Follow the link for more information. An AAC user indicates a series of numbers on an eye gaze communication board in order to convey a word. Modern use of AAC began in the 1950s with systems for those who had lost the ability to speak following surgical procedures. AAC systems are diverse: unaided communication uses no equipment and includes signing and body language, while aided methods of release of the speech at children of early age use external tools.
The evaluation of a user’s abilities and requirements for AAC will include the individual’s motor, visual, cognitive, language and communication strengths and weaknesses. The evaluation requires the input of family members, particularly for early intervention. Augmentative and alternative communication is used by individuals to compensate for severe speech-language impairments in the expression or comprehension of spoken or written language. The addition of “alternative” followed later, when it became clear that for some individuals non-speech systems were their only means of communication. There were three, relatively independent, research areas in the 1960s and 1970s that lead to the field of augmentative and alternative communication. First was the work on early electromechanical communication and writing systems.
Unaided AAC systems are those that do not require an external tool, and include facial expression, vocalizations, gestures, and sign languages and systems. In contrast, sign languages have a linguistic base and permit the expression of an unlimited number of messages. Approaches to signing can be divided into two major categories, those that encode an existing language, and those that are languages in their own right. A table of four rows and five column. It has a printed word and a icon in each cell.
This communication board, showing a food category, is a low-tech AAC aid. 20cm across, has a touchscreen showing communication symbols but no keyboard. This speech generating device, showing available categories in a grid layout, is a high-tech AAC aid. Low-tech communication aids are defined as those that do not need batteries, electricity or electronics. High-tech AAC aids permit the storage and retrieval of electronic messages, with most allowing the user to communicate using speech output.
High-tech systems may be dedicated devices developed solely for AAC, or non-dedicated devices such as computers that run additional software to allow them to function as AAC devices. They may be static or dynamic in form. High-tech devices vary in the amount of information that they can store, as well as their size, weight and thus their portability. Keyboard used to create speech over a telephone using a Text to Speech converter. Devices with voice output offer its user the advantage of more communicative power, including the ability to initiate conversation with communication partners who are at a distance.