 This cause-law principle was also initially assumed without argument by Davidson, though we shall see below  (3.2)  how he later came to try to justify it. Now, the assumptions so far seem to point directly to the existence of strict psychophysical laws—if some particular mental event m1 is caused by some particular physical event p1, then, given the cause-law principle, it seems to follow that there must be a strict law of the form ‘P1 → M1’. That is, whenever events of kind P1 occur, events of kind M1 must follow. However, Davidson then claims that there can be no such laws. He calls this the Principle of the Anomalism of the Mental, and it holds that mental properties are not suitable for inclusion in strict laws of any kind; we shall call it the anomalism principle: