There are many different types of AIT devices available.
Are they equally effective?
At the present time, there is very little research on whether or not the available AIT devices are equally effective. The AIT devices currently available include: the Digital Auditory Aerobics (DAA), the Earducator, the Electronic Auditory Stimulation Effect (EASe discs), and the Kirby Method of AIT. In addition, many practitioners are using the AudioKinetron and the BGC Audio Tone/Enhancer Trainer (ATET). These two AIT devices are no longer manufactured.
Not one of these devices is identical to another. The differences include: the music source, how the music is processed (i.e., modulated), and/or how auditory peaks are filtered (i.e., the width and depth of the narrow band filters). Dr. Guy Berard considers each one of these components critical to the AIT process.
There have been only two studies that have compared the effectiveness of AIT devices. Rimland and Edelson (1994) compared the AudioKinetron and the ATET to one another and found no differences between the two devices. Brockett (2001) recently compared the effects of the Earducator to the AudioKinetron and found no differences. Although there is some research indicating that the Kirby Method of AIT and the EASe method are effective, there is no evidence at the present time to indicate whether they are more, less, or equally effective in relation to the other AIT devices. We are not aware of any published research on the efficacy of the DAA device, although research is underway.