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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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A Lateralized Odor Learning Model in Neonatal Rats for Dissecting Neural Circuitry Underpinning Memory Formation
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Spatiotemporal masking in pure olfaction

T Radil1, C J Wysocki

  • 1Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic. radil@biomed.cas.cz

Annals of the New York Academy of Sciences
|February 4, 1999
PubMed
Summary
This summary is machine-generated.

Humans cannot lateralize odor stimulation when presented simultaneously in each nostril. However, extensive training and precise timing allowed subjects to distinguish sequential odor delivery, revealing a temporal threshold for olfactory perception.

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Area of Science:

  • Neuroscience
  • Olfactory Perception
  • Sensory Integration

Background:

  • Lateralization of olfactory stimuli, identifying the stimulated nostril, is challenging when presented simultaneously with a blank.
  • Previous research suggests difficulty in discriminating simultaneous odorants versus an odorant and a blank.
  • The role of temporal parameters in olfactory discrimination remains an area for investigation.

Purpose of the Study:

  • To investigate if extensive training can enable lateralization of simultaneous olfactory stimuli.
  • To determine the temporal parameters, specifically stimulus onset-disparity, that allow for discrimination between sequential olfactory stimuli.
  • To explore the threshold for perceiving stimuli as simultaneous versus sequential.

Main Methods:

  • Volunteers underwent extensive training with feedback to attempt lateralization of simultaneous odorant and blank stimuli.
  • A two-channel olfactometer was used to present stimuli with controlled duration and precise mutual timing.
  • The threshold stimulus onset-disparity for inability to lateralize was determined for various stimulus durations.

Main Results:

  • No evidence was found to support lateralization of pure olfactory stimuli when presented simultaneously with a blank.
  • Discrimination became possible when odorant and blank were presented sequentially.
  • The temporal onset threshold for distinguishing sequential stimuli was found to be between 200 and 400 ms, varying with stimulus duration.

Conclusions:

  • Simultaneous olfactory stimulation with a blank prevents nostril lateralization, even with training.
  • A temporal window exists (200-400 ms onset interval) for the olfactory system to discriminate sequential stimuli.
  • The neural basis for this temporal discrimination (olfactory system vs. chemesthesis) requires further research.