Participation ratios below ~0.1 are typical for localized modes that do not contribute to thermal transport, and the localization limit is, by definition, when only 1 atom (out of all the atoms in the unit cell) participates in the vibrational mode. The calculated participation ratios are in the intermediate range, comparable to those of amorphous materials like a-C and a-SiO2 , despite the crystalline nature of Ag8GeSe6. While the participation ratio cannot clearly separate phonons and diffusons, the similarity to the results of amorphous materials strongly indicates the presence of diffuson-like vibrations complementary to the two-channel model. Again, this indicates that Ag + vibrations in particular are predominantly diffuson-like.