Fig. 2.

Illustrations of the regions of interest and results. (a) ROI location. The blue ROI is centred on co-ordinates [−54, +6, −26] from Rogers et al. (2006); the red ROI is centred on co-ordinates [−53, +4, −32] from Pobric et al. (2006). Each ROI is a sphere with 6mm radius. (b) The same ROIs are shown as open circles on the temporal signal to noise ratio (tSNR) map to illustrate that our fMRI acquisition protocols produced good LATL signal. (c)Left hemisphere activation for object naming (ON) relative to matching semantically related stimuli (SR), thresholded at p<0.05 uncorrected, after removing activation that is shared by both semantic conditions. Activation shown in blue is for ON>SR. Activation shown in red is the reverse (SR>ON). The location of LATL activation is highlighted within a white square. (d) Relative activation for each condition in each sub-region at the peak co-ordinates from ON>SR in the Rogers sub-region (left) and SR>SU in the Pobric sub-region (right). The height of the bars is the mean effect across subjects in arbitrary units, with 0 corresponding to fixation. Green bars denote visual stimuli, purple bars auditory stimuli. [ON=Object Naming, SU=Semantically Unrelated trials on the Semantic association task, SR=Semantically Related trials on the Semantic association task, Se=Sentence production, Vb=verb naming]. (e) A plot showing how intersubject variability in the effect size for object naming dissociates in the two regions. Blue is the response at the Rogers peak coordinate [−51, +9, −24], red is the response at the Pobric peak coordinate [−48, +3, −33]. Subjects are ordered by the strength of their response in the Rogers region (blue). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)