Skills that can be learned using a switch (4)
Cause/effect
turn taking
concept building
scanning skills
Hierarchy of switch placement
6
what not to illicit when placing a switch
Does not….
Steps to teach scanning (3)
scanning formats:
Vertical or horizontal arrangement of arrays?
Linear scanning
scanning formats:
items one at a time in a circular motion
Rotary scanning
scanning formats:
Increases number of items being scanned
Group item scanning
scanning formats:
Each row is highlighted
In row column scanning
Scanning techniques:
– scan items continuously at an establ. Rate. This rate or flow can be increased or decreased
Automatic scanning
Scanning techniques:
this type of scanning requires the user to activate the switch through each time. The user MUST be able to exert a sufficient amount of effort to use this technique. They also MUST NOT be susceptible to quickly fatiguing.
Step scanning
Scanning techniques:
– hold down the switch and release it when the item chosen is highlighted. Need good motor control because they may be holding the switch down for some time.
Inverse scanning
good for individuals who may have difficulty writing because of fatigue, or minimally impaired motor control. Typically has full alphanumerical array with letters, symbols, numbers, and special keys (delete, shift etc.)
Standard key board
keyboard layout with the most frequently used keys are on the home row. This limits fatigue.
Dvorak
Key board additions :
(for poor fine motor skills)
(Protects against spillage)
(For poor vision)
Used on a traditional keyboard to give the keys new meaning
name a few brands
Alternative keyboards
Intellikeys, Overlay Maker, Intellipics
Common switches
Big Red, Jelly Bean, Power Link, Squeeze, Sip & Puff, Movement switch
when should a second switch be introduced
Only after the first switch has been mastered
Null switch
used when introducing 2nd switch. it does nothing at first but is just placed in the child’s visual field.
Characteristics that must be considered in switch selection
Considerations for switch selection
Involves a vis. Display presented in a sequential manner
The switch is activated when the scanning procedure highlights the choice or choices selected
• SCANNING FORMATS
an OTA needs to be trained in scanning T/F
TRUE
Joystick
Joysticks are often not recommended for who?
people with cognitive disabilities