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. 2016 Dec 9;11(12):e0168006. doi: 10.1371/journal.pone.0168006

Fig 1. Experimental protocol.

Fig 1

First, the subjects had a 30-s pre-rest. Then, the subjects were given an olfactory stimulus for 10 s, followed by a 30-s post-rest period and a 30-s period to complete a questionnaire on odor intensity and subjective assessments of hedonic and irritating odors. The 130-s cycles for each odorant were repeated six times consecutively.