For me it’s because when someone else is massaging me there’s a little element of “surprise”. You don’t know where they’re going to rub next and when they hit the right spot it just feels amazing. If I’m massaging myself I know what’s coming up and it still helps release muscle tension, but it doesn’t “hit” the same when someone else is doing it.
There are two basic parts to any touch stimulus:
1. The signal that is sent from your nerves to your brain.
2. Your brain’s expectation and interpretation of the signal that has traveled to it.
The second part works in a very interesting way, and often when your brain knows that you are the one performing the action, it will “turn down” the sensitivity or magnitude of the signal as it processes it.
To see a very interesting example of other ways that #2 can happen, watch this video of the [rubber hand illusion](https://youtu.be/sxwn1w7MJvk?si=A7voZU6-AfwnlRtY).
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