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The indication time was changed during successful training from 1 s to 2 s. While the reward was eaten, the device’s software randomly and automatically assigned new positions to the slides for the following session with again only one hole presenting the positive odor sample. The dog, its handler, and a person observing the study were blinded during the double-blinded study. All personnel stood behind the dog during the test runs to avoid distraction. The device recorded automatically the number and time length of each nose dip into the scent holes and the location of the positive and negative samples. This was verified by manual time-stamped video analysis.
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