The observer scans the visual environment by directing attention through ballistic eye movements known as saccades. A saccadic event automatically induces ‘saccadic suppression’ in which the visual image is largely suppressed, and the observer is temporarily ‘blind’ to the visual world when the eyes are in motion. This is necessary to reduce motion induced blur/smear which would otherwise affect image clarity. However, in patients with ocular disease, eye movements are known to be impaired, which might suggest that saccadic suppression might be altered by disease processes.
The aim of the proposed project is to investigate possible changes in saccadic suppression in vision simulation normal individuals with visual field loss simulated using visual aids. We will conduct a computer experiment in which the detectability (i.e., contrast) of a stimulus briefly presented at different intervals around the time of a saccade will be measured. An eye tracker will also be used to measure eye movements during the data collection process. From these data we will be able to determine the extent (i.e. duration) and how much saccadic suppression might occur in patients with ocular disease.
Areas of Student Interest
- Vision Science
Lead Academic: Dr Sieu Khuu
Sieu's research is primarily focused in the discipline of visual perception with emphases on cognitive and visual neuroscience. This research seeks to understand the computational rules underlying the extraction and processing of visual information and how this information is used by the visual system to aid visually guided behaviour. This research focuses on the following areas: 1) To contribute to the understanding of visual perception with emphasis on the computational processes that underlies the perception of 3D motion and form. 2) To understand how the visual system detects image contrast, and how efficient and focused measures of this visual function can be applied to vision screening and the diagnosis of visual dysfunction.
PhD Student: Revathy Mani
Revathy Mani is a PhD candidate at the School of Optometry and Vision Science, UNSW Sydney. Her area of research is to understand the relationship of saccadic eye movements and cognitive deficits in Traumatic Brain Injury. She received her undergraduate and master’s degree from Elite School of Optometry, India. She is a fellow of American Neuro-Optometric Rehabilitation Association. She has substantial history of academic and research contribution over 10 years. She teaches undergraduate vision science and binocular vision practical sessions at UNSW.