| 摘要 |
PURPOSE:To monitor the metal condition of a worker to execute work by providing a computing element to calculate the time average of an average alpha-wave appearance rate in a person to be monitored from brain waves measured over a fixed time and a divider to calculate the frequency of alpha-wave appearance in a specified working time. CONSTITUTION:Brain waves 1 are taken in from an electrode 2 attached to a head part. A taken-in brain wave signal 3 is amplified by an amplifier 4 and analyzed to respective frequency components by a frequency analyzer. The respective analyzed brain wave signals are inputted to a band pass filter 6 and only an alpha-wave component is extracted. For this alpha-wave, for example, the average of the alpha-wave appearance ratio from the past to present in the worker is obtained by using a 1st time coverage value calculation I7 and defined as the average alpha wave appearance rate of the worker. When a ratio R of the alphawave appearance rate is almost equal with '1', and the alpha-wave appearance rate at the time of working is considered almost equal with the average alpha-wave appearance rate of the worker and it is decided that work execution ability is not especially lowered. When the R is lowered less than '1', it is decided that the worker is in an instable period. |
