This is useful for clearing out the cached movement features in the Motor Module or the currently-attended object and location in the Vision Module, for example. Note that this call is not necessary since it can implicitly be called in the LHS of a production. Moves attention and categorizes features at the location given by loc , which should be a chunk of type visual-location . The phrase scale value will read a bunch of text sharing a common vertical location with the attended location, and will produce a chunk representing a phrase of words. When this command is executed, the Vision Module will begin tracking the screen object corresponding to the visual-object specified by object .
Tracking stops when a move-attention or clear command is issued.
Note that the hand must already be on the mouse, if not, a warning message is printed. Movement is actually done with a ply movement, taking time based on Fitts' Law. Direction is in polar coordinates, with 0 set to move right along the x-axis. Same as a peck, but the finger is returned to its original location. Sometimes, the hand needs to be repositioned on the keyboard, which is what this call does.