While I don't have source for his claim, I actually have a source for something contrary.
There are two neurotransmitters mostly involved in ADHD, dopamine and norepinephrine, low levels or reduced sensitivity to them result in ADHD or similar conditions. These two neurotransmitters work synergistically, this is why ADHD is usually medicated with stimulants that rise both dopamine and norepinephrine levels in the brain and not with NRIs alone. Having low dopamine and high norepinephrine is very unusual. According to Talanov, Ne types may have reduced dopamine sensitivity, he concluded it from his research about sexuality in socionic types.
Translated from Russian, should be clear enough:
"Black sensorics and, to a lesser extent, black ethics are thus responsible for libido (in contrast, BI and BL reduce libido). Orgasmic strength has roughly the same profile as libido strength, but the main negative influence goes from white logic to black intuition - this can be explained by a deficit of dopaminergic sensitivity in black intuitives. Firstly, there is a lot of known evidence pointing to a direct connection between individual expression of BI and a decrease in the sensitivity of type 2 dopamine receptors in relay thalamic neurons (which leads in black intuitives to a decrease in the quality of sensory filters and, accordingly, to an expansion of the associative field), and at the same time, it is known that before orgasm an additional release of dopamine into the CNS occurs, that is, dopaminergic transmission is necessary for testing a full orgasm (dopamine is called a pleasure mediator for good reason)."
Source: http://sociotoday.narod.ru/sex.html