Fig. 2.
(a) Scatter plot demonstrating the positive relationship between perceptual and memory metacognitive efficiency in the subset of subjects who completed both tasks (r = 0.40, p = 0.02; N = 32). Two outliers are highlighted in grey . The dotted trend line indicates the relationship when outliers are removed (r = 0.25, p = 0.19; n = 30). (b) Scatter plot demonstrating the negative relationship between perceptual metacognitive efficiency and age (r = −0.38, p = 0.005). (c) Individual components of metacognitive efficiency (d′, meta-d′) plotted as a function of age. A combined increase in d′ and decrease in meta-d′ led to the overall decrease in efficiency shown in panel (b).