Interoception & Alexisomia

Interoception, often called the “eighth sense,” involves specialized receptors throughout your body that send information to your brain about your internal state. For neurodivergent individuals, interoceptive experiences can be significantly different—sometimes heightened, sometimes muted, or processed uniquely. Alexisomia, first described by Yujiro Ikemi in 1979, specifically refers to difficulties with recognizing body sensations. While different from alexithymia (difficulty identifying emotions), alexisomia involves feeling disconnected from physical states, making it hard to identify when you’re hungry, tired, ill, or uncomfortable, even when your body is sending these signals.

Key Aspects

Interoceptive Sensing System
- Physical needs recognition: Detecting hunger, thirst, bathroom needs, temperature changes
- Physiological awareness: Noticing heart rate, breathing patterns, muscle tension
- Pain and discomfort detection: Identifying location and intensity of pain
- Energy monitoring: Recognizing fatigue, alertness, or restlessness
- Emotional body connections: Feeling physical components of emotions (racing heart with fear)
Alexisomia Challenges
- Disconnection from bodily signals: Missing hunger cues until extremely hungry
- Delayed recognition: Not noticing pain, illness, or fatigue until severe
- Communication difficulties: Struggling to describe physical sensations to others
- Self-care impacts: Missing basic needs like food, rest, or temperature regulation
- Safety concerns: Potential for pushing beyond physical limits due to reduced awareness

In Their Own Words

My body feels like it’s speaking a language I barely understand. I might suddenly realize I’m absolutely starving because I completely missed the earlier, gentler hunger signals. It’s like everyone else got an owner’s manual to their body, but mine came with pages missing.

My body could be screaming at me to eat or rest, but I don’t register it until I’m completely depleted. It’s like having a dashboard with broken gauges—I know intellectually I have needs, but I can’t feel the signals until they’re critical. When doctors ask about my symptoms, I freeze up because translating these vague physical sensations into words feels impossible.

In Everyday Life

Missed Meals: Someone might work through lunch without noticing hunger until they suddenly feel weak or irritable
Weather Disconnection: Going outside without appropriate clothing because they don’t register being too cold or hot until symptoms become severe
Exercise Complications: Pushing through exhaustion during physical activity, unaware of distress signals until reaching complete exhaustion or injury
Delayed Medical Care: Minor infections or illnesses going unnoticed until serious because early physical warning signs weren’t recognized
Sleep Disruption: Missing fatigue cues and staying awake far past when their body needs rest, leading to chronic exhaustion
Emotional Confusion: Misinterpreting physical sensations as emotions or vice versa (mistaking anxiety for hunger or excitement for anxiety)

Why This Matters

Understanding interoception and alexisomia is crucial because they directly impact health, safety, and wellbeing. For neurodivergent individuals, who experience higher rates of interoceptive differences including alexisomia, this recognition can lead to tailored support strategies rather than assumptions of carelessness or inattention. Interoception forms the foundation of self-care, emotional regulation, and bodily safety. Recognizing these differences removes shame around “not knowing what should be obvious” and validates that body awareness is a skill that develops differently across people. Healthcare providers working with patients who have alexisomia need to ask specific, direct questions about physical states rather than relying on patients to volunteer this information.

Historical Development

1800s: First scientific recognition of internal sensing by physicians studying physiological responses
1906: Term “interoception” coined by Charles Sherrington to distinguish internal sensing from external senses
1979: Japanese psychosomatic medicine specialist Yujiro Ikemi first described the concept of alexisomia
1990s: Growing recognition of interoception’s role in emotion and consciousness; expanded research on alexisomia connections with chronic illness management
2000s: Brain imaging studies identify the insula as a key region for interoceptive processing
2010-present: Expanded understanding of interoception and alexisomia in neurodevelopmental conditions, with specialized research developing around these distinctions

Alexithymia (difficulty identifying and expressing emotions)
Proprioception (awareness of body position and movement)
Sensory Integration
Neuroception (perception of safety/danger)
Embodiment (how we experience ourselves through our bodies)
Somatic awareness (consciousness of physical sensations)
Body-mind connection (relationship between physical and mental states)
Autonomic Nervous System Function

Note: Different neurodivergent experiences can involve various interoceptive patterns. Some autistic individuals report difficulty identifying specific sensations, while some ADHD experiences include not noticing signals until they’re urgent. For those with sensory processing differences, interoceptive signals might be experienced at altered intensities or get lost among other sensory input. These differences aren’t flaws—they’re important aspects of neurodivergent embodiment that deserve understanding and accommodation.

References