Figure 1
From: Longer latency of sensory response to intravenous odor injection predicts olfactory neural disorder
Two types of olfactory function tests.
(a) Two olfactory function tests distinguished by stimulus route: orthonasal (upper) and retronasal (lower). Sagittal views of the nasal cavity are shown (left, anterior; right, posterior). UPSIT, University of Pennsylvania Smell Identification Test; T & T olfactometer test, an orthonasal olfactory test used widely in Japan. (b) Human intravenous olfactory (IVO) test. In the IVO test, two factors, the onset latency from the injection of prosultiamine to the recognition of smell and the duration between the recognition and disappearance of smell, are measured to detect olfactory disorders.
