We perceive sound via the audio-vocal loop. Then, we analyze it, assimilate it, and continuously adjust in response to it. This process relies upon auditory discrimination, phonological awareness, and rhythm. Forbrain ®, an altered auditory feedback (AAF) device, takes advantage of this audio-vocal loop & heightens a user’s perception of his own voice & speech through bone conduction headphones that are equipped with a high sensitivity microphone. As the user talks into the microphone, a patented electronic dynamic filter blocks out environmental noise & amplifies the user’s voice, enhancing long vowels and other sounds that are the building blocks of language.