Three-second rule of human body

When photographers take pictures, they usually keep each picture close to 3 seconds or its multiple; In track and field competition, the time interval from issuing the "preparation" command to starting is about 3 seconds; The traffic lights change from yellow to red, with an interval of 3 seconds, so that the driver can brake calmly; The music of Mozart and Beethoven also follows the rhythm of three seconds, so it sounds sweet. ...

And many of our basic physiological activities, such as deep breathing and some functions of the nervous system, last for 3 seconds.

Psychologists have long speculated that the interval of three seconds may be the basic unit of human perception of life, and our perception of "this moment" often lasts for three seconds. This guess is called "the three-second rule" for short.