All information that reaches your brain is filtered and sorted at several levels before you even become aware of it. The filtering of the data differs depends on whether or not you have ADHD.
A person's temperament refers to their fundamental traits. According to PSI personality theory, ADHD might just be a very pronounced form of a person's temperament.
ADHD is generally described as an attention deficit. However, individuals with ADHD may even demonstrate an impressive ability to focus on a single activity for an extended period.