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 density of the wave will be the lowest just past downstream of the wave. So, if the wave is moving from left to right (making the right side downstream), then just past the right side of the wave will have the lowest density. A compression wave occurs when there's a lot of pressure build up. Think of air flowing through an air duct. All of a sudden, the duct gets smaller, making this compression form a wave. The downstream side of the wave will have the lowest density because the waves themselves will be farther apart. Report