A phenomenon that has been closely connected to the EMT mechanism concerns inhomogeneities or fluctuations of concentration occurring in the alkali metalammonia solutions in the intermediate range of 1-8 MPM. Experimental evidence for microscopic structural inhomogeneities was first provided by X-ray diffraction studies. Subsequently, large concentration fluctuations in lithium and sodium ammonia solutions were deduced from investigations of the dependence of the chemical potential on the alkali metal concentration. Finally, the nanometer-sized correlation lengths of the fluctuations were derived from small-angle neutron scattering studies. Based on these experimental studies, a model was proposed suggesting the coexistence of dilute and concentrated voids in the intermediate concentration regime, which accounted for the spatial dimensions of the inhomogeneities. However, no temporal information about these fluctuations has been provided so far, neither experimentally nor from modelling, making it hardly possible to deduce their molecular origins.