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qwertyuiiop145 t1_j9a0r8h wrote

We all have different bodies and brains. Differences in vocal cords, tongue, teeth, and lungs can affect speech, but the brain is the main part. The brain is why lots of people can do foreign accents or impressions but still have a natural speaking pattern separate from those. We pick up our unique way of speaking as children as we learn to talk. Baby babble mostly sounds the same, but by the time kids speak in full sentences they have a much more individual voice. As they grow, kids pick up expressions, vocabulary, and vocal quirks that further separates each kid from their peers.

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beef-o-lipso t1_j9aanr3 wrote

Replying to Forackol (#1,882,903)

That would be a stretch. It's more nature and nurture. Your physical characteristics will impact tonality and what not. You're upbringing will impact cadence, pronouncation, and other influences. Finally, your brain will make its own choices combining all this input into your own voice.

You can consciously influence some parts like pronouncation and accent if you work at it.

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Recipe-Jaded t1_j9aasgn wrote

Replying to Forackol (#1,882,903)

well that and the structure of your respiratory system and shape of your nose and mouth. The slight differences in skeletal structure changes the length, width, diameter, etc. of muscles and tissues that are responsible for speech, making each person have a unique sound

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notenoughroomtofitmy t1_j9ikpld wrote

Replying to qwertyuiiop145 (#1,882,286)

Also,

We have different everything. Voices (like faces) are noticeable because we use them as a primary means for communication within our group, and our brains have evolved to zone in on the differences nonchalantly because it was a matter of life and death back then. Nothing about two people is exactly the same, things may be very similar. Most of these things go unnoticed, since they didn’t play as significant a role in our evolutionary history.

I imagine a dog asking on doggedit: “why do humans all have different smell?”

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