Figure 1.

Stimuli and imaging paradigm for spIMG runs: (a) 4×4 lettered matrix; (b) example 4-trial spIMG block showing letter strings and imagined shapes for ‘same’ and ‘different’ trials; (c) letter strings for the word/non-word task (a “same” response was required if both strings represented the same category (word or non-word); (d) each run contained interleaved spIMG and WnW blocks (see text for details).