Polymyalgia rheumatica is a rare inflammatory disease characterized by muscle pain (myalgia), stiffness, and additional generalized systemic symptoms such as fatigue, low-grade fever, and/or a general feeling of ill health (malaise).olymyalgia rheumatica is closely related to giant cell arteritis, another inflammatory disorder. Giant cell arteritis is characterized by progressive inflammation of many arteries of the body. These two disorders have been described in the medical literature as possible variants of the same disease process.
Answer Wiki. , PhD student in behavioural neuroscience at Brown University. There are two types of associative learning: classical (Pavlovian) conditioning and instrumental conditioning (sometimes used interchangeably albeit incorrectly with operant conditioning).
Casually put, associative learning occurs not because two events co-occur but because that co-occurrence is unanticipated on the basis of current associative strength. The Rescorla-Wagner model attempts to capture that casual idea in a more formal way.