# Shared Flashcard Set

## Details

Human-Computer Interaction 14
HCI at University of Zürich
25
Computer Science
01/06/2017

Term
 What kind of interaction devices are there?
Definition
 [image]
Term
 What is an input device?
Definition
 Tansducer that senses physical properties of people, places or things
Term
 What is an interaction technique?
Definition
 Fusion of input and output, consisting of all hardware and software elements, that provides a way for the user to accomplish a task for a particular conceptual model
Term
 Characteristics of input devices
Definition
 - Physical properties sensed- Number of dimenstions- Direct vs indirect inputs- States sensed- Transfer functions- Other characteristics (sampling rate, footprint, homing time..)
Term
 Physical properties sensed
Definition
 [image]
Term
 What is a relative positioning device?
Definition
 use displacement vector as input signal -> turning computer off and on - > always starts at 0
Term
 Direct vs. Indirect
Definition
 Direct input devices unify input and display surfacesIndirect input devices have separate input and display surfaces
Term
Definition
 + no occlusion+ can have higher precision+ scales better for large output screens- Requires explicit representation (cursor)
Term
 Graphical input devices can be modeled with which three states?
Definition
 State 0: no effect, State1: Move cursor, State 2: Activatee.g. mouse: state 0: not moving the mouse, state 1 move cursor, state 2, button down (can still move cursor)
Term
 From input signal to output
Definition
 [image]
Term
 Proprioception
Definition
 sense relative position of neighboring parts in the body. e.g. feeling the position of own finger after moving on a trackpad
Term
 Extrerioception:
Definition
 sense outside stimuli- Feedback actively produced by the computer, e.g. seeing the cursor move- Feedback from the physical form of the manipulandum, e.g. feeling the solid surface of the trackpad
Term
 Transfer function
Definition
 Mathematical relationship between input space and display space- Identical transformation I(x), e.g., touch screens- Linear transformation, e.g. mouse, trackpad
Term
 CD gain
Definition
 Control-display gain[image]
Term
 Pointer acceleration
Definition
 dynamically changing CD gain according to the movement velocityprimary submovement -> fast -> trigger high CD gain -> quickly cover a distancesecondary submovememtn -> slow -> trigger low CD gain -> precise cursor control
Term
 how we move while pointing?
Definition
 primary submovement: ballistic (don't use visual feedback for adjusting the course), relatively high velocitysecondary submovemet: corrective, use visual feedback, relatively low velocity
Term
 Formally representing input devices: primitive movement vocabulary
Definition
 [image]
Term
 What does the M stand for in the primitive input device formula? What are the possibilities?
Definition
 [image]
Term
 What does ln and Out stand for in the primitive input device formula?
Definition
 [image]
Term
 What does the S, R stand for in the primitive input device formula?
Definition
 [image]
Term
 What the W stand for in the primitive input device formula?
Definition
 [image]
Term
 What is the second possibility to formally represent input devices?
Definition
 composition operators[image][image]
Term
 Composition operators shown graphically
Definition
 [image][image]
Term
 What is the use of a design space of input devices?
Definition
 [image]
Term
 How is speed measured in text entry devices?
Definition
 [image]
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