Motivic invariants of quivers via dimensional reduction

We provide a reduction formula for the motivic Donaldson-Thomas invariants associated to a quiver with superpotential. The method is valid provided the superpotential has a linear factor, it allows us to compute virtual motives in terms of ordinary motivic classes of simpler quiver varieties. We outline an application, giving explicit formulas for the motivic Donaldson-Thomas invariants of the orbifolds $[\text{CC}\times {\text{CC}}^2\mathrm{/}{\text{ZZ}}_n]$.