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.
1 5.4 microseconds â the time taken by light to travel one mile in a vacuum. 2  10 microseconds (Î¼s) â cycle time for frequency 100 kHz, radio wavelength 3 km. 3  17 microseconds: net amount per year that the length of the day lengthens, largely due to tidal acceleration.