But more research is needed, says Ketter. The study does not explain the connection or show a causal relationship, he said.

但是还需更多研究，Ketter说，这项研究并未解释这种联系，也没有表现出因果关系。

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For those of us not faced with such an extreme problem, Terence Ketter, a psychiatrist at Stanford University in California, is more cautious.

特伦斯·凯特是加利福尼亚州斯坦福大学的精神科专家，他显得更为谨慎。 他认为，我们中的大部分人并不需要面对这么极端的问题。

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Verhaeghen's theory that rumination contributes to negative emotions generally sounds plausible and in some ways consistent with his own views, said Ketter.

Ketter称，Verhaeghen关于深思导致负面情绪的理论大致上言之成理，也符合他自己的观点。

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Terence Ketter is professor of psychiatry and behavioral science at Stanford University.

CNN: Experts ponder link between creativity, mood disorders

Ketter and his colleagues compared a healthy control group with bipolar patients, depression patients, and a control group of graduate students in writing and the arts.

CNN: Experts ponder link between creativity, mood disorders

But more research is needed, says Ketter.

CNN: Experts ponder link between creativity, mood disorders