To explore the ability of the "effective concentration" model to quantitatively predict the individual local dynamics of each component in miscible polymer blends, three model systems [polystyrene/ poly(vinyl methyl ether), polystyrene/poly(o-chlorostyrene) and poly(vinyl methyl ether)/poly(o-chlorostyrene)] are studied using differential scanning calorimetry and thermally stimulated depolarization current, this second technique allowing to measure the effective T-g of the dielectrically active component in the blend. Final results show a very good agreement between measured effective glass transition temperatures and those predicted by the model.