How are messages created or formulated on the devices?
SGDs contain selection sets or symbols to represent language. Selection sets can be any combination of photographs, line drawings, text, objects (on some static display devices), or other graphic symbols. Symbols can vary in size and may be in color or black and white depending on the device. Symbols can represent entire messages (e.g., a picture of a toilet to represent “I have to use the bathroom”), phrases, single words or letters. Some symbols must be combined with others symbols to create words, sentences, or complete messages (e.g., semantic compaction).
