What are the differences between concurrency computational models and concurrency patterns?

Concurrent computational models includes actor model, CSP, Petri nets, etc.

Concurrency patterns includes active objects, barrier, reactor, monitor, scheduler, etc

What are the differences (and also maybe relations) between concurrency computational models and concurrency patterns?

It is interesting to notice that wikipedia's Design Patterns patterns template lists "Actor model" under concurrency patterns. That makes me even more unsure about the question I asked above.

Thanks.