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Related Concept Videos

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...
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...
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...
Associative Learning01:27

Associative Learning

Associative learning is a fundamental concept in behavioral psychology, wherein a connection is established between two stimuli or events, leading to a learned response. This process is critical in understanding how behaviors are acquired and modified. Conditioning, the mechanism through which associations are formed, can be divided into two main types: classical conditioning and operant conditioning, each elucidating different aspects of associative learning.
Classical conditioning, also known...
Observational Learning01:12

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Albert Bandura's observational learning, also known as imitation or modeling, occurs when a person observes and imitates another's behavior. It is a quicker process than operant conditioning. A well-known example is the Bobo doll study, where children who saw an adult acting aggressively towards the doll were more likely to act aggressively when left alone, compared to those who observed a nonaggressive adult. Many psychologists view observational learning as a form of latent learning because...

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Hebbian learning for olfactory sequences.

Andrew J Johnson1, Laura Cauchi, Christopher Miles

  • 1Psychology Research Centre, Bournemouth University, Fern Barrow, Poole, UK. andjohnson@bournemouth.ac.uk

Quarterly Journal of Experimental Psychology (2006)
|October 19, 2012
PubMed
Summary
This summary is machine-generated.

The Hebb repetition effect aids olfactory sequence learning. This suggests memory functions similarly across different senses, supporting amodal sequential learning.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Sensory Perception

Background:

  • The Hebb repetition effect demonstrates that frequently encountered stimuli are learned more effectively.
  • Prior research has primarily focused on visual and auditory modalities.
  • Investigating olfactory learning is crucial for understanding cross-modal memory mechanisms.

Purpose of the Study:

  • To determine if the Hebb repetition effect applies to the learning of olfactory sequences.
  • To explore the commonalities in memory functioning across different sensory modalities.
  • To assess whether sequential learning operates amodally.

Main Methods:

  • Participants performed an olfactory serial-order reconstruction task with sequences of four odors.
  • Odor sequences were presented, followed by a reconstruction phase where participants recalled the order.
  • A repeated sequence was surreptitiously included every third trial to test the Hebb effect.

Main Results:

  • The olfactory serial-order reconstruction task showed a recency effect for both repeated and non-repeated sequences.
  • Performance in reconstructing the repeated odor sequence was significantly improved compared to non-repeated sequences.
  • A clear Hebb repetition effect was observed in the olfactory modality.

Conclusions:

  • The Hebb repetition effect generalizes to olfactory sequence learning.
  • This finding supports the hypothesis that sequential learning mechanisms are amodal and operate across sensory modalities.
  • Memory functioning shows significant commonality across different sensory systems.