Possible signs of cognitive disorders and delirium include sudden personality changes, impaired thinking, or unusual anxiety or depression.

The word "cognition" is defined as "the act of knowing" or "knowledge." Cognitive skills therefore refer to those skills that make it possible for us to know.

In cancer patients, cognitive disorders and delirium may be due to the direct effects that cancer has on the brain

One of the first questions a parent will have is "Why? What went wrong?" "Did I do something to cause this?" There is little compelling evidence at this time that ADHD can arise purely from social factors or child-rearing methods.