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Related Concept Videos

Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
The olfactory...
Olfaction01:25

Olfaction

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.
The olfactory receptors are embedded in the cilia of the...
Olfactory Receptors: Location and Structure01:03

Olfactory Receptors: Location and Structure

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...
Signal Sequences and Sorting Receptors01:41

Signal Sequences and Sorting Receptors

Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...

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Related Experiment Video

Updated: Jul 11, 2026

Controlled Odor Mimic Permeation Systems for Olfactory Training and Field Testing
05:54

Controlled Odor Mimic Permeation Systems for Olfactory Training and Field Testing

Published on: January 28, 2021

Serial position functions for recognition of olfactory stimuli.

Andrew J Johnson1, Christopher Miles

  • 1Cardiff University, Cardiff, UK.

Quarterly Journal of Experimental Psychology (2006)
|September 14, 2007
PubMed
Summary

This study on odor recognition memory found that recalling odors in reverse order enhanced memory for recent items, unlike forward recall. This suggests memory accuracy depends on the number of items between learning and testing, challenging existing theories.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Sensory Memory

Background:

  • Investigating the principles of memory recall for sequentially presented information.
  • Examining the influence of presentation and testing order on recognition memory.
  • Understanding the mechanisms underlying recency and primacy effects in memory.

Purpose of the Study:

  • To investigate item recognition memory for sequentially presented odors.
  • To compare the effects of forward and reverse order testing on odor memory.
  • To evaluate existing memory models against empirical findings in olfactory recognition.

Main Methods:

  • Two experiments utilized a two-alternative forced-choice (2AFC) task with sequentially presented odors.
  • Participants learned six odors, followed by a test phase with odor pairs.
  • Testing procedures included blocked and mixed designs, with forward and reverse order presentation of test pairs.

Main Results:

  • Both experiments showed extended recency (better memory for later items) in the reverse testing order.
  • The forward testing order resulted in a null effect of serial position, indicating no clear primacy or recency.
  • Findings challenge the two-component duplex theory by demonstrating memory effects beyond single-item recency.

Conclusions:

  • Recognition accuracy for odors is influenced by the order of testing, with reverse testing enhancing recency.
  • The cumulative number of intervening items, rather than just the immediately preceding item, may better explain recognition accuracy.
  • This study provides evidence for an alternative model of olfactory memory that considers the overall learning context.