Cognitive functions are anything that involves a person’s memory, perception, reasoning and overall thinking skills.
Someone with depression may find that they have problems with their short-term memory and that they are unable to focus in the way that they used to. This may mean that they are unable to make decisions and their levels of concentration are drastically reduced. This can affect their ability to carry out their job role but can also mean that they are unable to focus their attention on other activities, such as watching TV or reading a book.
For some individuals, the cognitive effects of depression are more serious and can cause them to have hallucinations; this is more common in psychotic depression, as we saw in an earlier section.