Question

Can somebody explain what exactly a neurological disorder is?

Specifically what causes them and what goes wrong in the brain?

Answer 1

A disorder is when there is something wrong with the brain.

Explanation:

In most cases it is due to damage to certain parts of the brain, but it can also be because of low activity in those brain parts.

For instance...
If you have damage or low activity in your Prefrontal Cortex (The front of the brain), you may get personality disorders. You may also become more impulsive (acting without thinking first).

Some people are born with disorders, and some get it later in life due to trauma, physical or mental.