If I shine a light in only one of your eyes, making sure not to get any light in the other eye, both eyes would constrict their pupils.  Even if an eye does not receive stimulus, it can have a contralateral response.  Explain why

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Chapter6: The Peripheral Nervous System: Afferent Division; Special Senses
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If I shine a light in only one of your eyes, making sure not to get any light in the other eye, both eyes would constrict their pupils.  Even if an eye does not receive stimulus, it can have a contralateral response.  Explain why.

 
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