You can't tickle yourself because your brain is constantly recalibrating where your body ends and the world begins.
April 10, 2026
Original Paper
Sensory Attenuation Reflects Proprioceptive Recalibration Rather Than Motor Forward Models
SSRN · 6545167
The Takeaway
For decades, scientists thought we 'dull' our own touch because the brain predicts its own motor movements. This study suggests it's actually a deeper process of the brain updating its internal map of your body's position in real-time.
From the abstract
Forward models are widely regarded as the standard framework for predicting and attenuating the sensory consequences of self-generated actions. Sensory attenuation is a prime example, traditionally attributed to efference-copy–based predictions of the tactile consequences of self-touch. Here, we systematically investigated the mechanisms underlying sensory attenuation in 220 participants across six experiments. Using a device that enabled passive hand transport to mimic self-triggered self-touch