Figure 4.

Left inferior frontal gyrus contributions to encoding. A, A contrast of change > repeat trials revealed clusters of activation within three anatomically defined left inferior frontal gyrus ROIs: pars opercularis (pars oper.), pars triangularis (pars triang.), and pars orbitalis (pars orbit.) (p < 0.001, 5 voxel extent threshold). B, Left, Activity in the left inferior frontal gyrus ROIs during the encoding of between-category change trials was predictive of subsequent target–competitor reactivation at retrieval, as reflected by positive β-values. Right, Activity in pars triangularis was uniquely predictive of gradations in subsequent target–competitor reactivation when only considering trials that were subsequently remembered. C, Direct comparison of the whole-brain contrast of change versus repeat encoding trials (p < 0.001; see Table 2) and the analysis of subsequent target–competitor reactivation (p < 0.001; see Table 3) revealed a single area of overlap in frontal cortex: left inferior frontal gyrus (pars triangularis and pars opercularis). Error bars reflect standard error of the mean.