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).
Earthquake waves travel through the Earth in all directions from the focus. The waves moving away from the point where the rocks ruptured cause rock particles to expand and contract like the slinky in the picture. This type of earthquake wave causes rocks to compress and expand as the waves move through all parts of the Earth. Recording seismic waves. Primary waves, are the first to arrive at recording stations. S waves, also produced by all earthquakes arrive a short time after at recording stations.