Why do people move so fast when taking pictures with digital cameras?

The speed of film and television is 25 frames per second. The automatic camera will automatically adjust the shutter speed and aperture value in different lighting spaces, and the speed of capturing and scanning is about 20-200 frames per second. What you see on the display screen will be the effect when the camera and TV are out of sync. When the shutter speed of the camera is higher than that of TV scanning, you will see a normal picture. If not, you can see from the camera screen that the picture on the TV screen is half up and half down or one picture at a time.