I think what's sometimes called a "compartment" would be better called a "cluster". Learning consists of forming connections, which can naturally form distinct clusters without "barriers" causally separating them. The solution is then to simply connect the clusters (realize that the moon landing videos are relevant).

But certainly at times people erect intentional barriers to prevent connections from forming (a lawyer effortfully trying not to connect his own morals to the case), and then I would use the term "compartment". Identifying the distinction between clusters and compartments could be a useful diagnostic goal.