This attribute is used to note whether attendable visual objects exist in any of the specified directions. This allows for a general "attend-to-nearest-in-X-direction" proposal without the ability to discern nearest and furthest pre-attentively.
Substructure of the attribute:
(<top-state> ^targets-available ul l dl u c d ur r dr)Any or all of the constants listed may be present at any time. The attribute is maintained by the encoding production top*augs*attention-targets-available in the file encode.soar6.