Index

A

Absolute pressure, contact data, 194
Accelerator keys, primitives, 121–122
Accelerators
GUI tapping, 139
and keyboard, 179
number of contacts, 182–183
Accidental activation, feedback error, 85–86, 88–89
Activate gesture
ambiguity, 133
iPhone, 134t
Activation
false-positive, 212–213
feedback error, 85–86, 88–89
key strike velocity, 192
mouse, 68, 81, 82t
strength, 170f
successful NUIs, 226–227
time-based, 49
Activation event, feedback error, 85, 88–89
Adobe Photoshop, multi-finger interfaces, 182
Affordances
definition, 30
false-gesture recognition, 216, 217
scaffolding concept, 55
self-revealing gestures, 145, 152, 154f
Alt hotkeys
novice-to-expert transition, 149
Photoshop, 182–183
Animations
feedback visualization, ...

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