It requires only a change in consciousness, and that can be any one of a number of symptoms, including feeling foggy, feeling dizzy, hearing a ringing in your ear, being more impulsive or hostile than usual.
它只需要意识的变化， 可以是如下的症状， 包括感觉模糊，眩晕， 耳朵里有响声， 比平常更冲动或具有敌意。