system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the human body like vibrations so much?

I have noticed that the human body really likes vibrations a lot. Like massage machines, when somebody roughens up our hair, etc. I was wondering what could be the reason for it.
gpt
> massage machines, when somebody roughens up our hair

Basically considering these as 'touch sensations', there are two aspects, the psychological aspect and the physiological aspect.

Psychological factor is that being touched or touching someone else are important modes of human interaction next to language.  Studies show that the hormone oxytocin has a role in this, which is the hormone of love and attachment.  That's why we feel good when we get a handshake, hug or a shoulder massage to a congratulatory pat on the back.  Secondly, the physiological aspect, the stimulation, increased blood flow, etc.  When we get a massage, our brain receives the sensation because our skin cells send the nerve signal from skin to brain and then our body released endorphins which act like natural pain killers.  Then the body tend to be more relaxed as the stress level is reduced.