Figure 4
The aging effect on the different parameters of the model. An aging effect greater than 1 for photon noise and late noise (i.e., mean of late noise) represents more noise for the older adults. An aging effect smaller than 1 for early noise represents less noise for the older adults and for tMTF it represents a tMTF that is less low-pass for the older adults. An aging effect greater than 1 for calculation efficiency represents older observers being less efficient than the young observers. The error bars represent a 95% confidence interval (± 1.96 \(\times\) the standard error of the difference) and the asterisks represent a significant aging effect \((p<0.05)\).
