Professor Richard Abadi (MSc, PhD) - research
Eye Movements and Perception
Visual perception requires the detection, localisation and recognition of objects in space. Once captured on the fovea the image must remain at rest. In order to cope with these every day tasks a number of oculomotor systems have evolved to shift the eyes or to hold them steady. Our group has therefore directed its attention to studying the programming, initiation and execution of fast and slow eye movements. We have developed sophisticated high resolution recording and analytical techniques and used them to explore oculomotor control to a wide range of visual stimuli. Of particular interest to our group is the way retinal image motion can affect visual performance and whether afoveate humans such as albinos have a modified oculomotor control system. Image stabilising systems, such as the optokinetic system, have been extensively studied to determine the role of the cortical and subcortical pathways. The effects of congenital and acquired nystagmus on visual performance has remained a long-term research project. This has led to a greater understanding of the aetiology, development and control of the nystagmus.
Currently, we are engaged in studies exploring the effect of retinal image slip on spatial and temporal detection and discrimination, the adaptive changes in egocentric localisation and gaze-holding, congenital and acquired nystagmus, the programming of slow and fast eye movements, the mechanisms underlying fixation control in normal and visually deprived systems (e.g. congenital cataract) and the use of dynamical systems analysis to understand the behaviour of the oculomotor control system.