Increasing interest is being shown in the link between olfaction, a complex sensory system, and cognition, particularly in the elderly. Olfaction is known to affect cognitive abilities and mood. In this article, we consider the impairment of olfactory function due to Alzheimer disease (AD), Parkinson disease (PD) and Lewy body disease (LBD), through pathological changes in the peripheral and ce...

INTRODUCTION Phantosmia is the qualitative disorder of olfaction characterized by the perception of odor, usually unpleasant, when there are no odorants present. It may be described as cacosmic (rotten, decayed, fecal), torquosmic (burned, metallic, chemical-like), or mixed. Phantosmia is a relatively uncommon disorder of olfaction and represents around 10% to 20% of olfactory disorders among t...

Olfactory hallucinations (smelling odors that are not present) are intrusive and disruptive yet challenging to investigate because they cannot be produced on demand. In this study, the authors attempted to model olfactory hallucinations using hypnotic suggestions. We gave some subjects a suggestion to smell an odor in the absence of a real odor (positive hallucination) and gave others a suggest...

The LCOT is a self-administered test designed to assess olfactory deficits. Altogether, 525 subjects contributed to the validation. Elderly participants were well represented in this sample. In a validation study (study 1), 407 healthy and 17 anosmic volunteers between 15 and 91 years of age underwent threshold, supraliminal detection, and identification testing. Cutoff values for normosmia and...

Rhinolith is like a stone formation within the nasal cavity. Although stones rarely form in the nasal cavity, the findings of calcified objects or stones anywhere within the body has long been a subject of interest. Though infrequently observed, nasal concretions can be the source of bad smell from the nose and therefore a social concern for the patient. The salient features of such Rhinoliths ...

This study investigated whether an odor can affect infants' attention to visually presented objects and whether it can selectively direct visual gaze at visual targets as a function of their meaning. Four-month-old infants (n = 48) were exposed to their mother's body odors while their visual exploration was recorded with an eye-movement tracking system. Two groups of infants, who were assigned ...

Background: Covid-19 is a spectrum of infection not only causing fever and respiratory changes but including alteration in chemosensory functions including; olfactory dysfunction gustatory dysfunction. In covid-19, dysregulation could be treated with either systemic steroids or topical steroids. Objective: To assess compare role regaining normal functions. Materials & Methods: A Randomized ...

BACKGROUND Navigation based on chemosensory information is one of the most important skills in the animal kingdom. Studies on odor localization suggest that humans have lost this ability. However, the experimental approaches used so far were limited to explicit judgements, which might ignore a residual ability for directional smelling on an implicit level without conscious appraisal. METHODS ...

A single man aged 65 years was referred to the Department of Venereology in 1949 on account of extensive necrosis of the skull and gangrene of the right foot. The precipitating factor was an obnoxious smell, attributed to a blocked drain, which was reported by some of his neighbours to the local Sanitary Authority. Through the Medical Officer of Health, the patient was eventually compelled to a...