Glass patterns (GPs) are visual patterns consisting of dipoles arranged to form different configurations. GPs have been widely employed to investigate the mechanisms underlying processing of global form. The current study aimed to investigate the level at which global orientation is extracted from translational GPs by using an adaptation paradigm and manipulating the spatiotemporal properties of the adapting translational GP and test sinewave grating used. Two experiments were carried out to assess the spatial and temporal tuning of the tilt-aftereffect (TAE) from GP adaptation. In Experiment 1, the temporal frequency selectivity of the TAE was investigated, using both static and dynamic GPs. Experiment 2 investigated the spatial frequency tuning of the TAE from GP. The results found that the TAE from adaptation to GPs is temporally tuned, peaking at ~37 Hz, and spatially tuned, peaking at lower frequencies than those of the spatially constant dipoles. These results suggest that the TAE from translational GPs is processed by neurons that are orientation selective, these neurons are tuned to low-spatial frequencies and that can integrate motion and form signals at intermediate temporal frequencies. The effects we reported point to low and intermediate levels of global form processing and motion-form integration.
PLEASE NOTE: You must be a member of the University of Lincoln to be able to view this dissertation. Please log in here.