To investigate changes in attentional control in the elderly, we used fMRI to examine patterns of neural activity during the color-word Stroop task. Elderly participants used a 3-button response pad to identify a word's ink color. They received 8 blocks of neutral trials (e.g., “late” in red ink) alternating with blocks composed of 50% neutral and 50% incongruent trials (“red” in blue ink), and blocks composed of 50% neutral and 50% congruent trials (“red” in red ink). We collected 400 EPI images (1.5T GE Signa scanner, TR=1517 ms, flip angle=90°, voxel size 3.75x3.75x7 mm). Regression analyses identified regions active 1) when there are two sources of color information (in the ink color & in the word) that must be disambiguated (as in congruent & incongruent trials) and 2) when there are conflicting sources of color information (as in incongruent trials). Consistent with our prior results in young adults (Banich et al., 1999, SFN Abstr. 865.3), regions activated when there are two sources of color informa...