According to When a fetus hear , When a baby can hear in the womb and several other similar articles at week 18th a baby starts to hear sound. And according to How hearing works. Hearing involves

nerves communicate to the brain. The hearing nerve then sends the information to the brain with electrical impulses, where they are interpreted as sound.

Does this actually mean a brain is actually processing auditory signals at 18 weeks of human development, or at 18 weeks it's actually some process which somehow doesnt involve the brain processing information? Perhaps the conclusion might seem obvious for some , but not for me considering the supposed inability of the brain to process several others (or any other?) kind of signals at that stage, such as pain At what stage is the nervous system developed enough to interpret neuronal signals as 'pain'? and being the hearing experience directly connected to pain sometimes.

  • $\begingroup$ The ear is innervated at 18 weeks, if I recall. There is some evidence of varying quality looking at the response to acoustic stimulation, but good evidence of demonstrating cortical processing puts it much later... i think third trimester. I'd have to do some digging to find this though. A quick search didn't yield anything. $\endgroup$ – De Novo Oct 24 '18 at 5:20

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