GSTM1 and attention deficit-hyperactivity disorder: Weber et al. examined 11 child patients with ADHD and nine healthy age‐ and sex‐matched controls and found lateralized oxygen consumption in the left PFC of normal controls during an extended‐attention task, whereas boys with ADHD showed an imbalance between oxy‐Hb and deoxy‐Hb during the short‐ and extended‐attention tasks.59