Described herein, in certain embodiments, are devices and methods for modulating the electrical activity of a brain in a targeted manner using a weak magnetic field, generally field with a strength of less than about 150 micro-Tesla. The magnetic field is varied over time in a periodic manner, generally with a frequency tuned to specifically affect the intrinsic frequencies of the brain. The "Low Field Magnetic Stimulation" devices and methods described herein modulate the electrical activity of a brain without requiring medication. Methods and devices described herein gently "tune" the brain and affect mood, focus, and cognition of human subjects. More particularly, the invention relates to individuals suffering from the attention deficit hyperactivity disorder, also known as ADHD. The mechanism has the possibility to create a controlled-environment for the brain that produces any of the 5 brain-wave types(Gama/Beta/Alfa/Teta), and thus enhance the concentration, learning ability, relaxation and even calm the person down. This is done by sending electro-magnetic waves in specific frequency which in return activates the neurons to response through enhancing the production of a specific brain-waves. Thus, by our machine not only can we control which brain-wave should dominate at the time of stimulation, but also how intensely should it dominate.Dans certains modes de réalisation, linvention concerne des dispositifs et des procédés pour moduler lactivité électrique dun cerveau dune manière ciblée à laide dun champ magnétique faible, généralement un champ ayant une intensité inférieure à environ 150 micro-Tesla. Le champ magnétique est modifié au cours du temps de manière périodique, généralement avec une fréquence réglée pour affecter spécifiquement les fréquences intrinsèques du cerveau. Les dispositifs et procédés de "Stimulation Magnétique à Faible Champ" décrits ici modulent lactivité électrique dun cerveau sans nécessiter de médicaments. Les procédés et les dispo
