In folk psychology, we talk about beliefs. For instance, you can ask someone, why did you increase your investment in the stock market? He may say, well, I believe that the stock market will likely go up. He might even give you specific probability distributions (more granular belief) about different future stock returns.
However, from a "mechanical" standpoint, it seems to me that this "belief" --- if formed before the decision (investment) is made --- must be a form of memory. That is, the person may have done analyses earlier and somehow decided that the stock market is likely to go up, and that thought is stored as either long-term or short-term memory in his brain.
(Of course, it is also possible that his stated "belief" is an ex-post rationalization of his actions. In that case, it is not even a memory.)
Is what I am saying correct? Can there be "beliefs" (in folk psychology parlance) that are not just a specific type of memory?