Penelope is adding fractions while taking a math test. what part of her brain is at work? spinal cord cerebrum cerebellum hypothalamus

The right answer is Cerebrum

Researchers have analyzed the brain of volunteers using functional magnetic resonance imaging (fMRI). They observed that each time an individual tackles a task, he mobilizes the frontal lobes of both hemispheres, right and left, simultaneously - those brain regions at the front of the brain are actually involved in the reasoning and the completion of tasks. So, to perform a task, the two hemispheres communicate with each other.

On the other hand, as soon as the subjects try to perform two tasks at the same time, each hemisphere deals with one task and no longer communicates with the other. This sharing is still manageable: researchers have observed that a prefrontal zone is also activated in the brain, with the mission of memorizing the two tasks to be performed in order to perform them successively. It only takes a hundred milliseconds to switch from one task to another, in other words: it feels like you can do two things at once.

there’s no image attached but i can if you want: )