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Why Can't You Tickle Yourself?
A leading explanation: your brain predicts the touch your own movements will cause and turns it down, so a self-made tickle feels weak. Delay that touch by a fraction of a second and it gets more ticklish. Prediction is a well-supported account, not the whole story.
Transcript
When you move, your brain is thought to predict the sensations that movement will cause.
Touch that matches the prediction tends to be dampened, so your own tickle feels weaker than the same touch from someone else.
In one brain-imaging study, touch-processing areas responded less to self-made tickles. The researchers proposed that the cerebellum supplies the prediction.
When a robot delayed people's own strokes by a fraction of a second, the touch felt progressively more ticklish.
References
- Blakemore S-J, Wolpert D, Frith C (1998) Central cancellation of self-produced tickle sensation. Nature Neuroscience 1:635–640 — https://doi.org/10.1038/2870
- Blakemore S-J, Wolpert DM, Frith CD (1999) The cerebellum contributes to somatosensory cortical activity during self-produced tactile stimulation. NeuroImage 10:448–459 (author copy, Wolpert Lab, Columbia University) — https://wolpertlab.neuroscience.columbia.edu/sites/default/files/content/papers/BlaWolFri99.pdf
Narration uses a synthetic voice. Animations are simplified illustrations of the mechanisms described. Educational content, not medical advice.
