ImPACT is the most-widely used and most scientifically validated computerized concussion evaluation system. Many teams and organizations around the world trust ImPACT for concussion management. An estimated 4 to 5 million concussions occur annually, with increases emerging among middle school athletes.
Horizontal logarithmic scale marked with units of time. A millisecond (from milli-and second; symbol: ms) is a thousandth (0.001 or 10 â3 or 1 / 1,000) of a second. 10 milliseconds (a hundredth of a second) are called a centisecond. 100 milliseconds (one tenth of a second) are called a decisecond. To help compare orders of magnitude of different times, this page lists times between 10â3 seconds and 10 0 seconds (1 milli second and one second). See also times of other orders of magnitude.
A nanosecond (ns) is an SI unit of time equal to one billionth of a second (10â9 or 1/1,000,000,000 s). One nanosecond is to one second as one second is to 31.71 years. (Actually the correct answer [per leap years calculation] is one second is to 31.69 years, because there are 365.2422 days in a solar year). The word nanosecond is formed by the prefix nano and the unit second.