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Prompted by the increasing popularity of smartphones, we experimentally investigated how command button size and spacing influences users' operation and experience of the device. We measured user performance (input accuracy and operation time) and assessed physiological and psychological reactions. Tests were performed for a range of button sizes, spacing and handling modes. While large button size (9 mm) increased user comfort, a size of 7 mm aroused more user excitement, suggesting that user-interface design guidelines should be revised for uses such as games and amusement.

Optimization of GUI on Touchscreen Smartphones Based on Physiological Evaluation – Feasibility of Small Button Size and Spacing for Graphical Objects