Emerging symptoms on the pathway to psychosis

The objective of this thesis was to increase our knowledge about emerging psychotic symptoms on the pathway to a first psychosis. To this end we investigated positive, negative and depressive symptom clusters and focused on the following aims:
Aim 1: Acquiring a better understanding of emerging positive psychotic symptoms by asking whether positive psychotic symptoms can be detected early and if this is useful clinically.
Aim 2: Acquiring better understanding of negative, depressive symptoms, on the pathway to first episode psychosis.
We tried to answer the following questions:
2a: What role do these two symptom clusters play on the pathway to a first episode psychosis?
2b: Can we distinguish these two symptom clusters from each other?