(Prenatal brain development: From conception to birth) About 4-8 weeks after conception, the two hemispheres of a human fetus' brain begin to emerge. These areas control complex behaviors, problem solving, and memories and are called the

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The cerebral cortex is the part of the brain that controls complex behaviors, problem solving, and memories. It begins to form about 4-8 weeks after conception. The hindbrain and cerebellum are involved in more basic functions such as movement and balance, while the pineal gland is responsible for producing melatonin and regulating sleep patterns.

(Prenatal Brain Development: from Conception to Birth) About 4-8 Weeks