Nerves · Body soundHiccups
An involuntary spasm of the breathing muscles followed by closure of the glottis produces the characteristic hic.
Frequency: CommonNerves
Nerves · Body sound
Nerves · ReflexSleep start
A brief muscle jerk can occur while falling asleep, sometimes with a feeling of falling.
Frequency: Common
Nerves · PerceptionThe rubber hand suddenly feels like mine
Synchronous seeing and touch can make an artificial hand temporarily seem part of one’s own body.
Frequency: Varies by individual
Nerves · Involuntary responseAwake but unable to move
When falling asleep or waking, REM-related muscle inhibition briefly persists despite awareness.
Frequency: Varies by individual
Nerves · Involuntary responseThe REM muscle brake
During REM sleep, a brainstem network suppresses skeletal muscles and usually prevents acting out dreams.
Frequency: Common
Nerves · Involuntary responseDreams become physical
In a rare disorder, normal REM atonia is partly absent, so dreams can be acted out with movement.
Frequency: Rare
Nerves · Involuntary responseYawning
Yawning is an involuntary sequence of inhalation, mouth opening, and stretching.
Frequency: Common
Nerves · ReflexThe protective corneal reflex
A stimulus on the cornea can trigger rapid closure of both eyelids.
Frequency: Common
Nerves · PerceptionWhen cold and warm burn
Simultaneous warm and cold stimuli can paradoxically feel like burning heat.
Frequency: Varies by individual
Nerves · ReflexSneezing
Irritation of the nasal mucosa triggers a coordinated exhalation to remove particles.
Frequency: Common
Nerves · ReflexCough
Irritation in the airways activates a protective reflex with a forceful burst of air.
Frequency: Common
Nerves · ReflexStartle response
A sudden stimulus can trigger a whole-body response within milliseconds.
Frequency: Common
Nerves · Involuntary responseItch-scratch reflex
Scratching can briefly suppress an itch, but excessive scratching increases skin irritation.
Frequency: Common
Nerves · PerceptionPhantom limb sensation
After an amputation, sensations can seem to come from the missing body part.
Frequency: Varies by individual
Nerves · Involuntary responseTransient pressure-related paresthesia
After sitting awkwardly, a foot may become numb and then tingle when pressure is released because its nerves were temporarily impaired.
Frequency: CommonSurprisingly quiet here.
Try another term or fewer filters.