Description: This fileset contains the first levels and key contrast reported in Kievit, Scholte, Waldorp & Borsboom; 'Inter- and intra-individual differences in fluid reasoning show distinct cortical responses'. The main focus is on the contrast of difficulty and ability. The first levels here capture the dimension of difficulty using a regressor that captures the difficulty of 72 Raven's Matrix items. The raw behavioural data (used to derive ability estimates) can be found on Figshare, https://figshare.com/authors/Rogier_Kievit/571579
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