Control Interfaces for Assistive Technology. Hsin-yu Chiang, ScD, OT. Learning Objectives. Describe the elements of Human/Technology interface Describe the characteristics of Control Interfaces Learn how to select Control Interfaces for the users Identify technologies for direct selection
Hsin-yu Chiang, ScD, OT
●Control Interface: input device
discrete inputs (computer keyboard), continuous inputs (mouse)
● Selection Set
Visual (computer keyboard), tactile (braille), auditory(spoken choices)
Direct selection, indirection selection
● The processor:connecting the interface to the
Generate feedback & activity output
●Spatial characteristic: placement and size of CI
Its overall size, weight & shape; no. of target within CI; size of target; spacing between target….
● Activation & Deactivation characteristic: how it
Movement (eye, head, tongue)
Mechanical CI:keyboard, joystick..
Electromagnetic CI:light detector, IR remote
Electrical CI: EMG
Proximity CI: heat sensitive switch
Phonation: sound switch, speech recognition……
Effort, displacement deactivation flexibility durability & maintainability
● Sensory characteristic: what feedback is obtained?
Auditory: click sound Somatosensory: tactile, kinesthetic, propriceptive Visual: color
Outcomes of Needs Identification
Outcomes of Physical-Sensory Evaluation
● Most rapid, preferred over the use of indirect selection
● Some critical questions to ask for keyboard using
● Some alternative keyboards
Expanded keyboard, contracted keyboard, touch screen, tongue-touch keypad………..
Ergonomic Keyboard (vertical-split keyboard)
AlphaTalker (special purpose keyboard)
Flexible mounting system