From experiments done with adults, we have known for a while that there are different brain signals when the feedback says "Correct" compared to the feedback that says "Oops! Made a mistake". Before telling you more about it, we will explain how you can measure such brain responses:
Your brain does anything and everything that it does by passing very, very, very tiny bits of electricity between different brain cells called neurons. This electricity allows the neurons to communicate with each other and send information across the brain. Neuroscientists, the people who study brains, know how to measure these tiny currents using a technique called electroencephalography (Electro-En-ce-pha-lo-Gra-phy), usually shortened to EEG. They take a lot of extremely sensitive wires, called electrodes, and arrange them on a cap. The neuroscientists can see and measure the tiny brain signals when the cap is placed on a person's head. This helps the neuroscientists observe the changes happening to your brain signals when you get feedback.

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