ADHD theories still need to take more on board: Serotonin and pre-executive variability

Behavioral and Brain Sciences 28 (3):438-438 (2005)
Abstract
Correcting the relationship between tonic and burst firing modes in dopamine neurons may help normalise stimulus-reinforcement gradients and contingent behaviour in attention-deficit/hyperactivity disorder (ADHD) children. But appropriate evaluations of stimuli for developing adaptive plans and controlling impulsivity will not occur without moderating the gain-like functions of serotonin. The “dynamic theory” correctly highlights the need to account for variability in ADHD. The dysmaturation of pre-executive information processing is proposed as an explanation. At the core of the article by Sagvolden and colleagues there is a set of data that throws light on an aspect of the ADHD phenomenon. But one asks if the authors are a measure too brave to generalise so broadly from the unusually steep reinforcement gradients reported for the human condition and an animal model to the syndrome as a whole.
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