3461 SR Compatibility

3461 SR Compatibility  S = Stimulus, the input device that is being manipulated or stimulated  R = Response, the visual, aural, or kinesthetic sense that is affected by the stimulus  Compatibility refers to the correctness of the match between the stimulus and the response

3461 Senses  Visual  Aural  Kinesthetic Sensory experience derived from bodily movements and tensions

3461 Example – Cursor Control (1D) Stimulus Response Wrist and/or arm movement

3461 Example – Object Manipulation (1D) Stimulus Response

3461 Example – Object Manipulation (2D) Stimulus Response Stimulus Response

3461 The Issue  In 2D there are 3 dof (degrees of freedom)  x position or displacement  y position or displacement   Z – z-axis angle or rotation  A mouse is a 2 dof device  Senses x displacement  Senses y displacement  Does not sense z-axis rotation  The problem: generating z-axis rotation data with a mouse

3461 Solution #1 – Rotate Tool Step #1 – acquire object, move mouse Step #2 – click on rotate tool (enable rotate mode) or ? Step #3 – acquire object, move mouse

3461 Solution #2 – Build a 3 dof Mouse Stimulus Response Step #1 – acquire object, move mouse

3461 Solution #2 – MacKenzie did it. (MacKenzie, Soukoreff, & Pal, 1997)  Two-ball mouse with 3 degrees of freedom

3461

Design Issues for 3 dof Mouse  Switching between 2 dof and 3 dof modes  Solution: use a modifier key (e.g., SHIFT) to enable 3 dof mode  Yielding 360° of rotation from limited wrist movement  Solution: use a modifier key (e.g., CTRL to “amplify” rotational mapping

3461 3D Interaction (6 dof) ?

3461 Multiple Degree-of-Freedom Input Devices Ph.D. Research on human coordination

3461 BMW 7 Series - iDrive

3461 SR Compatibility & Cultural Bias Stimulus (switch) Response (switch) Question: Is the light on or off? Answer: Off (in England) On (in Canada)

3461 SR Compatibility in User Interfaces Press me Visual feedback? Aural feedback? Kinesthetic feedback? Visual feedback? Aural feedback? Kinesthetic feedback?   Works pretty good, eh?

3461 Stimulus vs. Response – setting time What does this button do? Answer: moves the selected field “backward” in time.

3461 Yes, but… “up” = earlier “down” = later

3461 Responsiveness

3461 Computer Speed Two kinds of computer speed  real (machine- Hz) speed (performance)  perceived speed (responsiveness) Galitz, W. O., (2002) The Essential Guide to User Interface Design, 2nd Edition, Wiley Computer Publishing, New York, NY. Perceived speed is the one that matters.

3461 Responsiveness in Design (1 of 3) “I’d like to fly from Toronto to Ottawa next Thursday, returning Sunday evening, as inexpensively as possible. [25 minute wait on the telephone before the agent answers] “I have a flight on Air Canada leaving at...”

3461 Responsiveness in Design (2 of 3) “I’d like to fly from Toronto to Ottawa next Thursday, returning Sunday evening, as inexpensively as possible. “OK, I’ll check the flights and fares and call you back within half an hour.”

3461 Responsiveness in Design (3 of 3) Always respond immediately to the user’s request, even if the final answer is not yet available. Provide feedback in the form of progress bars/busy indicator for function with a delay greater than 1 second. Johnson, Jeff, (2000) GUI Bloopers. Morgan Kaufmann

3461 Thank you