There are all kinds of suckers: soft suckers, hard, rapid and slow. When they suck hard, they get to hear a sound, and when they're aroused they suck hard.
Athena Vouloumanos
It was very shocking. I thought for sure that they would prefer the human speech. I kept testing more babies because I couldn't believe it.
human thought speech babies testing
sound hard hear
If these babies spent the first three months with rhesus monkeys, maybe they'd prefer monkey calls.
babies monkeys
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