Associate Professor, Department of Psychology
B.S. Texas A&M University
Office: 331 LISB
Research Interests: Neural basis of sensation and perceptual awareness; sensorimotor integration
Overview: The general goal of our research is to understand the brain's ability to perceive and interact with objects in the environment. In one line of research, we are attempting to define the patterns of brain activity that correspond to a subject's awareness of visual stimuli. In other words, why are we aware of some objects and events in the world around us, but not others? For these studies, we use behavioral methods and functional magnetic resonance imaging (fMRI) to examine brain activation as human subjects observe illusory visual stimuli.
In a second line of research, we focus on the brain's ability to form spatial representations of the world using sensory cues. In particular, this research uses behavioral techniques to examine the many possible frames of reference used by the brain to map the location of an object in three-dimensional space. By assessing the performance of human subjects responding to sensory stimuli under various conditions, these experiments provide insights into the sensorimotor processes that allow us to accurately move the eyes or hands to the location of an object.
The Roelofs and induced Roelofs effects.
Conscious Cogn. 2018 Jun 06;:
Authors: Bridgeman B, Dassonville P, Lester BD
The visual image provides important cues for an observer's sense of location and orientation within the world. Occasionally, though, these cues can be misleading, resulting in illusions. In the Roelofs and induced Roelofs effects, for example, a large illuminated frame, offset from the observer's midline in otherwise complete darkness, tends to bias the observer's judgment of straight ahead, causing the position of the frame, and anything contained within it, to be misperceived. Studies of these illusions have provided much insight into the processes that establish an observer's egocentric reference frame, and the manner in which object locations are encoded relative to this frame for perception and action.
PMID: 29886012 [PubMed - as supplied by publisher]