Integration of size modifier. The top two rows of the matrix indicate the rule: “the object in the right column is the result of combining size indicated in the column and the object indicated in the row” (solution: the square in the fifth cell).  
  Part of: Vyshedskiy A, Dunn R, Piryatinsky I (2017) Neurobiological mechanisms for nonverbal IQ tests: implications for instruction of nonverbal children with autism. Research Ideas and Outcomes 3: e13239. https://doi.org/10.3897/rio.3.e13239