Figure 1.
Experiment 1. a, Example stimulus sequence. Successive frames flashed on (100 ms) and off (200 ms) in a continuous sequence. Periodically (see Materials and Methods), either the black or the white word changed identity, and then continued to flash on and off as before. b, Whole-brain contrast of attended-change minus unattended-change events (random effects, p < 0.05, corrected for multiple comparisons using false detection rate). Bar charts surrounding the brain figures depict the separate activation, relative to no-change events, associated with attended (blue) and unattended (red) change events. Activations in bar charts are means within spherical ROIs (10 mm radius) surrounding the peaks generated by the attended-change minus unattended-change contrast, and are presented as SPM contrast of parameter estimates (in arbitrary units). Medial and subcortical activations are not shown. A whole-brain contrast of attended-change minus no-change events gave essentially similar results to the contrast of attended-change minus unattended-change events.