Spindle rate correlates with task performance. Spindle rate versus performance in four tasks: (A) full scale IQ (FSIQ), (B) motor dexterity (measured by the GPT), (C) processing speed (measured by the PSI), and (D) phonological awareness. Orange (green) circles represent CECTS (control) subjects. Black solid (dashed) lines indicate significant model fits (95% CIs). Gray solid (dashed) lines indicate models with insignificant fits (95% CIs).