HCI Word Scramble

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Question	Answer
is made up of various elements each of these elements affects the interaction input devices	Computer/Computer System
basic parts of computer system	screen, or monitor, keyboard, & mouse/trackpad
Most common text input device	Keyboards
Allows rapid entry of text by experienced users, & Usually connected by cable, but can be wireless	Keyboards
non-alphanumeric keys are placed differently, & accented symbols needed for different scripts, & minor differences between UK and USA keyboards	QWERTY
arrangement not optimal for typing, & layout to prevent typewriters jamming!	QWERTY
keys arranged in alphabetic order, & not faster for trained typists, & not faster for beginners either!	Alphabetic
common letters under dominant fingers, & biased towards right hand, & common combinations of letters alternate between hands	Dvorak
designs to reduce fatigue for RSI, & for one handed use	special keyboards
only a few keys - four or 5 letters typed as combination of keypresses	Chord keyboards
use numeric keys with multiple presses 2 – a b c 6 - m n o 3 - d e f 7 - p q r s 4 - g h i 8 - t u v 5 - j k l 9 - w x y z hello = 4433555[pause]555666 surprisingly fast!	phone pad and T9 entry
type as if single key for each letter, & use dictionary to ‘guess’ the right word, & hello = 43556 …	T9 predictive entry
Text can be input into the computer, using a pen and a digesting tablet, & natural interaction	Handwriting recognition
Improving rapidly, & Most successful when:	Speech recognition
for entering numbers	Numeric keypads
Handheld pointing device: very common, & easy to use	Mouse
Two characteristics of the mouse	planar movement, & buttons
Ball on underside of mouse turns as mouse is moved, & Rotates orthogonal potentiometers, & Can be used on almost any flat surface	Mechanical
light emitting diode on underside of mouse, & may use special grid-like pad or just on desk	Optical
small touch sensitive tablets	Touchpad
‘stroke’ to move mouse pointer used mainly in laptop computers	Touchpad
ball is rotated inside static housing. & like an upsdie down mouse!	Trackball
two dials for X-Y cursor position	Thumbwheels …– for accurate CAD
single dial on mouse	Thumbwheels …– for fast scrolling
indirect, pressure of stick = velocity of movement	Joystick
often used for computer games, & aircraft controls and 3D navigation	Joystick
for laptop computers, & miniature joystick in the middle of the keyboard	Keyboard nipple
Detect the presence of finger or stylus on the screen., & works by interrupting matrix of light beams, capacitance changes or ultrasonic reflections	Touch-sensitive screen
direct pointing device	Touch-sensitive screen
small pen-like pointer to draw directly on screen	Stylus
may use touch sensitive surface or magnetic detection	Stylus
used in PDA, tablets PCs and drawing tables	Stylus
now rarely used, & uses light from screen to detect location	Light Pen
Mouse like-device with cross hairs, & used on special surface and rather like stylus	Digitizing tablet
very accurate & used for digitizing maps	Digitizing tablet
control interface by eye gaze direction. & uses laser beam reflected off retina	Eyegaze
Four keys (up, down, left, right) on keyboard. & Very, very cheap, but slow.	Cursor keys
screen is vast number of coloured dots	bitmap displays
diagonal lines that have discontinuities in due to horizontal raster scan process.	Jaggies
softens edges by using shades of line colour & also used for text	Anti-aliasing
Stream of electrons emitted from electron gun, focused and directed by magnetic fields, hit phosphor-coated screen which glows	Cathode ray tube
used in TVs and computer monitors	Cathode ray tube
Smaller, lighter, and … no radiation problems.	Liquid crystal displays
draw the lines to be displayed directly, & no jaggies, & lines need to be constantly redrawn , & rarely used except in special instruments	Random Scan (Directed-beam refresh, vector display)
Similar to random scan but persistent => no flicker. & Can be incrementally updated but not selectively erased. & Used in analogue storage oscilloscopes	Direct view storage tube (DVST)
used for meetings, lectures, etc.	large displays
usually wide screen	plasma
lots of small screens together	video walls
RGB lights or LCD projector. & hand/body obscures screen	projected
frosted glass + projector behind	back-projected
displays in ‘public’ places. Large or small & very public or for small group	situated displays
thin flexible sheets, & updated electronically	Digital paper
steering wheels, knobs and dials … just like real!	cockpit and virtual controls
six-degrees of movement: x, y, z + roll, pitch, yaw	the 3D mouse
fibre optics used to detect finger position	data glove
detect head motion and possibly eye gaze	VR helmets
accelerometers strapped to limbs or reflective dots and video processing	whole body tracking
ordinary screen, mouse or keyboard control, & perspective and motion give 3D effect	desktop VR
use stereoscopic vision, & VR helmets, & screen plus shuttered specs, etc.	seeing in 3D
mve head … lag … display moves	time delay
headset gives different stereo distance, & but all focused in same plane	depth perception

Created by: cessy_comscie