Fig 1.
(A) Hierarchical stimuli with two levels (local and global). Example of target and non-target stimuli for each condition. (B) Example of target-present Global-0D (left panel), and Local-5D (right panel) trials. (C) Simplified design of one fMRI scan. Each block lasted approximately 30 sec. The order of the blocks was pseudo-randomized between subjects and between runs, with a total of 10 blocks within a run. Each functional scan started and ended with a 10-sec rest.
Fig 2.
Response times in milliseconds by target level and number of distractors in present-target trials, in each age group.
Fig 3.
Activation underlying the local and global processing, across all participants.
Activations are presented in a radiological view. R; Right, L: Left Hemisphere.
Fig 4.
Between-group differences in occipital activation for the L-5D, G-5D and L-0D conditions.
There was no significant difference for the G-0D condition between the two age groups. All activations overlapped and were greater for the L-5D for the young adults than for the older adults.