AAC

concepts are not explicit, proportionality is not preserved,

better for young toddlers, vocab embedded under hot spots

2 yr olds perform more accuratly with vsd's but poorly with both types

familiar and personalized events, support understanding and meaning, motivating and entertaining concepts, preserve location and size of symbols, organize schematically

large hotspots, bright colors, engaging voice output, appropriate games peekaboo

gradually decrease hotspot size, bright colors, animated facial expressions, aappropriate songs/games

imaginative play with partner, dolls/animals, blocks, cars, story books to read, concepts shapes colors numbers

Fixed, level-based, dynamic, letter-based

static, doesnt change, page in a book, screen doesnt change, "simple digitized system"

type of fixed display and SDS(Simple digitized system) has multiple levels, increasing storage capacity

changes depending on input/what buttons are pushed, like a smart phone touch screen

use letters as input and output, keyboard, many use abbreviation expansion and prediction

Alpha letter, alpha numeric, numeric, arbitary

uses first letter of keywords, Hello How are you=HH

uses category and first letter of phrase Hello how are you=GH (greeting, hello_

letters and numbers are used, Hello How are you=G1, greeting 1

only numbers are used, relation of code and number is arbitary Hello How are you=62

totally arbitary, uses symbols with letters or numbers A/=hello how are you

device or listener anticipates elements of a learners message and offers pre-predicted letters, words, or phrases based on syntax and context

always makes same prediction for given input T always predicts The, TH always predicts that

uses frequency of use or recency to predict

Pictures or icons combined to store word, phrase or sentence

Number of items
size
spacing and arrangement
orientation of display

position of display relative to the floor

determined by users visual motor capabilities, further apart=easier

Schematic
taxonomic
semantic/grammatical
alphabetic order
importance/frequency of use

visual scene, best for kids, uses schemas, based on events and experiances

categorical, heiarchy, how adults think

agent, action, descriptor objects together, used to promote lang development but not permenantly

small groups, schematically, NOT page level

bright colors, glossy plastic, various shapes, can be transformed bult up and broken down, lightweight, popular themes, songs, sound effects, explicit immediate feedback for actions, moveable parts, colorful and fun, toy-like

pictures of humans are prefered to look at, large eyes and faces,

indicating the item directly from the screen

using part of body to point, finger, toe, eyegaze

pointing with additional aids, headstick, chinstick, pointer, lazerbeam

must sustain contact with desired item for certain amount of time before it registers, like power off cell phone

selection occurs when contact is disengaged from device, hand is lifted off button

selects the iten that was chosen the most over a specific time period, good for muscle tremors

timedactivation, release activation, averaged activation

for very severe motor impairments, learner is offered choices in predetermined order, selects by using a signal, usually a switch, cognitavly more difficult than direct

linear, circular, row-column, group item, directed

also known as sequential, default most commanly used, cursor goes across rows one symbol at a time from left to right then moves to first symbol on left in the next row, like reading a book

cursor moves in clockwise or counter clockwise direction around a circular display

person sleects a group first, then individual itms within the group

type of group item, learner selects row first, then cursor moves across row and they select symbol in that roq

learner uses a directional control switch like a joystick to determine direction of cursor

linear is more effective for smaller than 6 symbols, above 6 symbols row column becomes more effective

Automatic scanning, inverse scanning, step scanning

cursor moves through items with a certain pattern automatically and switch is pressed when it lies on desired item

cursor starts moving when switch is held down, cursor moves through scanning pattern, when learner releases the switch, the object the cursor was on is selected

cursor moves through preset pattern one step at a time for each time the switch is pressed, once target is reached you wait, then it will know to select by the pause