Regions of significant activity for the combined task relative to both single feature tasks; independent of load, and interacting with load.

List of significant clusters for the following comparisons: i) Combined < > average (Picture + Position) averaged across Low and Medium loads and ii) Combined < > average (Picture + Position) x (Medium > Low). No significant activity was observed for Combined > average (Picture + Position) at retrieval or for the reverse contrast: Combined < average (Picture + Position) at any trial phase. A significant task x load interaction was observed at the retrieval phase for {Combined < (Picture + Position)} x (Medium > Low); no significant activity was observed for the reverse interaction contrast: {Combined > (Picture + Position)} x (Medium > Low) at retrieval. Standardized Montreal Neurological Institute (MNI) co-ordinates represent peak maxima of significant clusters (family-wise error (FWE)-corrected threshold). Approximate Brodmann areas are listed. *Hippocampus cluster was significant upon ROI analysis. Threshold was applied voxel-wise (FWE-corrected) to the region identified with a bilateral hippocampal mask defined using Wake Forest University Pick Atlas.