“…Furthermore, there is evidence that both techniques can lead to increased levels of catecholamines (Rubia et al, 2021 ; Westwood, Radua, & Rubia, 2021a ), which are known to be abnormal in ADHD (Cortese et al, 2018 ). The “electroceutical theory” of neurostimulation suggests that nascent biochemicals (such as dopamine and noradrenaline) are enhanced by the electrical stimulation, which can alter the activity of communication between specific nerve fibers to achieve therapeutic effects, while the “augmentation theory” of neurostimulation suggests that therapeutic benefits arise from physicochemical means, such as changes to the transmembrane potentials, membrane permeability, or electroactivity of receptors or receptands, under the influence of the applied electric field (Camp et al, 2021 ). For both rTMS and tDCS it seems that the combination with cognitive training, which primes the areas to be stimulated with a cognitive task, is more effective than stimulation alone, due to the synergistic effects of functional targeting (Westwood, Criaud, et al, 2021b ; Westwood, Radua, & Rubia, 2021a ).…”