15:00 - 16:30
Tue—Casino_1.811—Poster2—56
Tue-Poster2
Room:
Room: Casino_1.811
The Spatial Specificity and Recovery of Visual Adaptation in Causal Perception
Tue—Casino_1.811—Poster2—5602
Presented by: Laura van Zantwijk
Laura van Zantwijk *Martin RolfsSven Ohl
Department of Psychology, Humboldt-Universität zu Berlin, Germany
Humans report a vivid and automatic impression of causality in launching events, in which one object approaches a stationary second object, and the second objects starts moving in the same direction after the two objects collide. Visual adaptation can alter this perception of causality (Rolfs et al., 2013): In ambiguous test events, fewer launches are reported after viewing a stream of launch events. In the planned study, we aim to determine 1) the spatial specificity of this effect and 2) how the perception of causality recovers from adaptation. Observers will be presented with ambiguous test events ranging from launching to passing events by manipulating the disc overlap of these two objects. Critically, we collect the proportion of reported launches before, during, and after adapting to launching events. To measure the spatial specificity of visual adaptation, events are presented at five different horizontal locations (–3, –1.5, 0, 1.5, 3 dva from the adapted location). We predict that the adaptation will be specific to the adapted location, vanishing with distance from the adapted location. Moreover, we predict that observers will perceive fewer launches during adaptation as compared to before, and after adaptation. By testing the magnitude of adaptation in different experimental phases, we will determine the timecourse and completeness of the recovery after adaptation. These results will help us reveal the spatiotemporal adaptation profile for the perception of causality and allow us to contrast it with known adaptation responses to well-established low-level features in the visual system.
Keywords: causality, visual adaptation, perception