Shinkan

 Shinkan (神感, Shinkan) is a unique seal where the Uzushiokage Shenron Uzumaki applies the properties of Yin Release and Yang Release to increase the ability to perceive something as well as the ability to react faster.

Overview
After creating the Yin-Yang Seal: Release, Shenron became interested in the human body and its many wonders. Shenron was curious in how the human body perceives things, and how it reacts to the things it perceives. Then the young kage got a brilliant idea. Similar to sharingan, He would apply the properties of Yin to be able to increase the rate at which he perceives, increasing his sharingan abilities predictability as well and use the properties of Yang to increase his ability to react, having his electrical signals that are in his nervous systems emit at a faster rate. With this technique used in synch with his Sharingan, Shenron can even see techniques that move at instantaneous speeds, seem to get slower, and with the Yang accelerating the rate at which the electrical signal are sent from 150 meter per second to 3700 meters per second, the body even has a chance to react an instantaneous movement. Combined with lucky natural instinct this is considered the pinnacle of perception.