"We're looking at the direct effect of a single dose of paroxetine," says van der Veen, who adds that the findings might help explain why some people report blunted emotions when taking SSRIs.

范·德·维恩表示“我们正在观察单剂量帕罗西汀的直接疗效”，他补充说这些发现也许会帮助解释为何一些人在服用血清再吸收抑制剂时报告有迟钝情绪。

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Van der Veen now wants to find out whether genetic differences in serotonin production affect the tendency to cry.

现在，范·德·维恩打算发现血清素生产上的基因差异是否影响哭泣的倾向性。

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"He was about two metres tall, he was huge, and he had small glasses, " Mr Van Veen recalls.

BBC: Animal behaviour in the boardroom

Ape Management combines Mr Van Veen's two passions.

BBC: Animal behaviour in the boardroom

The mainly female audience of business people attending the course nod violently when Mr Van Veen describes how most offices have a set of dominant males, who slap each other's backs, stamp their feet and draw themselves up tall.

BBC: Animal behaviour in the boardroom