There is a lot of evidence to support the idea that our minds can affect our_____. Many of the health problems that people suffer, such as headaches, _____, and _____, may be related to psychosomatic disorders - that is, they may be caused by the _____. The field of psychoneuroimmunology (PNI) studies the way in which our minds can affect our _____. In a healthy person, the immune system protects the body against_____. Animals and human research has shown that stress-especially uncontrollable stress-can hurt the immune system. Robert Ader did an important study with rats in which he learned, quite by accident, that the rats'_____ could be conditioned to_____. This was an exciting discovery for science: if the immune system can be taught to_____, that probably means that it can also learn to_____.