Speech Generating Devices


Who Can Use SGDs and Where Can They Be Used?



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Who Can Use SGDs and Where Can They Be Used?


Initial SGD training and support is often provided by a speech-language pathologist; however, other professionals, parents, or caregivers must support the ongoing use of the device by learners with ASD to facilitate generalization and maintenance of skills. Research has shown that SGDs are effective not only in supporting communication skills (e.g., Parsons & La Sorte, 1993; Schepis, Reid, Behrmann, & Sutton, 1998; Sigafoos, et al., 2004), but also in helping learners develop academic skills (Schlosser & Blischak, 2001). Because SGDs are portable, learners may be taught how to use them in school, at home, or in community settings.

Which Assessments Should be Completed Before Using an SGD?

If you are considering using an SGD with a learner with ASD, some assessments have probably already been completed. Such assessments often consist of formal intelligence tests and tests of adaptive behavior/functioning, including social interactions and communication skills. When used with learners with ASD, standardized testing frequently results in an underestimation of the learner's functional level. This, in turn, may lead to inappropriate educational planning and provide a roadblock to SGD acquisition (Koegel, Koegel, & Smith, 1997). Therefore, it is important to include observations and knowledge of how learners acquire skills and their interests during the assessment process. Having a speech-language pathologist who is experienced with ASD and AAC is pivotal to the success of the plan. Teachers/practitioners and caregivers should consider finding a specialist who is willing to work with the team on at least a consultative basis. Depending on the learner, an occupational therapist may need to be consulted as well to determine how the learner will use the device (e.g., pushing buttons, positioning).



The following questions may be helpful when choosing the type of SGD or other AAC system to use with an individual learner with ASD (adapted from Quill, 2000):

  • What motivates the learner to communicate?

  • What is the learner's current most-frequently used means of communication (formal or informal)?

  • What other AAC systems has the learner used or attempted to use in the past? If the system was unsuccessful, identify teaching methods and/or other factors that were problematic.

  • Does the learner show an interest in using graphic symbols or pictures? If learners are able to read, use of text may be more meaningful and/or motivating for them.

  • What motoric and/or cognitive challenges does the learner have that must be addressed while teaching use of the device?

  • What seems to be the easiest AAC system for the learner to use?

  • What seems to be the most functional means of communication for the learner?

  • What are the AAC preferences of the learner's family?

  • What are the AAC preferences of the learner's teachers and school support staff? If developmentally appropriate, what are the preferences of the learner?

  • Who are the learner's current communication partners? Who else might he or she communicate with through an SGD?

  • Does the learner engage in interfering behaviors (e.g., disruptive, repetitive, stereotypical) that should be considered when selecting a device? For example, some learners engage in self-stimulatory behaviors with pictures or icons (e.g., flicking/flapping card), and an SGD may circumvent that problem. Other learners habitually fling objects, so the device may need to be attached to a desk with Velcro or some other means.

Based on the answers to these questions, the long-term goals from the individualized education program (IEP) or individualized family service plan (IFSP), and the preferences and needs of the learner, teachers/practitioners, caregivers and other team members can identify the basic type of SGD device that may be effective with an individual learner with ASD. Teachers/practitioners and caregivers also may consider having individual learners interact with a few devices to identify the specific device that might be most effective. Before purchasing the SGD, teachers/practitioners and caregivers should allow the individual learner to use it on a trial basis (even up to a month may be necessary to establish that it is a good match). It may be possible to borrow a device from a school, clinic, university, or educational resource library during this trial period. Because funding sources, such as Medicaid, frequently are only available to purchase a single high-end device, it is very important that the SGD selected is a good fit for the learner.

What Other Factors Should Be Considered Before Using an SGD?


Additional factors also should be considered prior to selecting and purchasing an SGD including the following:

  • how information will be displayed for the user,

  • how vocabulary will be selected by the user,

  • how portable the device needs to be,

  • the type of support available from the device manufacturer and/or professionals in your area, and

  • what types of financing are available.

Displaying Information


Before choosing an SGD, teachers/practitioners and caregivers should decide how to display the information on the device in a way that is age- and developmentally appropriate for the individual learner. This can be crucial to the successful use of the device.

Static screen devices use an overlay that has pictures, symbols, or words to identify the chosen message. The number of pictures, symbols, and words is limited so that the screen always looks the same unless someone physically changes the overlay or reprograms the device. Dynamic screen devices allow the learner to access a virtually limitless vocabulary. The electronic display changes as the user selects different categories and functions (similar to a menu option on a computer), which may be represented by pictures, symbols, or words that are relevant and useful for the person using the device. Some dynamic screen devices use specific icon systems (e.g., BoardmakerTM pictures www.mayer-johnson.com); others are more flexible. Some newer devices even include digital cameras, which allow teachers/practitioners and caregivers to take a photo of an object or person, record a message, and play the word or phrase within minutes. Typically, less expensive SGDs use static screens, while the more costly ones have dynamic screens.




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