Objective: To compare blood perfusion in brain areas, as measured by SPECT, between diagnoses of ADHD combined type (ADHD-C) to ADHD inattentive type (ADHD-I). Method: Participants were part of a large de-identified clinical database that received SPECT scans of various brain regions. Using ADHD diagnoses, participants (73% male, Mage = 11.91, SD = 3.50) were determined based on inattentive (n = 1042) or combined type (n = 1185). Cerebral blood perfusion for each participant was assessed using SPECT during a concentration task (Conners’ CPT) within 17 brain areas. Results: A MANOVA conducted at α = .05, yielded significant differences in blood perfusion between a diagnosis of ADHD-C and ADHD-I, Wilks’ λ = .947. Participants diagnosed with ADHD-C yielded significantly higher blood perfusion in the limbic system, left basal ganglia, parietal lobes, motor-sensory cortex, and yielded significantly lower blood flow in the cerebellum, frontal lobes, occipital lobes, and right temporal lobe...

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