Activation was observed along the superior temporal sulcus, running from the ATL into the posterior temporal lobe and extending upward into the supramarginal gyrus
(BA40). In line with previous distortion-corrected fMRI studies, robust ventral temporal activation was also found in the fusiform and inferior temporal gyri. This began at y ≈ −45 and extended into the ATL, with a peak at y = −14 and an anterior extent of y ≈ 0. Bilateral occipital activation was also observed, reflecting the greater visual complexity of words relative to numbers. The effects of the stimulus manipulations in the IFG (pars triangularis peak), superior ATL (sATL) and ventral ATL (vATL) are displayed in Fig. 2A. The data from the these three ROIs were first analysed with a 2 × 2 × 3 repeated-measures ANOVA that included concreteness, cue type and region as factors. This analysis revealed interactions between region and concreteness Selleckchem Baf-A1 [F(2,36) = 4.52, p = .018] and region and cue type [F(2,36) = 8.51, p = .001]. This indicated that the effects of our experimental manipulations varied across regions;
we Angiogenesis inhibitor therefore performed a series of follow-up tests, controlling for multiple comparisons using the false discovery rate ( Benjamini & Hochberg, 1995). We first subjected each region to a 2 (concreteness) × 2 (cue type) ANOVA, the results are reported in Table 5. All three regions displayed stronger activation to abstract words but the regions diverged in their response 17-DMAG (Alvespimycin) HCl to cueing. IFG showed greater activation when judgements were made following irrelevant cues, consistent with a role in semantic control and selection. In contrast, sATL showed the reverse pattern, with significantly greater activation for judgements made following contextual cues. vATL showed an effect in the same direction as sATL but it was not significant in this region.
To determine whether effects differed significantly between pairs of regions, we conducted three pairwise comparisons using 2 × 2 × 2 ANOVAs. These confirmed that the effect of cue type in IFG was significantly different to that in each of the temporal regions [F(1,18) > 9.21, p < .007], indicating a dissociation in function. In addition, the A > C effect was significantly weaker in the vATL relative to the sATL [F(1,18) = 11.6, p = .003]. This within-temporal change in the concreteness effect was explored further in the next section. We assessed concreteness effects in an anterior section of each temporal gyrus, to test the prediction that there would be a graded shift in responses, with dorsolateral regions showing preferential activation for abstract words and ventromedial regions for concrete words. Fig. 2B shows the results. A one-way ANOVA confirmed that the effect of concreteness varied across the five gyri [F(4,72) = 6.25, p < .001]. The superior temporal gyrus displayed the strongest preference for abstract words.
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