Once this skill is mastered then additional levels are added for the user to change to. Overlays are placed on the Macaw in a page turning method in order for the user to independently turn pages and change levels. Adolescent with advanced Duchenne's muscular dystrophy who can direct select in 8 location but is very slow and getting nowhere. Non-ambulatory, severely motor impaired, has use of fingers in one hand but timing of switch movements is difficult. There is some cognitive involvement and literacy skills are nonfunctional with very little sight word recognition.
Vision is fine and there is some residual spoken language.
Three switch Morse code input was chosen due to the users poor timing of switch movements. The Macaw 3 is set to a key pattern of 32 but only 16 messages are programmed initially. Multiple overlays are used with the select level and key linking features activated. The overlays are placed on the Macaw in a page turning method in order for them to be changed quickly and independently by either the user or an assistant. Language is thematic based with single hit messages and some simple key linking.