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Related Concept Videos

Physiology of Smell and Olfactory Pathway01:20

Physiology of Smell and Olfactory Pathway

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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.
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Olfaction01:25

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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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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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Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex.
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Role of Affect in Interpersonal Attraction01:24

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Affect plays a crucial role in shaping interpersonal evaluations and perceptions. Emotions influence how individuals judge and respond to others, often determining whether interactions are viewed positively or negatively. This effect can manifest directly through interactions with the person in question or indirectly via associations with unrelated emotional experiences.Direct Effects of Affect on AttractionAffect directly influences interpersonal attraction when a person’s behavior...
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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Related Experiment Video

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Simple and Computer-assisted Olfactory Testing for Mice
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Aversion and attraction through olfaction.

Qian Li1, Stephen D Liberles1

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Current Biology : CB
|February 5, 2015
PubMed
Summary
This summary is machine-generated.

Animals use odors to predict rewards or punishments, guiding behavior. This review explores how olfactory receptors and neural circuits process odor valence across species, from basic attraction to learned responses.

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Area of Science:

  • Neuroscience
  • Olfactory system research
  • Animal behavior

Background:

  • Sensory cues, particularly odors, are crucial for survival, signaling potential rewards (food, mates) or punishments (predators, toxins).
  • Attractive and aversive odors are detected by intermingled olfactory sensory neurons with similar receptor types and central nervous system projections.
  • This overlap raises fundamental questions about how the brain distinguishes and responds to odor valence.

Purpose of the Study:

  • To review the current understanding of how olfactory systems process odor valence (attraction vs. aversion).
  • To discuss the neural circuits, receptors, and developmental factors involved in innate and learned odor responses.
  • To explore principles of odor valence processing across diverse species, including nematodes, insects, and vertebrates.

Main Methods:

  • Literature review of studies on olfactory processing and behavior in various animal models.
  • Analysis of research on olfactory receptors and neural circuit organization.
  • Synthesis of findings related to innate and learned odor responses and their modulation.

Main Results:

  • Odor valence is extracted through complex olfactory circuits, despite similarities in receptor families and neural projections.
  • Innate odor responses are shaped by development and modulated by internal states.
  • The relationship between innate and learned odor responses is a key area of ongoing research.

Conclusions:

  • Understanding the neural basis of odor attraction and aversion provides critical insights into brain function.
  • The organization of olfactory neural circuitry is fundamental to processing stimulus valence.
  • Further research is needed to fully elucidate how the brain deciphers and acts upon olfactory information regarding reward and punishment.