However, divisions remain among psychiatrists over whether extended solitary confinement causes mental illness and how best to reform such prison practices.

然而心理学家关于监禁是否是引发精神不健康的看法分歧仍然存在，也没提出更好的替代方案。

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Juliet Lyon, director of the Prison Reform Trust, said closing prisons and reducing prison numbers "offers major social and economic gains" but warned it "would be a gigantic mistake if the justice secretary were to revive the discredited idea of titans and pour taxpayers' money down the prison building drain" instead of investing in crime prevention, healthcare and community solutions to crime.

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The Prison Reform Trust said it was right questions were asked but the prison was following the rules.

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Juliet Lyon, director of the Prison Reform Trust, said new guidelines and the introduction of indeterminate terms meant prison sentences were "far tougher and far harsher" than 10 years ago.

BBC: Last Updated: Friday, 9 March 2007, 16:15 GMT