The 3 different types of mental resources (below) require different mental load. Visual requires more than motor, and cognitive requires the most mental load of all.
Motor (least effort): pressing buttons, moving the mouse, etc.
Visual: see things and take them in
Cognitive (most effort): thinking, remembering, making decisions
“One of the best ways to create a good user experience: reduce cognitive load.”
A good experience is the result of reducing mental resources—especially cognitive load.
The question often arises about whether to have a long page or a series of smaller pages you have to click to navigate through. Scrolling is a motor skill—it takes less brain power and is less tiring than clicking through smaller screens where each click requires a cognitive process to think about what to do.
Originally published on http://blog.invisionapp.com/