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 microsecond is an SI unit of time equal to one millionth (0.000001 or 10â6 or 1/1,000,000) of a second. Its symbol is Î¼s. One microsecond is to one second as one second is to 11.574 days. A microsecond is equal to 1000 nanoseconds or 1/1,000 milliseconds. Because the next SI prefix is 1000 times larger, measurements of 10â5 and 10â4 seconds are typically expressed as tens or hundreds of microseconds.