Neurofeedback can be useful in several neurological diseases if the user knows that his/her current mental state can be modify it to improve his/her development. The NFB here proposed provides modulation of cortical areas of the brain through motor imagery tasks (ERD-ERS). The topographic representation of the brain activity is shown for the user after motor task, .which are based on motor imagery of the left and right arm movements separately. Preliminary tests show that only some volunteers get good performance with feedback and have high activation level.