Message type indicator (MTI) — Four numeric digits that specify the version of the ISO8583 standard, message class, message function, and message origin.
To assess the effects on mental function, the participants were asked to do certain paper-and-pencil tests, such as crossing off specific digits on a page of Numbers as quickly as possible.
评估对于智力功能的影响，参与者被要求做一些纸笔测试，例如尽可能快的去除数字页面上某些特殊的数字。
3
The function that allows the elimination in the result of the calculation of all digits beyond the least significant digit.