Vu reported on her studies of people’s performance under different levels of stimulus-response compatibility. For example, high stimulus response compatibility occurs when a blinking button needs to be pressed. The blinking is the stimulus and the button press is the response. They become less compatible as the signal for pressing the button moves further from the button itself. In the worst case, a well learned response is reversed – imagine if moving your computer mouse to the right moved the cursor left. This would be terribly incompatible, but would be even worse if you were already well experienced with the mouse moving in a compatible manner.
Vu gave some great examples of how stimulus response compatibility is much more than common sense. In coal mining, the controls for a mine transport operate in one direction (a compatible one) going in to the mine and reverse when leaving. When controlling military drones visually (UAVs) or any remote controlled object, the input controls must be reversed when the machine is flying toward the controller. In my mouse example, it is not common sense for a mouse to work as it does — there is no universal compatibility that moving a mouse forward should move it upwards on the screen. Indeed, many flight input devices work in the opposite way, so that a forward movement makes the plane descend. This compatibility was learned, but nonetheless is disrupted when changed.
Dr. Vu is currently an Associate Professor at California State University, Long Beach, and working on incorporating stimulus-response compatibilities in 3-dimensional interfaces.
Congratulations to Dr. Vu on her award!
For some fun reading by Kim-Phuong Vu and Robert Proctor, see their review chapter on the state of our art:
Proctor, R. W., & Vu, K.-P. L. (2010). Cumulative knowledge and progress in human factors. Annual Review of Psychology (vol. 61). Palo Alto, CA: Annual Reviews.