Full Idea
The causal theory of perceptions says that to perceive an object is to have a sense-datum caused by that object; it is not enough for the world to be the way we perceive it; the world must cause the perception.
Gist of Idea
Causal theory says true perceptions must be caused by the object perceived
Source
Bernecker / Dretske (Knowledge:Readings in Cont.Epist [2000], Pt.V Int)
Book Reference
'Knowledge: readings in contemp epistemology', ed/tr. Bernecker/Dretske [OUP 2000], p.433
A Reaction
All causal theories seem dubious to me; what causes something is not the same was what it means, or refers to, or what justifies it. The hallmark of successful perception is truth. I would perceive a tree if God planted the perception in me.
Related Idea
Idea 12478 A 'quality' is a power to produce an idea in our minds [Locke]