Differences

• ADD (attention deficit disorder) and ADHD (attention deficit hyperactivity disorder) by 2010 were classified as the same disorder. ADD was formerly used as a term to identify attention deficit disorder without hyperactivity, and ADHD with hyperactivity. Now the official broader term for all types is ADHD, with subtypes, such as Limbic ADHD.
  
  

Limbic

• The limbic system of the brain includes the amygdala, the hippocampus, the parahippocal gyrus, the cingulate gyrus, the fornix and the hypothalamus and the thalamus. Together, these function in the role of memory and signaling to other parts of the brain, long-term memory, heart rate, blood pressure, cognitive and attentional processing, hunger, thirst, sexual arousal, emotion, motivation and drive.
  
  

Gender

• About twice as many boys as girls have ADHD in general, and it is more often the type with hyperactivity. Girls more frequently are diagnosed with ADHD combined with depression, and this is often classified as Limbic ADHD or Limbic ADD. The most common ages for an ADHD diagnosis is 10 and 11. However, all types of ADD or ADHD can be diagnosed at any age.