What happens in your brain when you get tickled?

Updated

When tickled, the somatosensory cortex detects the touch, the cerebellum flags it as unexpected, the insula and anterior cingulate process the unsettling feeling, the brainstem triggers laughter, and the motor cortex drives squirming.

Somatosensory Cortex, Cerebellum, Insula, Anterior Cingulate Cortex, Hypothalamus, Motor Cortex lit up on the Brain Atlas 3D brain: what happens in your brain when you get tickled
Figure. The brain regions that light up when you get tickled, in order: Somatosensory Cortex (touch detected), then Cerebellum (unexpected signal), then Insula (unsettling feeling), then Anterior Cingulate Cortex (emotional conflict), then Hypothalamus (autonomic response), then Motor Cortex (squirm and pull away).

Watch it light up on the 3D brain

Brain regions that light up

OrderRegionWhat it does here
1Somatosensory CortexLight touch on ticklish skin activates the somatosensory cortex.
2CerebellumThe cerebellum compares actual touch with predicted sensations, flagging it as surprising.
3InsulaThe insula processes the interoceptive and emotional aspects of the tickle.
4Anterior Cingulate CortexThe anterior cingulate cortex monitors the conflict between laughter and discomfort.
5HypothalamusThe hypothalamus triggers autonomic responses like increased heart rate.
6Motor CortexThe motor cortex initiates voluntary squirming and withdrawal movements.

1. Somatosensory Cortex: touch detected

Step 1 of what happens in your brain when you get tickled: Somatosensory Cortex lit on the Brain Atlas 3D brain
Figure 1. Somatosensory Cortex, touch detected: Light touch on ticklish skin activates the somatosensory cortex.

The somatosensory cortex receives tactile signals from the skin, mapping the body surface. Ticklish areas like ribs or feet are especially sensitive due to their vulnerability and unpredictability.

2. Cerebellum: unexpected signal

Step 2 of what happens in your brain when you get tickled: Somatosensory Cortex, Cerebellum lit on the Brain Atlas 3D brain
Figure 2. Cerebellum, unexpected signal: The cerebellum compares actual touch with predicted sensations, flagging it as surprising.

When you are tickled by another person, the cerebellum cannot predict the exact timing and location, so it signals a mismatch. This prediction error amplifies the tickle response; self-tickle is suppressed because the cerebellum predicts it.

3. Insula: unsettling feeling

Step 3 of what happens in your brain when you get tickled: Somatosensory Cortex, Cerebellum, Insula lit on the Brain Atlas 3D brain
Figure 3. Insula, unsettling feeling: The insula processes the interoceptive and emotional aspects of the tickle.

The insula integrates bodily sensations with emotional states, perceiving the tickle as slightly unpleasant or ambiguous. It also contributes to the urge to escape the stimulation.

4. Anterior Cingulate Cortex: emotional conflict

Step 4 of what happens in your brain when you get tickled: Somatosensory Cortex, Cerebellum, Insula, Anterior Cingulate Cortex lit on the Brain Atlas 3D brain
Figure 4. Anterior Cingulate Cortex, emotional conflict: The anterior cingulate cortex monitors the conflict between laughter and discomfort.

The ACC is active during conflicting emotional experiences, such as tickling, which is both playful and aversive. It modulates the emotional response and contributes to social bonding.

5. Hypothalamus: autonomic response

Step 5 of what happens in your brain when you get tickled: Somatosensory Cortex, Cerebellum, Insula, Anterior Cingulate Cortex, Hypothalamus lit on the Brain Atlas 3D brain
Figure 5. Hypothalamus, autonomic response: The hypothalamus triggers autonomic responses like increased heart rate.

The hypothalamus coordinates autonomic changes like increased heart rate, linking the emotional brain to the body. Tickling-induced laughter is thought to be a primitive reflex, not always tied to humor.

6. Motor Cortex: squirm and pull away

Step 6 of what happens in your brain when you get tickled: Somatosensory Cortex, Cerebellum, Insula, Anterior Cingulate Cortex, Hypothalamus, Motor Cortex lit on the Brain Atlas 3D brain
Figure 6. Motor Cortex, squirm and pull away: The motor cortex initiates voluntary squirming and withdrawal movements.

While much of the tickle response is reflexive, the motor cortex can override or modulate movements to escape the tickling. It sends signals to muscles to twist, push away, or protect ticklish areas.

Good to know

  • You cannot tickle yourself effectively because the cerebellum predicts the sensory consequences of your own movements and cancels the tickle response.
  • Tickling-induced laughter is distinct from humor-based laughter and may engage different neural pathways.
  • The sensitivity of ticklish areas varies widely, with the soles of the feet and underarms being common sites.

Tickled vs. Self-tickle

When someone else tickles you, the cerebellum cannot predict the touch, leading to a strong tickle response. When you try to tickle yourself, the cerebellum forecasts the sensation and dampens somatosensory cortex activity, so the tickle is greatly reduced or absent.

Test yourself

  1. Which brain region is primarily responsible for processing the tactile sensation of a tickle?

  2. Why can't you tickle yourself?

  3. Which brain region is most associated with the involuntary laughter during tickling?

0 of 3 answered · 0 correct

Simplified: many regions work together at once, and this shows the main players in the order they act.