Stefan Heilmann

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Odors seem to be perceived differently when presented ortho- or retronasally. In this study, stimuli of controlled concentration and duration were applied in either the anterior nasal cavity or epipharynx by means of air-dilution olfactometry. Stimulus concentration was monitored in the olfactory cleft. In Experiment 1, odor thresholds to a food (chocolate)(More)
Certain mammalian olfactory receptor (OR) genes are exclusively or predominantly expressed in spermatozoa [1–2]. One of these receptors, hOR17-4, has been shown to mediate directed chemotactic movement of human sperm in vitro [3]. Whether sperm ORs additionally perform their 'conventional' task in olfaction is a longstanding question. Here, we investigate(More)
To obtain information on the possible role of the vomeronasal duct (VND) in odor perception and human pheromone detection, the present study investigated different aspects of olfactory function, including thresholds for androstenone in adults with or without detectable VNDs. The study also examined correlations between detection thresholds of androstenone(More)
There is evidence that functionally different areas can be distinguished within the nasal mucosa with regard to stimulation site and stimulus properties. The aim of the present study was the comparison of electrophysiological and psychophysical measures obtained in response to mechanical and chemosomatosensory stimulation of two different regions of the(More)
OBJECTIVES To develop a test kit for the simple assessment of retronasal olfactory function and to compare orthonasal and retronasal olfactory function in healthy subjects and patients with olfactory disorders. DESIGN AND PATIENTS We tested 230 individuals with normosmia, hyposmia, and anosmia using grocery-available powders. Initially, 30 different(More)
Many patients with olfactory dysfunction not only experience quantitative reduction of olfactory function, but also suffer from distorted olfactory sensations. This qualitative dysfunction is referred to as parosmia (also called "troposmia") or phantosmia, with the major difference that distorted olfactory sensations are experienced in the presence or(More)
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