Double dissociation between familiarity and recollection in Parkinson's disease as a function of encoding tasks

▶ Recollection is impaired but familiarity is intact in PD under deep directed encoding. ▶ Familiarity is reduced in PD under shallow non-directed encoding but not recollection. ▶ Deep encoding improved recollection in controls and familiarity in PD patients. ▶ Memory deficits in PD involve poor instantiation of strategies and impaired recollection.