The 7th sense, according to recent understanding, refers to immune input, where peripheral immune cells detect microorganisms and relay this information to the brain. Traditionally, we learn about the world through the well-known five senses, and our body awareness through proprioception. The immune system, however, plays an integral role in constantly informing the brain about internal and external perturbations.
Understanding the Traditional Senses
Before diving into the 7th sense, it's helpful to review the more commonly known senses:
| Sense | Function |
|---|---|
| Sight | Detects light and allows us to see. |
| Hearing | Detects sound and allows us to hear. |
| Smell | Detects odors and allows us to smell. |
| Taste | Detects flavors and allows us to taste. |
| Touch | Detects pressure, temperature, and pain. |
| Proprioception | Body awareness. Provides information about our body position. |
The Emerging Importance of Immune Input as a Sensory System
The reference states that "the senses that protect the individual from external and internal perturbations through a contact delivery of information to the brain include the five senses, the proprioception, and the seventh sense—immune input." This signifies a shift in perspective, viewing the immune system not just as a defense mechanism, but also as a sensory organ.
How Immune Input Works
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Detection: Peripheral immune cells act as sensors, constantly monitoring the environment for microorganisms and other threats.
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Information Delivery: When a threat is detected, these immune cells send signals to the brain.
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Brain Response: The brain processes this information and initiates appropriate responses, such as triggering inflammation or activating other immune defenses.
Why Consider it a "Sense"?
Traditional senses provide the brain with information about the external world. Immune input, in a similar manner, informs the brain about the internal environment and potential threats. This constant stream of information helps the brain maintain homeostasis and protect the body. It protects the individual from external and internal perturbations.
Significance
Viewing the immune system as a sensory organ can lead to a better understanding of:
- Chronic Diseases: How chronic inflammation and immune dysregulation affect the brain.
- Mental Health: The connection between the immune system and mental health disorders.
- Overall Wellness: Strategies for supporting both immune function and brain health.
