Are there any quantitative experiments that have studied (or that can be used to study) the usability of the trackpad vs the mouse, for the task of point and click?
Say, for example, that we choose as a usability metric the time it takes a user to move the mouse pointer to a specific location on the screen and click on it. Are humans more accurate (measurable in terms of speed) moving a finger on their trackpad to the desired location, or moving a mouse (assuming a modern mouse)?
What experiments/software can a user do to measure this? I imagine that a tool that places random boxes around the screen and that tracks the time it takes the user to click on them, on average, would suffice.