Alice in Wonderland syndrome

How it works

The eyes work normally. The distortion happens later, where the brain works out how big things are and how far away¹. The main forms have names. Micropsia: things look too small. Macropsia: too big. Teleopsia: too far away. Pelopsia: too close². Body parts can seem to swell or shrink. Time can feel too fast or too slow. Many episodes come with a sense of unreality¹. An episode usually lasts minutes and rarely more than an hour¹.

In children the most common trigger is infection, especially Epstein-Barr virus, the cause of glandular fever¹⁴. Influenza, chickenpox, and COVID-19 have all been reported as triggers¹. Fever alone can set it off. In adults the usual trigger is migraine, and the episode can come before, during, or instead of the headache¹⁵. Rarer causes include epilepsy and some drugs¹.

The brain region most often implicated is the junction of the temporal, parietal, and occipital lobes, where the brain combines what a thing is with where it is³. One interpretation uses the brain’s two visual streams. The ventral stream, in the temporal lobe, handles what an object is and its relative size. The dorsal stream, in the parietal lobe, handles absolute position and movement³. If fever disturbs one stream more than the other, you could see a tower that looks enormous and yet moves through the room like an ordinary object. This is an interpretation, not a proven mechanism.

The only brain scan taken during an episode fits the idea. In 2010, a 12-year-old with micropsia after a viral infection showed reduced activity in the visual cortex and excess activity in the right superior parietal cortex. Both returned to normal within 4 to 6 weeks³. In 2024, a study of 37 cases caused by brain lesions found that all of them touched one circuit. It links the right extrastriate body area, which processes bodies and objects, to the left inferior parietal lobule, which processes scale¹. The authors summarised it as an Alice in Wonderland circuit rather than a spot¹.

How common it is

A review of 169 published cases found that 65% were under 18, with an average age of about 9¹. Clinical cases undercount. A survey of 3,224 Japanese adolescents found size distortion in 6.5% of boys and 7.3% of girls¹. Up to 30% of adolescents report at least one symptom¹. Among adult migraine patients, 16.5% report AIWS symptoms¹. Doctors think it is underdiagnosed because children rarely mention it.

Is it a problem?

Usually not. In children it goes with an infection and stops within days to weeks once the illness passes¹. Nothing is damaged. Telling a child what it is helps, because the experience is frightening.

See a doctor if the episodes keep coming back, last more than an hour, happen without a fever or migraine, or come with a severe headache, seizure, weakness, confusion, or loss of vision. Those need to be checked.

History and culture

The British psychiatrist John Todd described and named the syndrome in 1955¹. Lewis Carroll’s diaries record severe headaches with visual fortification patterns, which are classic migraine aura⁶. Todd suggested that Carroll drew Alice’s growing and shrinking from his own experience¹.