Mohammed Alnawmasi

PhD Candidate

Name:  Mohammed Alnawmasi

Research Title: Visual attention following traumatic brain Injuries (TBI)

Supervisors: Associated Professor Sieu Khuu, Dr Lisa Asper


Traumatic brain injury (TBI) caused by trauma to the brain from an external force is one of the most commonly occurring neurological disorders. Due to contact injury, focal brain injury can occur in any area on the brain and can be accompanied with or without diffuse brain damage. TBI is usually associated with a variety of cognitive deficits, mostly attention and memory deficits.  TBI is also accompanied by visual deficits such as deficits in accommodation, vergence, versions, and visual field. However, deficits in the cognitive aspects of vision such as visual attention has not been well studied following TBI. Visual attention is a cognitive process in which there is a voluntary direction of attention to a specific location or specific object/objects.

Visual attention comprises of several important components or aspects. These aspects reflect different strategies or means through which attention is allocated and utilized to process information. Attention can be selective, which refers to refers to the ability to choose relevant visual information and ignoring irrelevant information at the same. Secondly, visual attention can be divided and refers to the ability to attend to more than one stimulus at the same time. Finally, attention can be sustained and relates to the ability to maintain attention to a specific visual stimulus/stimulus over time without fluctuation in performance.

Current, I am working on a project that focusses on whether and how these different aspects of visual attention are affected following TBI. The project is essentially will be conducted to assess subjectively visual attention using different tasks as well as objectively by monitoring the eye movement.


Mohammed completed his Doctor of Optometry degree (OD) at the College of Applied Medical Sciences, Department of Optometry, at Qassim University. He also completed a master’s degree in Vision Science at the University of Waterloo. Currently, Mohammed is a PhD student work within the Psychophysics Lab on a study entitled “Visual Attention following traumatic Brain Injuries”. Mohammed uses a variety of techniques such as psychophysics and eye tracking to measure and assess visual attention.


Doctor of Optometry degree (OD), Qassim University, Saudi Arabia (2013)

Master’s degree on Vision Science, University of Waterloo, Canada (2018)

Recent Publications

The effect of mild traumatic brain injury on the visual processing of global form and motion, Brain Injury Journal

Affiliations and Memberships

College of Applied Medical Sciences, Department of Optometry, Qassim University