Facial expression responsible for controlling the expression differ in each case. Voluntary facial expressions are often socially conditioned and follow a cortical route in the brain. Conversely, involuntary facial expressions are believed to be innate and follow a subcortical route in the brain. Facial recognition is often an emotional experience for the brain and the amygdala is highly involved in the recognition process. The eyes are often viewed as important features of facial expressions. Aspects such as blinking rate can possibly be used to indicate whether a person is nervous or whether he or she is lying. Also, eye contact is considered
Emerging adulthood and early adulthood the ages of 18–25. Emerging adults have reached a stage of full hormonal maturity and are fully, physically equipped for sexual reproduction. Emerging adulthood is usually thought of as a time of peak physical health and performance as individuals are usually less susceptible to disease and more physically agile during this period than later stages of adulthood. However, emerging adults are generally more likely to contract sexually transmitted infections, as well as to adopt unhealthy behavioral patterns and lifestyle choices. While many people believe that the brains of emerging adults are fully developed, they are in fact still developing into