user based at least partly on the signals either being outside of an operational range and/or within a null space for signals associated with the sensors during performance of the task. For example, combinations of signals within an operational range may not be associated with a command, while combinations of signals within a null space and/or outside of an operational range may be associated with a command from the user to the system. [0039] FIGs. 3A-3D show different combinations of sensor activations that may be used to provide operating commands to a system. In some embodiments, a sensor may be disposed on each fingertip of a user. Each sensor may be configured to be either “on” 302 (represented by a black circle in FIGs. 3A-3D) or “off” 304 (represented by a white circle in FIGs. 3A-3D). As described above, a sensor may be considered “on” when it produces a signal that is greater than a predetermined threshold. Of course, other embodiments in which continuous signals are used are contemplated, and the disclosure is not limited in this regard. In embodiments in which a user wears multiple sensors, the user may be able to turn each sensor “on” or “off” individually. Different arrangements of sensor activation (i.e., different combinations of which sensors are “on” and which sensors are “off”) may be used to communicate different commands to a system. FIG. 3A shows a scenario in which both left and right thumb sensors are “on”, and all remaining finger sensors are “off”. This arrangement of sensor activation may correspond to a first command. FIG. 3B shows a scenario in which both left and right pointer finger sensors are “on”, and all remaining finger sensors are “off”. This arrangement of sensor activation may correspond to a second command. FIG. 3C shows a scenario in which both left and right pinky finger sensors are “on”, and all remaining finger sensors are “off”. This arrangement of sensor activation may correspond to a third command. Finally, FIG. 3D shows a scenario in which both left and right middle finger sensors are “on”, and all remaining finger sensors are “off”. This arrangement of sensor activation may correspond to a fourth command. While the above- described examples include two activated sensors, including one sensor from corresponding fingers of each hand, other arrangements of sensor activation are possible. In some embodiments, a command may correspond to one, two, three, four, five, six, seven, eight, nine, ten, or any appropriate number of activated sensors. In some embodiments, a command may correspond to asymmetric activation of sensors between two hands. For example, a code