TY - JOUR A1 - Baltes, Paul B. A1 - Kliegl, Reinhold T1 - Further testing of limits of cognitive plasticity : negative age differences in a mnemonic skill are robust Y1 - 1992 SN - 0012-1649 ER - TY - JOUR A1 - Lindenberger, Ulman A1 - Kliegl, Reinhold A1 - Baltes, Paul B. T1 - Professional expertise does not eliminate negative age differences in imagery-based memory performance during adulthood Y1 - 1992 ER -