Using neutron spin echo (NSE) spectroscopy and a labeling scheme unique to neutron scattering the motion of it labeled branch point of a three-arm polyethylene star has been observed oil a molecular level. The measured dynamic structure factor shows a clear transition to a Plateau, Signifying the stronger confinement of the star center in comparison to a corresponding center labeled linear chain. A shortening of one star arm to about only one entanglement length leads to the same topological confinement as for the symmetric star within the accessible time range of NSE. This reflects it stronger effect of such it small branch than expected and is consistent with rheological measurements on the same system.