Provided is a touch-sensitive input apparatus including a capacitive sensor with a plurality of adjacent capacitive, touch-sensing regions for detecting a foreign object in close proximity to a surface of the capacitive sensor. The foreign object can be brought into contact with, or at least in close proximity to the surface to enter an instruction for controlling a device associated with the touch-sensitive input apparatus. A controller receives a signal indicative of a capacitance sensed by a first region included in the plurality of touch-sensing regions during application of a shield signal to a second region included in the plurality of touch-sensing regions. The second region is located adjacent to the first region.