The prefrontal cortex (PFC) is the anterior part of the frontal lobes of the brain, lying in front of the motor and premotor areas.This brain region has been implicated in planning complex cognitive behavior, personality expression, decision making, and moderating social behavior.o define the prefrontal cortex as the projection zone of the mediodorsal nucleus of the thalamus builds on the work of Rose and Woolsey who showed that this nucleus projects to anterior and ventral parts of the brain in nonprimates. Rose and Woolsey however termed this projection zone orbitofrontal..
Immediately above the Moho, the velocities of primary seismic waves (P-waves) are consistent with those through basalt (6.7â7.2 km/s), and below they are similar to those through peridotite or dunite (7.6â8.6 km/s).
  yes it does. the hydraulic radius increases downstream which decreases friction. also the river sides and bed are smoother due to faster erosion which allows the river t â¦ o flow faster. There are unlikely to be large obstuructions (such as boulders) in the river so the water has a clear path.n the upper course of a river, there is a V-shaped valley with a  steep gradient as the water is constantly using up the majority of  its energy to overcome friction. As a â¦ river flows downstream, the  valley becomes a U-shape and the gradient decreases.