Does your own hand tickle you as much as a friend's?
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After you watchDoes your own hand tickle you as much as a friend's?
The short answer
Self-produced touch often feels less ticklish because the brain predicts sensory effects of its own movements. A delay or spatial mismatch can weaken this attenuation, so a self-controlled robot touch can feel more ticklish.
Try this next
- What if the delayed touch became predictable? Predict how learning a repeated delay could change the match between expected and actual touch.
The whole story
How it works
A copy of a movement command helps predict what touch will arrive and when. This model compares identical on-time and delayed touches. Its response bars illustrate sensory attenuation; they are not measurements of a real person.
What people get wrong
A self-produced touch is not always perfectly predicted or completely erased. Timing, location, touch type and the person all matter.
The catch
Predictions help distinguish the sensory effects of our movements from other events, but a mismatch can make a touch feel stronger. Predictions can also adapt with experience.
Questions kids ask
Could a machine I control tickle me?
Yes. Experiments found that adding a delay or spatial change can make a self-controlled robot touch feel more ticklish.
Does surprise alone cause every tickle?
No. Ticklishness also depends on the place and kind of touch, the person and the context.
Talk about it
- Which changed in the robot model: touch strength or timing?
- Why might a self-controlled touch fail to match its prediction?
For grown-ups
Robot-touch experiments found increased ticklishness with temporal delays or spatial perturbations. The simplified model uses an illustrative timing window; it is not a calibrated neural model.
Keep going
What else makes you wonder?
- How might repeated practice change the expected timing?
