Bodily Oddities

Brain Involuntary

ASMR

A pleasant tingling that starts connected the scalp and moves down the cervix and spine, group disconnected by whispering, tapping, soft sounds, aliases gentle individual attention. Not everyone gets it. A ample online organization is built astir it.

Unclear; estimates 20–70%

Muscle Involuntary

Benign fasciculations

Small visible twitches successful the eyelid, calf, thumb, aliases limb that travel and spell pinch nary weakness. About 70% of patient group get them. They are not a motion of nervus disease.

About 70% of patient people

Ears Involuntary

BPPV

A short, aggravated spinning emotion group disconnected by turning complete successful furniture aliases tipping your caput back. Tiny crystals successful the soul receptor person drifted into the incorrect place. It is the astir communal origin of vertigo and it is very treatable.

About 2.4% of people, lifetime

Nerves Involuntary

Brain freeze

A short, crisp headache successful the forehead a fewer seconds aft acold nutrient aliases portion touches the tile of the mouth. It passes successful nether a minute.

About 30–40% of people

Brain Involuntary

Brain zaps

A little emotion for illustration a mini electrical daze wrong the head, often group disconnected by moving the eyes. It is astir communal erstwhile stopping aliases lowering an antidepressant. It is unpleasant but not dangerous.

15–50% of group stopping an antidepressant get withdrawal symptoms

Brain Involuntary

Call of the void

A sudden, little thought of jumping erstwhile you guidelines location high, aliases of swerving while driving, pinch nary wish to do it. About half of group get it. It is the brain's information strategy being misread, not a hidden wish.

43–60% of people

Eyes Perception

Afterimages

An image that stays successful your imagination aft the point you looked astatine is gone. Bright things time off a same-colour transcript for a moment. Long stares time off a transcript successful other colours.

Everyone

Brain Trick

Ambidexterity

Using some hands arsenic good for each task. Fewer than 1% of group are genuinely ambidextrous. Most group who opportunity they are ambidextrous are mixed-handed: correct manus for immoderate jobs, near for others.

Under 1%

Ears Variation

Attached and free earlobes

Some earlobes bent free and others subordinate the caput directly. Textbooks taught this arsenic 1 gene, but a 2017 study recovered astatine slightest 49 familial regions involved, and the 2 shapes blend into each other.

About 61% attached successful 1 Korean sample

Mouth Variation

Bifid uvula

The uvula, the dangling flap astatine the backmost of the throat, is divided into 2 lobes, successful astir 1 to 2% of people. On its ain it is harmless, but successful a babe it tin beryllium a hint to a hidden cleft of the palate.

1–2% of people

Eyes Perception

Blue arcs of the retina

Look astatine a mini reddish ray successful a acheronian room and 2 faint bluish arcs curve distant from it towards your unsighted spot. You are seeing the nervus fibres of your ain retina ray up.

94% of patient eyes successful 1 session test

Eyes Perception

Blue section entoptic phenomenon

Tiny agleam dots that dart on wiggly paths erstwhile you look astatine a clear bluish sky. They are your ain achromatic humor cells moving done the capillaries of the retina.

Everyone

It felt scary but it is normal

Bones Variation

Accessory ossicles

Small other bones, astir often successful the foot, that shape erstwhile a maturation centre ne'er fuses pinch its main bone. They are harmless but tin beryllium mistaken for fractures connected an X-ray.

Up to 1 successful 5 feet

Brain Perception

Alice successful Wonderland syndrome

Objects, assemblage parts, aliases the full room abruptly look acold excessively big, acold excessively small, aliases acold away. It mostly happens to children, often during a fever aliases infection, and it passes connected its own. In adults it is usually linked to migraine.

6–7% of teenagers (size distortion)

Bones Variation

Cervical rib

An other rib supra the normal apical rib, increasing from the lowest bony successful the neck. About 1 successful 100 group person one, and astir ne'er know.

About 1% of people

Brain Perception

Charles Bonnet syndrome

People who suffer a batch of their show often commencement to spot things that are not there: patterns, faces, mini group successful costume, full landscapes. They cognize the images are not real. It is caused by the eyes, not the mind.

10–40% of older group pinch superior show loss

Brain Involuntary

Derealization and depersonalization

The world abruptly seems flat, distant, aliases for illustration a movie (derealization), aliases you consciousness for illustration you are watching yourself from extracurricular (depersonalization). Most group person a little section astatine immoderate point, usually nether stress.

50–75% of people, astatine slightest once

Muscle Variation

Diastasis recti

A widening of the spread betwixt the 2 halves of the six-pack muscle, seen successful astir each gestation and successful immoderate men. A bulge down the midline erstwhile you beryllium up is the accustomed sign.

Almost each pregnancies; astir 1 successful 3 women a twelvemonth aft birth