A5038161661- Visual perception and processing mechanisms
- Ophthalmology and Visual Impairment Studies
- Glaucoma and retinal disorders
- Tactile and Sensory Interactions
- Spatial Neglect and Hemispheric Dysfunction
- Neural dynamics and brain function
- Reading and Literacy Development
- Motor Control and Adaptation
- Neurobiology and Insect Physiology Research
- Cognitive and developmental aspects of mathematical skills
- Advanced MRI Techniques and Applications
- Functional Brain Connectivity Studies
- Advanced Neuroimaging Techniques and Applications
- Spatial Cognition and Navigation
- Neurobiology of Language and Bilingualism
- Retinal Development and Disorders
- Vestibular and auditory disorders
- Advanced Vision and Imaging
- Metabolism and Genetic Disorders
- Neural and Behavioral Psychology Studies
- Advanced Optical Imaging Technologies
- Neuroscience and Music Perception
- Multisensory perception and integration
- Retinal Diseases and Treatments
- EEG and Brain-Computer Interfaces
University of British Columbia
2016-2025
British Columbia Children's Hospital
1998-2024
Child and Family Research Institute
2014
Michael Smith Health Research BC
2009
Natural Sciences and Engineering Research Council
1992-2009
Society for Neuroscience
2009
Children's & Women's Health Centre of British Columbia
2005-2007
The University of Western Australia
2006
University of California, San Diego
2006
Toronto General Hospital
1992-1997
The following psychophysical data were obtained from 13 patients with unilateral cerebral hemispheric lesions and 20 control subjects: speed thresholds for detecting recognizing motion-defined letters, coherent motion discriminating its direction, visual acuity letters of 96% 11% contrast. Acuity was between 6/6 6/3 all patients. Four showed a selective loss ability to recognize while the detect those same spared, as discriminate direction (type I loss). Three both spared II All seven who...
Abstract Individuals vary widely in their ability to orient within the environment. We used diffusion tensor imaging investigate whether this ability, as measured by navigational performance a virtual environment, correlates with anatomic structural properties of hippocampus, i.e., fractional anisotropy. found that individuals high anisotropy right hippocampus are (a) faster forming cognitive map and (b) more efficient using for purpose orientation, than low These results consistent role...
People with amblyopia show deficits in global motion perception, especially at slow speeds. These observers are also known to have unstable fixation when viewing stationary targets, relative healthy controls. It is possible that poor stability during interferes the fidelity of input motion-sensitive neurons visual cortex. To probe these mechanisms a behavioral level, we assessed coherence thresholds adults while measuring stability. Consistent prior work, participants had elevated for speed...
1. Responses of single cortical neurons in area 17 anesthetized cats were recorded response to prolonged stimulation with a patch drifting square-wave grating. 2. During adaptation the preferred direction, all showed some reduction motion stimulated direction and most opposite, nonstimulated direction. 3. For complex cells, time course decrement both directions was exponential, an average constant 5 s. Response recovery also exponential but significantly slower, constants 8 13 s directions,...
Abstract Children with dyslexia and children progressing normally in reading performed several perceptual tasks to determine (a) the psychophysical measures that best differentiate from average abilities; (b) extent of temporal processing deficits a single, well-defined group dyslexia; (c) co-occurrence visual auditory dyslexia. 4 our 12 indicated differences ability between good skills. These included 2 (dichotic pitch perception FM tone discrimination) (global motion contrast sensitivity)....
Stereoscopic depth perception may be obtained from small retinal disparities that can fused for single vision (fine stereopsis), but reliable information is also larger produce double (coarse stereopsis). Here we assess the possibility early development of coarse stereopsis makes it resilient to factors cause amblyopia by comparing performance in children with a history strabismic, anisometropic, or aniso-strabismic and age-matched controls (5-12 years). The task was indicate whether cartoon...
TWO patterns of appropriately filtered acoustic white noise can be binaurally fused by the human auditory system to extract pitch and location information that is not available either ear alone. This phenomenon called dichotic pitch. Here we present a new method for generating more effective useful stimuli. These novel stimuli allow psychophysical assessment detection thresholds. We show significantly impaired in individuals with developmental dyslexia, as compared average readers. results...