Spatial distortions in persistent and temporary tactile landmarks
Tue-A6-Talk V-06
Presented by: Paula Soballa
Landmarks influence spatial perception in multiple ways. For example, localizations of targets show less variability near landmarks, and spatial distortions towards the landmarks, the landmark attraction effect, have been reported. Crucially, most studies used shortly presented landmarks which stands in contrast with our everyday experiences where we are more used to persistent landmarks (e.g., environmental landmarks such as buildings or anatomical landmarks such as joints). We turn to the tactile modality, which allows us to compare artificially applied, short-term landmarks (locally applied tactile stimulation) with environmental, persistent landmarks (elbow and wrist). With a tactile experimental set-up, we presented artificial landmarks on the skin along the left forearm and across three experiments (each N = 24), systematically manipulated the location of the artificial landmark to differentiate between the effects of artificial and environmental landmarks. Whereas artificial landmarks produced a pattern of landmark attraction when the influence of environmentallandmarks was minimized, we did not find an additive landmark attraction effect when artificial and environmentallandmarks were presented in close proximity. Rather, a landmark repulsion was observed in this case, which raises questions about the transferability of results with shortly presented, artificial landmarks in the laboratory to more natural settings with persistent landmarks.
Keywords: Landmark attraction, tactile localization, spatial distortions