DescriptionVisual perception is a reconstruction of the physical visual aspects of the world and subject to various biases, assumptions and noise. One aspect of visual perception is visuospatial localization. Although visual localization is typically accurate, there are various situations where healthy human subjects mislocalize objects, as well as, neurological disorders that alter visual localization behavior. These situations result in differences between the perceived and actual position of an object. These perceptual errors are useful to explore the limitations of visuospatial object localization and provide information on the underlying neural mechanisms of position perception. In particular, the following studies investigated how the brain integrates visual information across a spatially extended stimulus and ultimately results in a final percept of position. This project utilized behavioral and fMRI studies combined with transcranial direct current stimulation (tDCS) in healthy human subjects. These methods allowed us to quantify behavioral errors in localization and examine changes in the BOLD signal (as an indirect measure of changes in neural activity) in potential neural correlates of position perception. In Aim 1 we show that factors such as retinal eccentricity and attentional cues bias localization behavior via alterations of the contribution of specific object components in the integration process. Aim 2 shows that tDCS over posterior parietal cortex (PPC) yields mislocalizations that are consistent with predictions from the interhemispheric competition theory (ICT) of attention. This supports the causal role of PPC in visual spatial localization. Aim 3 extends the results from Aim 2 to show that the BOLD signal changes in PPC predict localization behavior. In addition to novel insights related to position perception, these experiments provide insight into the effects of tDCS on behavior and the interaction of tDCS with the BOLD signal. This work begins to answer how different factors influence position perception and the role of different cortical regions in position perception. This research also has implications for rehabilitation programs for patients with various visual neurological disorders that alter spatial perception.