Understanding smell (olfactory) – how the five senses work
From the book – Chapter 19: How Five Senses Actually Work
Smell (olfactory)
How it works
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Odor molecules enter the nose during breathing.
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Olfactory receptors detect specific chemical compounds.
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The olfactory bulb processes initial information.
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Signals travel directly to the limbic system (amygdala, hippocampus).
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Orbitofrontal cortex identifies and interprets smells.
Key structures: olfactory epithelium, olfactory bulb, limbic system, orbitofrontal cortex.
Unique feature: smell is the only sense that bypasses the thalamus and goes directly to the limbic system (emotion and memory centre). This is why smells can trigger powerful emotional memories instantly.
Mental health connection
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Loss of smell (anosmia) is linked to depression.
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Smell disturbances occur in schizophrenia, depression, and Alzheimer's.
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Aromatherapy can reduce anxiety and improve mood.
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Traumatic memories are often triggered by specific smells.
Clinic note. If a smell means last year's fire, work with a trauma-informed helper. Do not force the soap.
Read the full chapter – Chapter 19: How Five Senses Actually Work
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Shloks
- Bhagavad Gita 15.9 – Presiding over ear, eye, touch, taste and smell, and over the mind, the person enjoys the objects.
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