Autonomous sensory meridian response (ASMR), sometimes also called "auto sensory meridian response"- a tingling sensation that usually begins on the scalp and moves down the back of the neck and upper spine. A pleasant form of paresthesia, it has been compared with auditory-tactile synesthesia and may overlap with frisson.
(Autonomous sensory meridian response) is a relaxing, often sedative sensation that begins on the scalp and moves down the body. Also known as "brain massage," it's triggered by placid sights and sounds such as whispers, accents, and crackles.
A short version of it is chills down your back from a slow sound or movement. People listen to ASMR to be able to calm down and fall asleep. Some make videos of doing ASMR for people to listen to it. It helps stimulate the brain and calm it down