00:03
So certain psychiatric disorders, particularly schizophrenia, are characterized by clusters of symptoms known as positive or negative symptoms.
00:15
So a positive symptom is when something is there that should not be.
00:22
That's going to be things like hallucinations because the person is experiencing something that is not there.
00:31
They are adding something in.
00:35
Other examples can be delusions where they're adding in a belief that is not reasonably there.
00:47
For instance, delusions of grandeur or delusions of persecution.
00:53
If there's no evidence of that being true, then they are adding that in when it should not be there.
00:58
Negative symptoms are when something should be present normally, but it's not in the person with schizophrenia.
01:07
For instance, flat affect.
01:10
Usually people should have a broad range of affect because this is how we display our emotions.
01:20
But when the person has flat affect, they don't...