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Our experiments include simulated falls by several subjects. They perform in a user-independent setting, where, for each test video, the subject appearing in the test video does not appear in any of the training data used to detect falls in that video.

In the above sentence, is the usage of perform correct, or should I use "they are performed" instead?

  • You're right, this is not correct. It should be "were performed" or "have been performed" or something like that. – Cerberus Feb 25 '13 at 18:33
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It's an awkward sentence. As written, you expect They to refer to the falls rather than the performers, because that's the head of the precedent noun phrase; but the author obviously intends they to refer to the performing subjects.

The ambiguity might be avoided with rewriting:

Our experiments include simulated falls by several subjects, who perform in a user-independent setting: that is, the subject who falls in each test video does not appear in any of the training data used to detect falls in that video.

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