Table 2.

Region of interest analysis.

Region	repeat	novel	switch	repeat < novel	switch > novel	switch > repeat
Left intraparietal sulcus	3.71	3.68	3.81	−0.73	2.31*	1.95*
Right intraparietal sulcus	3.12	3.15	3.22	0.60	1.00	2.11*
Left FEF	2.90	2.90	2.98	0.01	2.39*	1.51
Right FEF	3.09	3.08	3.18	−0.25	1.97*	1.59
Left lateral occipital	2.16	2.20	2.23	1.01	0.48	2.15*
Anterior cingulate	1.90	1.89	1.98	−0.06	1.48	1.53
Right frontal gyrus	1.87	1.88	1.94	0.19	1.19	1.12
Right lateral occipital	0.74	0.71	0.72	−0.75	0.49	−0.29
Left frontal gyrus	1.71	1.67	1.74	−0.78	1.05	0.73

The locations of our a priori regions of interest were derived from Kristjánsson et al. (2007). Each row shows measures for a different region. The first column provides the name for the region, and the next three columns report the t-score for that region (the mean value for the 10% most active voxels in that region) for each of the three conditions repeat (rTnD + nTrD), novel (nTnD), and switch (sTnD + nTsD). The conditions repeat and switch are analogous to the conditions used by Kristjánsson et al., whereas the novel condition is designed to provide a form of baseline. The final three columns report the t-values (df = 20, where t = 1.725 is the one tailed p < 0.05, contrasts that survive this threshold are denoted with an asterisk) for three conditions: repeat > novel, switch > novel and switch > repeat. Note that the t-scores for the repeat and switch conditions are actually the mean t-scores from the rTnD and nTrD and sTnD and nTsD relative to rest, respectively. Significant positive t-values in the switch > repeat are replications of Kristjánsson et al., whereas the other contrasts allow us to determine if these effects reflect suppression or enhancement. FEF refers to “frontal eye fields” – the superior frontal sulcus).