli prime minister who has been in a coma for seven years, has shown significant signs of brain activity, doctors say.

A team of Israeli and American scientists say new tests showed he responded to external stimuli.

The activity increased when he was being shown pictures of his family and played a recording of his son’s voice.

The 84-year-old has been in a coma since 2006, when he suffered a massive stroke.

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