Chapter 1- Reasoning and thinking Flashcards
The process by which we use the knowledge we have to draw conclusions
Reasoning
3 different types of reasoning
Deduction
Induction
Abduction
derives the logically necessary conclusion from the given premises.
General rule> Specific conclusion (always true)
Deduction
Generalizing from cases to we have seen to infer information about cases we have not seen.
Specific observation> General conclusion ( Maybe true)
Induction
From a fact to the action or state that caused it
Incomplete observation>Best prediction (may be true)
Abduction
The process of finding the solution to an unfamiliar taste, using the knowledge that we have.
Problem Solving
5 different views of problem solving
Gestalt theory
Problem Space theory
Use of analogy
Skills acquisition
Errors and mental models
Problem solving is both productive and reproductive
Gestalt theory
Comprises problem states and problem solving involves generating these states using legal state transition operators
Problem Space theory
Problems are solved by mapping knowledge relating to a similar known domain to the new problem
Use of analogy
According to the ATC model, skills are acquired through various levels,
Skills Acquisition
There are different types of errors: changes in context of skilled behaviour can cause errors. An incorrect understanding / model of a situation can cause errors too.
Errors and mental models
Our body responds biologically to an external stimulus and we interpret that is some ways as particular ______________
Emotion
The principles and properties discussed apply to the majority of people, but humans are not all the same.
Individual differences
process of a information transfer
Interaction
What are the 5 text-entry devices?
Alphanumeric keyboard
Chord Keyboards
Phone pad and T9 entry
Handwriting recognition
Speech recognition
Only a few keys are used. Letters are produces by pressing multiple keys at once
Chord Keyboards
The numeric keys on a cell phone can be pressed more than once to enter letters.
Phone pad and T9 entry
2 keypad modes most phones have:
numeric
alphanumeric mode
-deals mostly worth stroke information
-the way in which letter is drawn, not the letter itself.
-has the advantages of size and accuracy over small keyboards and are therefore often used in mobile computing
Handwriting recognition
-performance is relatively low even, for a restricted vocabulary.
-Adjusting the system for use with natural language gives birth to even more problems: the ‘error’ in natural language use, different voices, emotions and accents, etc.
Speech recognition
Types of positioning
The mouse
Touchpad
Trackball and thumbwheel
Joystick and keyboard nipple
Touch sensitive screens (touchscreen)
Stylus and lightpen
Digitalizing tablet
Eyegaze
Cursor keys and discrete positioning
-an indirect device, because a transformation is required to map from the horizontal nature of the desktop to the vertical alignment of the screen.
Mouse
-touch-sensitive tablets, operated by sliding the finger over it and are mostly used in notebook computers.
touchpad
-an upside-down mouse: instead of moving the devices itself, the ball is rolled to move the cursor.
-offer less usability because they can only manipulate the horizontal and vertical movement of the cursor.
Trackball and thumbwheel
Two types of joystick:
absolute sticks
isometric sticks
tiny joysticks that sometimes used on notebook computers.
Keyboard nipples
-detect the position of the user’s finger or stylus on the screen itself and are therefore very direct.
Touch sensitive screens (touchscreen)s
For more accurate positioning, systems with touch sensitive surfaces often imply a stylus
Stylus and lightpen
Device used for freehand drawing
Digitalizing tablet
Allow you to control the computer by looking at it while wearing special glasses, heat mounted boxes, etc.
Eyegaze
For 2d-navigation, this can sometimes preferable. The same goes for remote-controls and cellphones.
Cursor keys and discrete positioning
4 Types of display devices
Bitmaps display, resolution, and color
Technologies
Large displays and situated displays
Digital papers
means that display is made of fixed number of dots or pixels in rectangular grid
Bitmaps display , resolution and color
In LCD’s a thin layer of liquid crytals is sandwiched between two glass plates. External lights pass through the top plate and are polarized. this passes through the crystal and is reflected back to the user’s eye.
Technologies
- there several types of this
-some use gas plasma technology
-projector is possible too.
Large displays and situated displays
have small screen through which lights is projected on screen
LCD projectors
Thin flexible paper material that can be written to electronically, but keep its contents when removed from the power supply.
Digital papers
2 devices for virtual reality and 3d interaction
Positioning in 3d
3d displays
Human can use a 3d environment with a 2d device (mouse). The human mind is therefore capable of handling multiple degrees of indirection.
Positioning in 3D
can be displayed in normal screen using shadows, depth etc. User can enter a VR cave, where the VR world is projected around them.
3d displays
What happens if the VR systems performances too slow, and there is delay between movement and image?
disorientation and sickness may occur.
5 Physical controls, sensors and special devices
Special displays
Sound output
Touch, feel and smell
Physical controls
Environment and bio-sensing
-numerous display devices such as LED’s and head-up displays
Special displays
By having sounds confirms a right action, we can speedup interaction
Sound output
Haptic devices are various forms of forms of force, resistance and texture influencing our physical senses.
Touch, feel and smell
Not only the functions of controls, but it is also physical design is important and needs to suit the situation in which it used.
Physical controls
Many sensors in our environment monitor our behaviour. Their measurements ranges from temperature and movement to the user’s emotional states.
Environment and bio-sensing
4 types of Paper: Printing and Scanning
Printing
Fonts and page description languages
Screen and page
Scanner and optical character recognition