Abstract: Methods and apparatus related to wearable devices (150) worn at a location on a user's body, which in response to execution of processor-executable instructions (120) detect for the user pose or motion and pose at location proximate to or more distally disposed to the wearable device (150). The apparatus (100) includes a wearable user interface device. The wearable device (150) via an associated processor (104) detects, at least, volume changes in a user's limb. The wearable device (150) generates gesture information from, at least one of, myographic force data, proximity data, and inertial measurement data. The wearable device (150) may be included in a larger apparatus (100). The wearable device (150) or larger apparatus (100) may include methods of operation in which at least one processor (105) generates gesture and/or extremity information and takes at least one tangible action based on the information.