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).
The upper boundary that separates the upper mantle of the Earth's crust is defined by sudden increase in seismic velocity (which was first noted by Andrija Mohorovichich in 1909) - it is the Moho discontinuity (Moho). Moho is located at a depth of 5 to 70 kilometers from the Earth's surface.arth's upper mantle is a highly viscous layer, with a capacity up to 600 kilometers, which lies between the crust and lower mantle of the Earth.