I am by imprinting a physical scientist. That's what my undergraduate days as a physics major at Stanford did to me. That, plus a father who was a Professor of Radiology at Stanford Medical School and who idolized the physical sciences. With sometimes immense historical delay, these mechanisms always move towards being grounded in the larger mechanistic view of the universe.
Theories always propose a view of how the universe is.
They can never be effectively argued to be true, but only be brought before the bar of empirical evidence. All the modern concern for contextualism, hermeneutics and the social determination of meaning has its point, but is a mere footnote to the massive evidence for this view of science. The overwhelming success within this framework of modern biology over the last half century has provided another major confirmation, if one is needed. Someday we will get another striking confirmation from cognitive science. Though it can be argued that we are well on our way, we still have an immense distance to go.