P1: My opinions change as a result of brain function
P2: Brain function is caused by opinions stored within it (slightly dodgy premise but if you wouldn't mind assuming it to be true, whether it is true or false has no bearing to my question rather this is just an example)
C1: Changing of my opinions is caused by brain function which is caused by my opinions
In this example, the fallacious implication is that changing of opinions is a circular process. However, this is clearly not true and is a logical jump, as we are only talking about specific opinions and specific brain processes, however we are INCLUDING all of them in the idea of this being circular. We are not attributing any properties of a set to the set itself, and for that reason I do not think this can be included in the Fallacy of Composition. What is, then, the term for this fallacy?