请帮忙看下这句话怎么翻译

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weiwlw
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While they slept, scientists played the sound cues for half the images presented during the memory test.

sound 后面的看得不是太明白


And when the subjects woke up and retook the test, they were better at placing the 25 objects that sounded off during the siesta.

想请问下,逗号后半句咋翻译?困惑了很久

这两句话连着的
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