Interplay Between Visual and Spatial: The Effect of Landmark Descriptions on Comprehension of Route/Survey Spatial Descriptions

Successful wayfinding requires accurate encoding of two types of information: landmarks and the spatial relations between them (e.g., landmark X is left/north of Y). Although both types of information are crucial to wayfinding, behavioral and neurological evidence suggest that they have different substrates. In this paper, we consider the nature of the difference by examining comprehension times of spatial information (i.e., route and survey descriptions) and landmark descriptions. In two studies, participants learned simple environments by reading descriptions from route or survey perspectives, half with a single perspective switch. On half of the switch trials, a landmark description was introduced just prior to the perspective switch. In the first study, landmarks were embellished with descriptions of visual details, while in the second study, landmarks were embellished with descriptions of historic or other factual information. The presence of landmark descriptions did not increase the comprehension time of either route or survey descriptions, suggesting that landmark descriptions are perspective-neutral. Furthermore, visual landmark descriptions speeded comprehension time when the perspective was switched, whereas factual landmark descriptions had no effect on perspective switching costs. Taken together, the findings support separate processes for landmark and spatial information in construction of spatial mental models, and point to the importance of visual details of landmarks in facilitating mental model construction.