When does the human fetus have brainwaves?
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From about the 4th week of gestation, roughly speaking. But not all brain activity is equal. The ability to respond to stimuli at this stage is comparable with that of a coma patient with a maximum score on the Glasgow coma scale. The very earliest foetal brain responses to sound (which is one of the first senses to develop alongside vital brainstem functions) is about 16 weeks. 1
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