10.6084/m9.figshare.9958622.v1 Gabriele Chierchia Gabriele Chierchia Delia Fuhrmann Delia Fuhrmann Lisa J. Knoll Lisa J. Knoll Blanca Piera Pi-Sunyer Blanca Piera Pi-Sunyer Ashok L. Sakhardande Ashok L. Sakhardande Sarah-Jayne Blakemore Sarah-Jayne Blakemore Supplementary Material from The matrix reasoning item bank (MaRs-IB): novel, open-access abstract reasoning items for adolescents and adults The Royal Society 2019 non-verbal reasoning adolescence speed–accuracy trade-off matrix reasoning 2019-10-09 08:38:59 Journal contribution https://rs.figshare.com/articles/journal_contribution/Supplementary_Material_from_The_matrix_reasoning_item_bank_MaRs-IB_novel_open-access_abstract_reasoning_items_for_adolescents_and_adults/9958622 Existing non-verbal ability tests are typically protected by copyright, preventing them from being freely adapted or computerized. Working towards an open science framework, we provide 80 novel, open-access abstract reasoning items, an online implementation and item-level data from 659 participants aged between 11 and 33 years: the matrix reasoning item bank (MaRs-IB). Each MaRs-IB item consists of an incomplete matrix containing abstract shapes. Participants complete matrices by identifying relationships between the shapes. Our data demonstrate age differences in non-verbal reasoning accuracy, which increased during adolescence and stabilized in early adulthood. There was a slight linear increase in response times with age, resulting in a peak in efficiency (i.e. a measure combining speed and accuracy) in late adolescence. Overall, the data suggest that the MaRs-IB is sensitive to developmental differences in reasoning accuracy. Further psychometric validation is recommended.