Abstract: The critical period hypothesis holds that first language acquisition must occur before cerebral lateralization is complete, at about the age of puberty. One prediction of this hypothesis is that second language acquisition will be relatively fast, successful, and qualitatively similar to first language only if it occurs before the age of puberty.

Considering the cognitive and linguistic complexity of discourse production, it is expected that individuals with traumatic brain injury (TBI) should face difficulties in this task. Therefore, clinical examination of discourse has become a useful tool for studying and assessment of communication skills of people suffering from TBI.

Parents teach their children to lie. The teaching process is subtle but just as effective as if they had sent their children to formal classes in deception. How many times have parents told their kids "Look me in the eye and then tell me what you did?"

Believe it or not, the Internet did not give rise to procrastination. People have struggled with habitual hesitation going back to ancient civilizations. The Greek poet Hesiod, writing around 800 B.C., cautioned not to "put your work off till tomorrow and the day after." The Roman consul Cicero called procrastination "hateful" in the conduct of affairs.

Research has shown that when a teacher explains a homework assignment to a student, the student who postpones their work tends to suffer physical or mental illness later on. APS Fellow Dianne Tice and APS William James Fellow Roy Baumeister, then at Case Western Reserve University, rated college students on an established scale of procrastination, then tracked their academic performance, stress, and general health throughout the semester. "Procrastinators earned lower grades than other students and reported higher cumulative amounts of stress and illness."