英语词汇seeing stars的起源、历史背景-英语词源词典

seeing stars. This expression was probably used much earlier (there is a 1609 quotation that seems to imply its use), but it is first recorded in the 1891 Century Dictionary: “To see stars, to have a sensation as of flashes of light, produced by a sudden jarring of the head, as by a direct blow.” The phenomenon re- sults from a change in blood flow to the brain. According to neurologist Dr. C. Boyd Campbell: “Blood supplies nerve cells with oxygen, sugar, and other vital nutrients. Any loss of blood to the brain—easily caused by standing up, an action that forces blood away from the head—deprives the nerve cells of these nutrients. This causes a brief, random firing of neurons, which is interpreted by the brain’s visual cortex as quick flashes of light, or ‘stars.’ The phenomenon is also produced by a blow to the head or by stimulating the eye electrically, both of which al- ter the normal state of nerve cells.”

词汇	seeing stars
词源	seeing stars. This expression was probably used much earlier (there is a 1609 quotation that seems to imply its use), but it is first recorded in the 1891 Century Dictionary: “To see stars, to have a sensation as of flashes of light, produced by a sudden jarring of the head, as by a direct blow.” The phenomenon re- sults from a change in blood flow to the brain. According to neurologist Dr. C. Boyd Campbell: “Blood supplies nerve cells with oxygen, sugar, and other vital nutrients. Any loss of blood to the brain—easily caused by standing up, an action that forces blood away from the head—deprives the nerve cells of these nutrients. This causes a brief, random firing of neurons, which is interpreted by the brain’s visual cortex as quick flashes of light, or ‘stars.’ The phenomenon is also produced by a blow to the head or by stimulating the eye electrically, both of which al- ter the normal state of nerve cells.”
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