highly significantp = 0.004
A comparison of GABAergic cell number between young monkeys and aged animals classified on the basis of DR and DNMS task performance revealed a highly significant group effect in the full basal forebrain as well as for the rostral and caudal divisions (one-way ANOVA; DR task main group effects, BF: F (2,19) = 7.581, p = 0.004; rostral division: F (2,19) = 4.726, p = 0.022; caudal division: F (2,19) = 3.848, p = 0.040; DNMS task main group effects, BF: F (2,19) = 8.121, p = 0.003; rostral division: F (2,19) = 5.062, p = 0.017; caudal division: F (2,19) = 4.017, p = 0.035; Fig. 8 B , C ).