| A device for attention promotion and a system of a task capable of promoting attention are provided herein. The device for attention promotion includes a unit of frequency generation for providing plural first specific frequency signals which at least include frequencies of 12Hz, 14Hz, 19Hz, 20~22Hz, 22Hz and 38~40 Hz; a processing and controlling unit which receives the plural frequency signals and generates plural visual control instructions according to the plural frequency signals; and plural visual mediums electrically coupled to the processing and controlling unit and emitting visible light in those frequencies in response to the visual control instructions. |