their left-skew. For the CNB measure of nonverbal reasoning, a k−x transformation was performed on the PMAT-18B form of the task due to its left-skew, while a x transformation was performed on the PMAT-24A form of the task due to its right-skew. No transformations were performed on CNB measures of facial memory, finger tapping speed, and spatial reasoning. Neurocognitive phenotype scores were multiplied by −1, following data transformation and scaling, when needed so that higher scores always indicate better performance across the assessed tasks.
