The 48 hours of total isolation is over for our three volunteers. Emerging from the dark and silence cells they are asked to repeat the series of tests undertaken before they went into total isolation. The results are startling with even the most basic of tasks proving extremely difficult. Clip taken from the BBC Horizon programme Total Isolation. Watch more high quality videos on the new BBC Worldwide YouTube channel here: http://www.youtube.com/bbcworldwide
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