Indirect mappings of multi-touch input using one and two hands

Touchpad and touchscreen interaction using multiple fingers is emerging as a valuable form of high-degree-of-freedom input. While bimanual interaction has been extensively stud-ied, touchpad interaction using multiple fingers of the same hand is not yet well understood. We describe two experi-ments on user perception and control of multi-touch inter-action using one and two hands. The first experiment ad-dresses how to maintain perceptual-motor compatibility in multi-touch interaction, while the second measures the sep-arability of control of degrees-of- freedom in the hands and fingers. Results indicate that two-touch interaction using two hands is compatible with control of two points, while two-touch interaction using one hand is compatible with control of a position, orientation, and hand-span. A slight advan-tage is found for two hands in separating the control of two positions. Author Keywords Multi-touch input, bimanual interaction, high-degree-of