This multicenter study enrolled a total of 162 normosmic subjects in four consecutive experiments. HR is defined as the perceivable hedonic distance between two oppositely valenced odors, while HD serves as an indicator for overall hedonic perception of odors. SSParoT uses hedonic estimates of two oppositely valenced odors (pleasant and unpleasant) to assess hedonic range (HR) and hedonic direction (HD), which represent qualitative olfactory perception. The newly developed test is called Sniffin’ Sticks Parosmia Test (SSParoT). We have developed a test method which measures qualitative olfactory function based on the odors of the Sniffin’ Sticks Identification subtest. Parosmia and phantosmia represent the two main subgroups of qualitative impairment and are currently diagnosed based on patient history only. Qualitative olfactory dysfunction is characterized as distorted odor perception and can have a profound effect on quality of life of affected individuals.
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