A5062353209- Spatial Neglect and Hemispheric Dysfunction
- Visual perception and processing mechanisms
- Motor Control and Adaptation
- Vestibular and auditory disorders
- Ophthalmology and Eye Disorders
- Musculoskeletal pain and rehabilitation
- Neural and Behavioral Psychology Studies
- Hemispheric Asymmetry in Neuroscience
- Transcranial Magnetic Stimulation Studies
- Face Recognition and Perception
- Neurology and Historical Studies
- Stroke Rehabilitation and Recovery
- Memory Processes and Influences
- Hallucinations in medical conditions
- Neural dynamics and brain function
- Glaucoma and retinal disorders
- Intelligent Tutoring Systems and Adaptive Learning
- Behavioral Health and Interventions
- EEG and Brain-Computer Interfaces
- Tactile and Sensory Interactions
- Multisensory perception and integration
- Face recognition and analysis
- Decision-Making and Behavioral Economics
- Cognitive and developmental aspects of mathematical skills
- Muscle activation and electromyography studies
MacEwan University
2012-2024
University of Alberta
2015-2024
Women and Children’s Health Research Institute
2015-2023
Western University
2009-2015
Glenrose Rehabilitation Hospital
2015
University of Waterloo
2006-2010
Canadian Institutes of Health Research
2009
Inserm
2007
Université Claude Bernard Lyon 1
2007
Heart and Stroke Foundation
2007
Traditionally the cerebellum has been known for its important role in coordinating motor output. Over past 15 years numerous studies have indicated that plays a variety of cognitive functions including working memory, language, perceptual functions, and emotion. In addition, recent work suggests regions involved eye movements also play controlling covert visual attention. Here we investigated whether are not strictly tied to control might contribute To address this question examined effects...
Recent neuroimaging and neuropsychological studies have suggested that the right hemisphere, particularly frontal regions, is important for perception of passage time. We examined ability to estimate durations up 60 sec in a group eight patients with unilateral neglect. When estimating multisecond intervals, neglect grossly underestimated all durations. On average, healthy controls (HC) demonstrated reasonably accurate estimates tested. Although hemisphere lesioned control without also...
Prism adaptation reduces some symptoms of neglect; however the mechanisms underlying such changes are poorly understood. We suggest that prisms influence neglect by acting on dorsal stream circuits subserving visuomotor control, with little perceptual aspects neglect. examined prism in three patients and a group healthy controls line bisection landmark tasks. Neglect showed dramatic reduction rightward bias for bisection, but absolutely no change their leftward task, which is equivalent to...
Recent research has shown that prism adaptation alleviates some of the symptoms neglect. Although can aid patients with neglect, mechanisms underlying these benefits remain largely unknown. One way in which prisms may work is by altering attentional orienting known to be impaired To investigate this hypothesis, we tested four right brain damaged (two neglect) on a reflexive covert attention task before and after rightward compared them group healthy controls who underwent sham adaptation....
When we reach toward objects, easily avoid potential obstacles located in the workspace. Previous studies suggest that obstacle avoidance relies on mechanisms dorsal visual stream posterior parietal cortex. One fundamental question remains unanswered is where inputs to these dorsal-stream are coming from. Here, provide compelling evidence can operate “real-time” without direct input from primary cortex (V1). In our first experiment, used a reaching task demonstrate an individual with dense...
Earlier research has suggested that optic ataxia, a deficit in reaching peripheral vision, can be isolated from Balint's syndrome as it is primarily visuomotor disorder, independent of perceptual or attentional deficits. Yet almost no examined the abilities these patients. We visual attention two patients with unilateral ataxia. Results indicated both were slower to respond targets their ataxic field, irrespective cuing condition (i.e. validly, invalidly, and cue conditions), consistent an...
Recent research has demonstrated some beneficial effects in patients with neglect using rightward shifting prismatic lenses. Despite a great deal of exploring this effect, we know very little about the cognitive mechanisms underlying prism adaptation neglect. We examined possibility that influences visual attention by having healthy participants complete either reflexive or voluntary covert cuing paradigm before and after to leftward, rightward, sham (no shift) prisms. The results for...
Left neglect following right hemisphere injury is a debilitating disorder that has proven extremely difficult to rehabilitate. Traditional models of have focused on impaired spatial attention as the core deficit and such, most rehabilitation methods tried improve attentional processes. However, many these techniques (e.g., visual scanning training, caloric stimulation, neck muscle vibration) produce only short-lived effects, or are too uncomfortable use routine treatment. More recently,...
Compression induced by a pituitary tumor on the optic chiasm can generate visual field deficits, yet it is unknown how this compression affects retinotopic organization of cortex. It also not known effect cortex changes after decompression. The authors used functional MRI (fMRI) to map in 68-year-old right-handed woman before and 3 months surgery for recurrent macroadenoma. demonstrated that longitudinal perimetry, as assessed automated Humphrey test, correlated with fMRI activation manner....
Many of the positive symptoms schizophrenia, including hallucinations and passivity phenomena, have been related to dysfunction within association cortices. In addition, many cognitive deficits observed in patients with schizophrenia can also be characterised as impairments higher level cognitions known depend on these same While most attention has directed towards frontal temporal cortices, there is mounting evidence for impaired functioning parietal cortices well. That is, a substantial...