The paired and unpaired rats in the two boxes were subsequently exposed to five tones used in the fear-conditioning phase of the experiment.
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Compared with the unpaired group, the paired group showed significantly increased fear responses in the box that didn't have the other rat's scent.
After 24 hours, the so-called paired and unpaired rats were placed in two boxes, one of which had been previously occupied for three hours by another rat of the same species that imparted its scent.
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