Aneuroscientist asks a human participant to extend her leg at the knee. eeg recordings of the participant's brain activity should show increased activity from the scalp over the lobe.

The given blank can be filled with the frontal lobe.  

The frontal lobe is situated at the anterior of the brain and is the biggest of the four major lobes of the cerebral cortex in mammals. The frontal lobe is situated at the anterior of each cerebral hemisphere, that is, in front of the temporal lobe and the parietal lobe.  

The frontal lobe plays a huge function in voluntary movement. It accommodates the primary motor cortex that regulates the functions like walking.  

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.