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My research on visual attention shifting is influenced, in part, by Pylyshyn’s proposal that there is a limited number (4 or 5) of spatial index tokens that can be used by intermediate-level routines to mark and maintain information about object locations while visual tasks are carried out. In particular, I have proposed that spatial indexes similar to those described by Pylyshyn play an important role in the encoding of attention shift destinations, saccade destinations, and previously examined locations (inhibition of return). One prospect of this work is the possibility of a better understanding of visual phenomena related to attention and eye movements that can be affected in a goal-driven and a stimulus-driven manner. Inhibition of return is one example (see Wright & Richard, 1998) and express saccades are another (see Wright & Ward, 1998). Like intermediate-level vision, both appear to be primarily stimulus-driven, but the occurrence of both can be influenced in a goal-driven manner as well. My future research will continue to focus on the relationship between intermediate-level operations such as spatial indexing and attentional analysis. |
