Individualized Auditory Stimulation

Individualized Auditory Stimulation (IAS) is a procedure developed in Denmark by Kjeld Johansen, PhD, Msc, as a process for increasing the perception and processing of sounds, in particular speech sounds for individuals with dyslexia. It is a noninvasive music listening program that was created with the understanding that individuals can have normal hearing, but still have a weakness in the brain's ability to perceive and process speech sounds which can then lead to poor language and reading skills. The music can be individualized and utilized at home or in a school setting by listening via headphones. The procedure for developing the Individualized Auditory Stimulation (IAS) typically involves completing a pure tone screening for listening with the use of an audiometer, as well as screening for an ear preference and auditory discrimination. The screening results are then used to specifically tailor specialized music to follow the optimum hearing curve developed by A.A. Tomatis, by either increasing or decreasing the sound frequencies with the use of an equalizer.
The specialized music was developed by Kjeld Johansen and Bent Holbech of ROTNA Music, to contain specific rhythmical changes and right ear stimulation to enhance the awareness and perception of speech sounds as well as use of the left brain for processing these sounds for better language development. The current name for the program using the individualized listening process is Johansen's Individualized Auditory Stimulation (JIAS). Other names that have been used in the past have included Johansen Sound Therapy (JST), Auditory Discrimination Training (ADT) and Hemisphere Specific Auditory Stimulation (HSAS).

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