prefrontal cortex

US /ˌpriːˈfrʌn.təl ˈkɔːr.teks/
UK /ˌpriːˈfrʌn.təl ˈkɔːr.teks/
"prefrontal cortex" picture
1.

the part of the brain located at the very front of the frontal lobe, involved in complex cognitive behavior, personality expression, decision making, and moderating social behavior

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Damage to the prefrontal cortex can affect a person's ability to make sound decisions.
The development of the prefrontal cortex continues into early adulthood.