HCI Chapter 2-4: Computer Interaction Devices
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Questions and Answers

What is the primary characteristic of the mouse that makes it an indirect manipulation device?

  • It has a screen cursor oriented in the (x, z) plane
  • It requires physical space on the desktop
  • It is a handheld pointing device
  • It uses relative movement to detect cursor movement (correct)

    • What is the advantage of the mouse being located on the desktop?

  • It is faster
  • It is more ergonomic
  • It is more accurate
  • It requires no arm fatigue (correct)

    • What is the plane in which the screen cursor moves?

  • (x, y) plane (correct)
  • (z, x) plane
  • (x, z) plane
  • (y, z) plane

    • What is the typical number of buttons on a mouse?

    <p>1 to 3 buttons</p> Signup and view all the answers

    What is the problem faced by novice users when using a mouse?

    <p>Hand-eye coordination</p> Signup and view all the answers

    What is the characteristic of the mouse that allows it to be accurate and fast?

    <p>The device itself doesn't obscure the screen</p> Signup and view all the answers

    What is the primary mechanism by which optical mice detect motion?

    <p>Measuring the fluctuating alterations in reflected light intensity</p> Signup and view all the answers

    What is the main advantage of optical mice over mechanical mice?

    <p>Less susceptibility to dust and dirt</p> Signup and view all the answers

    What type of device is typically used in laptops to control mouse movement?

    <p>Touchpad</p> Signup and view all the answers

    What is the primary purpose of 'acceleration' settings in touchpads?

    <p>To enable faster movement</p> Signup and view all the answers

    What is a characteristic of trackballs?

    <p>They are indirect devices</p> Signup and view all the answers

    What is an example of a common application of foot controls?

    <p>Sewing machines</p> Signup and view all the answers

    What is the purpose of the two dials on a thumbwheel?

    <p>For accurate CAD</p> Signup and view all the answers

    What is a characteristic of a joystick?

    <p>It is used for indirect control</p> Signup and view all the answers

    What is a keyboard nipple used for?

    <p>For indirect joystick control on laptops</p> Signup and view all the answers

    How does a touch-sensitive screen detect input?

    <p>By interrupting a matrix of light beams</p> Signup and view all the answers

    What is a disadvantage of using touch-sensitive screens?

    <p>Finger marks can be left on the screen</p> Signup and view all the answers

    What is a stylus used for?

    <p>Direct drawing on touch-sensitive screens</p> Signup and view all the answers

    What is a light pen used for?

    <p>For detecting light from the screen</p> Signup and view all the answers

    What is an eyegaze control interface used for?

    <p>For controlling devices with eye gaze direction</p> Signup and view all the answers

    What is a characteristic of the mouse that allows it to be classified as a handheld pointing device?

    <p>It is used for making selections and initiating drawings</p> Signup and view all the answers

    What is the primary advantage of the mouse being located on the desktop?

    <p>It reduces arm fatigue</p> Signup and view all the answers

    What type of movement is detectable by the mouse?

    <p>Relative movement</p> Signup and view all the answers

    What is the plane in which the mouse movement takes place?

    <p>(x, z) plane</p> Signup and view all the answers

    What is a limitation of the mouse for novice users?

    <p>It causes hand-eye coordination problems</p> Signup and view all the answers

    What is an advantage of the mouse over other pointing devices?

    <p>It is faster</p> Signup and view all the answers

    What is a characteristic of the mouse that makes it an indirect manipulation device?

    <p>The device itself doesn't obscure the screen</p> Signup and view all the answers

    What is a common use of a mouse?

    <p>All of the above</p> Signup and view all the answers

    What is a characteristic of the mouse that makes it easy to use?

    <p>It is very common and easy to use</p> Signup and view all the answers

    What is the primary purpose of a joystick in computer applications?

    <p>To enhance gaming experience</p> Signup and view all the answers

    What is a common limitation of touch-sensitive screens?

    <p>They can be imprecise due to finger size</p> Signup and view all the answers

    What is the primary advantage of using a stylus over a finger on a touch-sensitive screen?

    <p>It is more precise due to its smaller size</p> Signup and view all the answers

    What is the primary characteristic of a thumbwheel that makes it suitable for accurate CAD?

    <p>It has two dials for precise X-Y cursor movement</p> Signup and view all the answers

    What is the primary mechanism used by a light pen to detect input?

    <p>It uses light from the screen to detect location</p> Signup and view all the answers

    What is the primary benefit of using a touch-sensitive screen in a hostile environment?

    <p>It is clean and safe from damage</p> Signup and view all the answers

    What is the primary characteristic of a digitizing tablet that makes it suitable for digitizing maps?

    <p>It is very accurate</p> Signup and view all the answers

    What is the primary advantage of using a stylus over a finger on a PDA?

    <p>It is more precise due to its smaller size</p> Signup and view all the answers

    What is the primary limitation of using a keyboard nipple?

    <p>It is not precise enough for accurate drawing</p> Signup and view all the answers

    What is the primary purpose of an eyegaze control interface?

    <p>To control the interface by eye gaze direction</p> Signup and view all the answers

    What is the primary mechanism by which mechanical mice detect motion?

    <p>By rotating orthogonal potentiometers</p> Signup and view all the answers

    What is a characteristic of touchpads that allows for accurate positioning?

    <p>Slow stroke with less pixels per inch moved</p> Signup and view all the answers

    Which type of mouse is less susceptible to dust and dirt?

    <p>Optical mouse</p> Signup and view all the answers

    What is a characteristic of trackballs that makes them suitable for gaming?

    <p>High accuracy and fast movement</p> Signup and view all the answers

    What is the primary purpose of 'acceleration' settings in touchpads?

    <p>To adjust the cursor speed</p> Signup and view all the answers

    What is a common application of foot controls?

    <p>All of the above</p> Signup and view all the answers

    What is the primary mechanism by which optical mice detect motion?

    <p>Detecting changes in reflected light intensity</p> Signup and view all the answers

    What is a characteristic of mechanical mice?

    <p>They can be used on almost any flat surface</p> Signup and view all the answers

    What is a characteristic of touchpads?

    <p>They are used mainly in laptop computers</p> Signup and view all the answers

    What component of a computer system affects the interaction in terms of text entry and pointing?

    <p>Input devices</p> Signup and view all the answers

    What is the primary function of the computer system's processing component?

    <p>To execute instructions and perform calculations</p> Signup and view all the answers

    What type of devices dictate the styles of interaction that a computer system supports?

    <p>Input devices</p> Signup and view all the answers

    What is the primary function of a computer's memory component?

    <p>To store data temporarily and permanently</p> Signup and view all the answers

    What type of computer system is typically carried in a pocket?

    <p>PDA</p> Signup and view all the answers

    What is a characteristic of a 'typical' computer system?

    <p>It has a keyboard and mouse</p> Signup and view all the answers

    What is a common purpose of paper in a computer system?

    <p>To act as input and output device</p> Signup and view all the answers

    What type of interaction is facilitated by virtual reality devices?

    <p>Special interaction and display</p> Signup and view all the answers

    What is a common example of a computer system in a household?

    <p>All of the above</p> Signup and view all the answers

    What is a characteristic of the interaction between humans and computers?

    <p>It involves various devices and elements</p> Signup and view all the answers

    What is a common advantage of the Dvorak keyboard layout?

    <p>Improved ergonomics</p> Signup and view all the answers

    What is a characteristic of chord keyboards?

    <p>Compact size and fast typing</p> Signup and view all the answers

    What is a limitation of phone pad and T9 entry?

    <p>Slow typing speed</p> Signup and view all the answers

    What is a challenge in handwriting recognition?

    <p>All of the above</p> Signup and view all the answers

    What is a benefit of using a pen and tablet for input?

    <p>Natural interaction</p> Signup and view all the answers

    What is a characteristic of Maltron keyboards?

    <p>Designed for one-handed use</p> Signup and view all the answers

    What is a limitation of chord keyboards?

    <p>Fatigue after extended use</p> Signup and view all the answers

    What is a benefit of using a stylus on a touch-sensitive screen?

    <p>Improved accuracy</p> Signup and view all the answers

    What is a characteristic of Dvorak keyboards?

    <p>Common letters under dominant fingers</p> Signup and view all the answers

    What is a benefit of using a handwriting recognition system?

    <p>Natural interaction</p> Signup and view all the answers

    What is the primary characteristic of modern computing?

    <p>Interactive with rapid feedback</p> Signup and view all the answers

    What is the most common text input device?

    <p>Keyboard</p> Signup and view all the answers

    What is the primary reason for the QWERTY layout?

    <p>To prevent typewriters from jamming</p> Signup and view all the answers

    What is a limitation of the QWERTY layout?

    <p>It is not optimal for typing</p> Signup and view all the answers

    What is an alternative to the QWERTY layout?

    <p>Alphabetic layout</p> Signup and view all the answers

    What is a characteristic of interactive computing?

    <p>Rapid feedback</p> Signup and view all the answers

    What is a common use of sensors and devices?

    <p>Richer interaction</p> Signup and view all the answers

    What is a characteristic of modern devices?

    <p>They are typically wireless</p> Signup and view all the answers

    What is an advantage of modern computing?

    <p>Rapid feedback</p> Signup and view all the answers

    What is a common application of sensors and devices?

    <p>Richer interaction</p> Signup and view all the answers

    What is the primary function of a computer's memory component in relation to human-computer interaction?

    <p>To store data temporarily and permanently</p> Signup and view all the answers

    What type of device is used to provide a special interaction and display in human-computer interaction?

    <p>Virtual reality device</p> Signup and view all the answers

    What is the primary factor that dictates the styles of interaction a computer system supports?

    <p>The type of devices used</p> Signup and view all the answers

    What is an example of a physical interaction device used in human-computer interaction?

    <p>Haptic device</p> Signup and view all the answers

    What is the primary function of the processing component of a computer system in relation to human-computer interaction?

    <p>To process data quickly</p> Signup and view all the answers

    What is an example of a computer system that can be held in one's hand?

    <p>PDA</p> Signup and view all the answers

    What is the primary function of a computer's output devices in relation to human-computer interaction?

    <p>To display output to the user</p> Signup and view all the answers

    What is the primary factor that affects the interaction in a computer system in terms of paper?

    <p>The type of paper used for input and output</p> Signup and view all the answers

    What is a characteristic of most computing today?

    <p>rapid feedback</p> Signup and view all the answers

    What is a common text entry device?

    <p>keyboards (QWERTY et al.)</p> Signup and view all the answers

    What is a limitation of the QWERTY layout?

    <p>it is not faster for trained typists</p> Signup and view all the answers

    What is an alternative to the QWERTY layout?

    <p>alphabetic layout</p> Signup and view all the answers

    What is a characteristic of interactive computing?

    <p>user in control</p> Signup and view all the answers

    What is a device that allows for rapid entry of text?

    <p>keyboard (QWERTY et al.)</p> Signup and view all the answers

    What is a common input device?

    <p>USB memory</p> Signup and view all the answers

    What is the main advantage of the Dvorak keyboard layout?

    <p>It reduces fatigue and improves speed by 10-15%</p> Signup and view all the answers

    What is a characteristic of modern computing?

    <p>richer interaction</p> Signup and view all the answers

    What is the main benefit of chord keyboards?

    <p>They are more compact and portable</p> Signup and view all the answers

    What is the main limitation of T9 predictive entry?

    <p>It has limited vocabulary</p> Signup and view all the answers

    What is the primary technical problem in handwriting recognition?

    <p>All of the above</p> Signup and view all the answers

    What is the primary advantage of using a pen and digitizing tablet?

    <p>It's more natural and intuitive</p> Signup and view all the answers

    What is the primary characteristic of the Maltron keyboard?

    <p>It's designed for left-handed users</p> Signup and view all the answers

    What is the primary limitation of chord keyboards?

    <p>They are prone to fatigue</p> Signup and view all the answers

    What is the primary advantage of using a stylus on a touch-sensitive screen?

    <p>It's more accurate than finger input</p> Signup and view all the answers

    What is a system sequence diagram?

    <p>A fast and easily created artifact that illustrates input and output events</p> Signup and view all the answers

    What is system behavior?

    <p>A description of what a system does, without explaining how it does it</p> Signup and view all the answers

    What is the purpose of a system sequence diagram?

    <p>To illustrate input and output events related to the system</p> Signup and view all the answers

    What is a characteristic of a system sequence diagram?

    <p>It is a fast and easily created artifact</p> Signup and view all the answers

    What is the scope of a system sequence diagram?

    <p>It illustrates input and output events related to the system</p> Signup and view all the answers

    Study Notes

    Positioning, Pointing, and Drawing

    • Handheld pointing devices: mouse, touchpad, trackballs, joysticks, touch screens, tablets, and eyegaze
    • Mouse characteristics: planar movement and buttons (usually 1-3)
    • Mouse located on desktop, requires physical space, no arm fatigue, and is an indirect manipulation device

    The Mouse

    • Relative movement is detectable, moves screen cursor, and is oriented in (x, y) plane
    • Methods for detecting motion: mechanical and optical
    • Mechanical method: ball on underside of mouse turns, rotating orthogonal potentiometers
    • Optical method: light emitting diode on underside of mouse, detects fluctuating alterations in reflected light intensity
    • Foot-operated mouse experiments exist, but are not common

    Touchpad

    • Small touch-sensitive tablets used mainly in laptop computers
    • Acceleration settings are important: fast stroke for lots of pixels per inch moved, initial movement to the target
    • Slow stroke for accurate positioning

    Trackball and Thumbwheels

    • Trackball: ball rotated inside static housing, indirect device, fairly accurate, separate buttons for picking
    • Thumbwheels: for accurate CAD, two dials for X-Y cursor position; for fast scrolling, single dial on mouse

    Joystick and Keyboard Nipple

    • Joystick: indirect, pressure of stick equals velocity of movement, buttons for selection
    • Keyboard nipple: miniature joystick in the middle of the keyboard for laptop computers

    Touch-sensitive Screen

    • Detects the presence of finger or stylus on the screen using interrupting light beams, capacitance changes, or ultrasonic reflections
    • Direct pointing device, advantages: fast, no specialized pointer needed, suitable for hostile environments
    • Disadvantages: finger can mark screen, imprecise, difficult to select small regions or perform accurate drawing

    Stylus and Light Pen

    • Stylus: small pen-like pointer to draw directly on screen, uses touch-sensitive surface or magnetic detection
    • Light Pen: now rarely used, uses light from screen to detect location
    • Both: direct, obvious to use, but can obscure screen

    Digitizing Tablet

    • Mouse-like device with cross hairs, used on special surface, very accurate, used for digitizing maps

    Positioning, Pointing, and Drawing

    • Handheld pointing devices: mouse, touchpad, trackballs, joysticks, touch screens, tablets, and eyegaze
    • Mouse characteristics: planar movement and buttons (usually 1-3)
    • Mouse located on desktop, requires physical space, no arm fatigue, and is an indirect manipulation device

    The Mouse

    • Relative movement is detectable, moves screen cursor, and is oriented in (x, y) plane
    • Methods for detecting motion: mechanical and optical
    • Mechanical method: ball on underside of mouse turns, rotating orthogonal potentiometers
    • Optical method: light emitting diode on underside of mouse, detects fluctuating alterations in reflected light intensity
    • Foot-operated mouse experiments exist, but are not common

    Touchpad

    • Small touch-sensitive tablets used mainly in laptop computers
    • Acceleration settings are important: fast stroke for lots of pixels per inch moved, initial movement to the target
    • Slow stroke for accurate positioning

    Trackball and Thumbwheels

    • Trackball: ball rotated inside static housing, indirect device, fairly accurate, separate buttons for picking
    • Thumbwheels: for accurate CAD, two dials for X-Y cursor position; for fast scrolling, single dial on mouse

    Joystick and Keyboard Nipple

    • Joystick: indirect, pressure of stick equals velocity of movement, buttons for selection
    • Keyboard nipple: miniature joystick in the middle of the keyboard for laptop computers

    Touch-sensitive Screen

    • Detects the presence of finger or stylus on the screen using interrupting light beams, capacitance changes, or ultrasonic reflections
    • Direct pointing device, advantages: fast, no specialized pointer needed, suitable for hostile environments
    • Disadvantages: finger can mark screen, imprecise, difficult to select small regions or perform accurate drawing

    Stylus and Light Pen

    • Stylus: small pen-like pointer to draw directly on screen, uses touch-sensitive surface or magnetic detection
    • Light Pen: now rarely used, uses light from screen to detect location
    • Both: direct, obvious to use, but can obscure screen

    Digitizing Tablet

    • Mouse-like device with cross hairs, used on special surface, very accurate, used for digitizing maps

    The Computer

    • A computer system consists of various elements that affect interaction, including input devices, output devices, virtual reality, physical interaction, paper, memory, and processing.

    Interacting with Computers

    • To understand human-computer interaction, it's essential to understand what computers can do, including their devices, paper, sensors, memory, processing, and networks.

    A Typical Computer System

    • A typical computer system consists of an screen, keyboard, and mouse/trackpad, with variations such as desktop, laptop, and PDA.
    • The devices used dictate the styles of interaction that the system supports.

    Prevalence of Computers

    • Computers are ubiquitous, with many devices in our homes and pockets, including PDAs, PCs, laptops, phones, cameras, TVs, and more.

    Interactivity

    • Long ago, computing was based on batch processing, but now most computing is interactive, with rapid feedback and user control.
    • Interactivity allows users to do rather than think.

    Richer Interaction

    • Modern computing involves richer interaction, with sensors and devices everywhere.

    Text Entry Devices

    • Text entry devices include keyboards, chord keyboards, phone pads, and handwriting/speech recognition devices.

    Keyboards

    • Keyboards are the most common text input device, allowing rapid entry of text by experienced users.
    • Keyboards have a standardized layout, such as QWERTY, but alternative designs are available.

    QWERTY Layout

    • The QWERTY layout is not optimal for typing, as it was designed to prevent typewriter jamming.
    • Alternative designs, such as Dvorak, offer faster typing and reduced fatigue, but are not widely adopted due to the large social base of QWERTY typists.

    Alternative Keyboard Layouts

    • Alternative layouts, such as alphabetic and Dvorak, offer improved typing speed and reduced fatigue.
    • Special keyboards, such as those designed for single-handed use or to reduce fatigue, are also available.

    Chord Keyboards

    • Chord keyboards have a few keys and use combinations of keypresses to type letters.
    • They are compact, easy to learn, and fast, but may cause fatigue and face social resistance.

    Phone Pad and T9 Entry

    • Phone pads and T9 entry use numeric keys with multiple presses to type letters.
    • T9 predictive entry uses a dictionary to guess the correct word, allowing fast typing.

    Handwriting Recognition

    • Handwriting recognition allows text input using a pen and a digitizing tablet.
    • Technical problems include capturing useful information, segmenting joined up writing, and interpreting individual letters.
    • Handwriting recognition is used in PDAs and tablet computers.

    The Computer

    • A computer system consists of various elements that affect interaction, including input devices, output devices, virtual reality, physical interaction, paper, memory, and processing.

    Interacting with Computers

    • To understand human-computer interaction, it's essential to understand what computers can do, including their devices, paper, sensors, memory, processing, and networks.

    A Typical Computer System

    • A typical computer system consists of an screen, keyboard, and mouse/trackpad, with variations such as desktop, laptop, and PDA.
    • The devices used dictate the styles of interaction that the system supports.

    Prevalence of Computers

    • Computers are ubiquitous, with many devices in our homes and pockets, including PDAs, PCs, laptops, phones, cameras, TVs, and more.

    Interactivity

    • Long ago, computing was based on batch processing, but now most computing is interactive, with rapid feedback and user control.
    • Interactivity allows users to do rather than think.

    Richer Interaction

    • Modern computing involves richer interaction, with sensors and devices everywhere.

    Text Entry Devices

    • Text entry devices include keyboards, chord keyboards, phone pads, and handwriting/speech recognition devices.

    Keyboards

    • Keyboards are the most common text input device, allowing rapid entry of text by experienced users.
    • Keyboards have a standardized layout, such as QWERTY, but alternative designs are available.

    QWERTY Layout

    • The QWERTY layout is not optimal for typing, as it was designed to prevent typewriter jamming.
    • Alternative designs, such as Dvorak, offer faster typing and reduced fatigue, but are not widely adopted due to the large social base of QWERTY typists.

    Alternative Keyboard Layouts

    • Alternative layouts, such as alphabetic and Dvorak, offer improved typing speed and reduced fatigue.
    • Special keyboards, such as those designed for single-handed use or to reduce fatigue, are also available.

    Chord Keyboards

    • Chord keyboards have a few keys and use combinations of keypresses to type letters.
    • They are compact, easy to learn, and fast, but may cause fatigue and face social resistance.

    Phone Pad and T9 Entry

    • Phone pads and T9 entry use numeric keys with multiple presses to type letters.
    • T9 predictive entry uses a dictionary to guess the correct word, allowing fast typing.

    Handwriting Recognition

    • Handwriting recognition allows text input using a pen and a digitizing tablet.
    • Technical problems include capturing useful information, segmenting joined up writing, and interpreting individual letters.
    • Handwriting recognition is used in PDAs and tablet computers.

    System Behavior

    • System behavior describes what a system does, without explaining how it does it.
    • It includes a system sequence diagram as part of its description.

    System Sequence Diagram

    • A system sequence diagram is a fast and easily created artifact.
    • It illustrates input and output events related to the systems under discussion.

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    Description

    This quiz covers human computer interaction concepts, specifically focusing on input devices such as mice, touchpads, trackballs, and others. It explores the characteristics of these devices and their uses.

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