The commercial pilot was practicing touch and go landings on a dirt strip in his single-engine experimental light sport aircraft when he decided to make a full stop landing and taxi back for another take off. While on the take off roll at a high rate of speed, and before the tail was raised, the nose of the airplane veered to the left and the pilot used the right rudder pedal to maintain directional control but accidentally hit the toe brake. As a result, the airplane turned about 110 degrees to the right and the airplane collided with the ground and scrub brush with both wing tips before it came up on its nose. The wooden propeller was shattered and a portion of the airframe and both wings were substantially damaged. The pilot reported there were no pre-mishap mechanical deficiencies.