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
Facial tissue and its use. Facial tissue and paper handkerchiefs are made from the lowest basis weights tissue paper (14 18 g/m). The surface is often made smoother by light calendering. These paper types consist usually of 2–3 plies. Because of high quality requirements the base tissue is normally made entirely from pure chemical pulp, but might contain added selected recycled fiber. The tissue paper might be treated with softeners, lotions or added perfume to get the right properties or "feeling". The finished facial tissues or handkerchiefs are folded and put in pocket-size packages or a box dispenser. Facial tissue has been