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Photograph of Preeti Verghese
Verghese Lab

Preeti Verghese

Senior Scientist
Degrees: Ph.D.

The research in my lab examines the neural processes, strategies and adaptations that humans use to interact with objects in the real world. We investigate these questions using psychophysics, eye movements, computational modeling and neuroimaging. Our goal is to understand the mechanisms of normal vision and action, as well as the basis of attention and visual adaptation in clinical populations. This work includes attention deficits in amblyopia, and the potential for binocular vision in individuals with age-related macular degeneration.

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Journal Articles
Vullings, C. (2022). Saccades during visual search in macular degeneration. Vision Research, 201. http://doi.org/10.1016/j.visres.2022.108113
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Saccadic contributions to smooth pursuit in macular degeneration. (2022). Saccadic contributions to smooth pursuit in macular degeneration. Vision Research, 200, 108102. http://doi.org/10.1016/j.visres.2022.108102
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Excitatory Contribution to Binocular Interactions in Human Visual Cortex is Reduced in Strabismic Amblyopia. (2021). Excitatory Contribution to Binocular Interactions in Human Visual Cortex is Reduced in Strabismic Amblyopia. Journal Of Neuroscience. http://doi.org/10.1523/JNEUROSCI.0268-21.2021
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Mapping the binocular scotoma in macular degeneration. (2021). Mapping the binocular scotoma in macular degeneration. Journal Of Vision, 21(3), 1-12. http://doi.org/https://doi.org/10.1167/jov.21.3.9
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Eye Movements in Macular Degeneration. (2021). Eye Movements in Macular Degeneration. Annual Reviews Of Vision Science, 7. http://doi.org/doi.org/10.1146/annurev-vision-100119-125555
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Predicting stereopsis in macular degeneration. (2020). Predicting stereopsis in macular degeneration. Journal Of Neuroscience. http://doi.org/10.1523/JNEUROSCI.0491-20.2020
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Contrast Normalization Accounts for Binocular Interactions in Human Striate and Extra-striate Visual Cortex. (2020). Contrast Normalization Accounts for Binocular Interactions in Human Striate and Extra-striate Visual Cortex. Journal Of Neuroscience, 40(13), 2753-2763.
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Motion perception in central field loss. (2019). Motion perception in central field loss. Journal Of Vision, 19, 20–20. http://doi.org/10.1167/19.14.20
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The upper disparity limit increases gradually with eccentricity. (2019). The upper disparity limit increases gradually with eccentricity. Journal Of Vision, 19(11).
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The spatial and temporal properties of attentional selectivity for saccades and reaches. (2019). The spatial and temporal properties of attentional selectivity for saccades and reaches. Journal Of Vision, 19(9):12.
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Attention Deficits in Amblyopia. (2019). Attention Deficits in Amblyopia. Current Opinion In Psychology, 29.
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Latent Binocular Interactions in Cortical Area V1 of Human Amblyopia. (2017). Latent Binocular Interactions in Cortical Area V1 of Human Amblyopia. Journal Of Vision, 17(10), 758-758. http://doi.org/10.1167/17.10.758
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Cortical sources of vernier acuity in the human visual system: an EEG source-imaging study. (2017). Cortical sources of vernier acuity in the human visual system: an EEG source-imaging study. Journal Of Vision, 17(6).
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Attention to Multiple Objects Facilitates Their Integration in Prefrontal and Parietal Cortex. (2017). Attention to Multiple Objects Facilitates Their Integration in Prefrontal and Parietal Cortex. Journal Of Neuroscience, 37(19). http://doi.org/10.1523/JNEUROSCI.2370-16.2017
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Monocular and Binocular Smooth Pursuit in Central Field Loss. (2017). Monocular and Binocular Smooth Pursuit in Central Field Loss. Vision Research.
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Texture segmentation influences the spatial profile of presaccadic attention. (2017). Texture segmentation influences the spatial profile of presaccadic attention. Journal Of Vision, 17(2).
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Accuracy of Eye Position for Saccades and Smooth Pursuit. (2016). Accuracy of Eye Position for Saccades and Smooth Pursuit. Journal Of Vision, 16(23). http://doi.org/10.1167/16.15.23
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Training Eye Movements for Visual Search in Macular Degeneration. (2016). Training Eye Movements for Visual Search in Macular Degeneration. Journal Of Vision, 16(15).
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Smooth pursuit eye movements in patients with macular degeneration. (2016). Smooth pursuit eye movements in patients with macular degeneration. Journal Of Vision, 16, 1.
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Degraded attentional modulation of cortical neural populations in strabismic amblyopia. (2016). Degraded attentional modulation of cortical neural populations in strabismic amblyopia. Journal Of Vision, 16, 16.
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Degraded attentional modulation of cortical neural populations in strabismic amblyopia. (2016). Degraded attentional modulation of cortical neural populations in strabismic amblyopia. Journal Of Vision, 16(3), 1–16.
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Depth Perception and Grasp in Central Field Loss. (2016). Depth Perception and Grasp in Central Field Loss. Investigative Ophthalmology & Visual Science, 57, 1476-87.
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Cortical sources of vernier acuity: an EEG-source imaging study. (2015). Cortical sources of vernier acuity: an EEG-source imaging study. Journal Of Vision, 15, 1004.
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Efficient saccade planning requires time and clear choices. (2015). Efficient saccade planning requires time and clear choices. Vision Research, 113, 125-36.
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Stop before you saccade: Looking into an artificial peripheral scotoma. (2015). Stop before you saccade: Looking into an artificial peripheral scotoma. Journal Of Vision, 15, 7.
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The influence of segmentation and uncertainty on target selection. (2014). The influence of segmentation and uncertainty on target selection. Journal Of Vision, 14, 3.
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Attentional modulation: target selection, active search and cognitive processing. (2013). Attentional modulation: target selection, active search and cognitive processing. Vision Research, 85, 1-4.
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Active search for multiple targets is inefficient. (2012). Active search for multiple targets is inefficient. Vision Research, 74, 61-71.
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Attention selects informative neural populations in human V1. (2012). Attention selects informative neural populations in human V1. The Journal Of Neuroscience : The Official Journal Of The Society For Neuroscience, 32, 16379-90.
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The selectivity of task-dependent attention varies with surrounding context. (2012). The selectivity of task-dependent attention varies with surrounding context. The Journal Of Neuroscience : The Official Journal Of The Society For Neuroscience, 32, 12180-91.
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Vision Research special issue on "Visual attention". (2012). Vision Research special issue on "Visual attention". Vision Research, 74, 1.
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Contours in noise: a role for self-cuing?. (2009). Contours in noise: a role for self-cuing?. Journal Of Vision, 9, 2 1-16.
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Peeling plaids apart: context counteracts cross-orientation contrast masking. (2009). Peeling plaids apart: context counteracts cross-orientation contrast masking. Plos One, 4, e8123.
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Pooling and segmenting motion signals. (2009). Pooling and segmenting motion signals. Vision Research, 49, 1065-72.
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Visual attention: Neurophysiology, psychophysics and cognitive neuroscience. (2009). Visual attention: Neurophysiology, psychophysics and cognitive neuroscience. Vision Research, 49, 1033-6.
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Effect of central scotoma on eye movement behavior. (2008). Effect of central scotoma on eye movement behavior. Journal Of Vision, 8, 641–641.
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Efficienct Eye Movements for Low Vision Rehabilitation. (2007). Efficienct Eye Movements for Low Vision Rehabilitation. Journal Of Vision, 7, 98–98.
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Orientation discrimination in the periphery depends on the context. (2007). Orientation discrimination in the periphery depends on the context. Journal Of Vision, 7, 585–585.
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The wallpaper illusion explained. (2007). The wallpaper illusion explained. Journal Of Vision, 7, 10 1-11.
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Where to look next? Eye movements reduce local uncertainty. (2007). Where to look next? Eye movements reduce local uncertainty. Journal Of Vision, 7, 6.
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Evolution of a motion trajectory over time. (2007). Evolution of a motion trajectory over time. Journal Of Vision, 7, 1013–1013.
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Collinear facilitation is largely uncertainty reduction. (2006). Collinear facilitation is largely uncertainty reduction. Journal Of Vision, 6, 170-8.
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Motion grouping impairs speed discrimination. (2006). Motion grouping impairs speed discrimination. Vision Research, 46, 1540-6.
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Eye movements incorporate knowledge of part structure. (2006). Eye movements incorporate knowledge of part structure. Journal Of Vision, 6, 482–482.
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Motion grouping impairs speed discrimination. (2006). Motion grouping impairs speed discrimination. Vision Research, 46, 1540-6.
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An information maximization model of eye movements. (2005). An information maximization model of eye movements. Advances In Neural Information Processing Systems, 17, 1121-8.
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Attention to locations and features: different top-down modulation of detector weights. (2005). Attention to locations and features: different top-down modulation of detector weights. Journal Of Vision, 5, 556-70.
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Predictability and the dynamics of position processing in the flash-lag effect. (2005). Predictability and the dynamics of position processing in the flash-lag effect. Perception, 34, 31-44.
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Stereo sensitivity depends on stereo matching. (2005). Stereo sensitivity depends on stereo matching. Journal Of Vision, 5, 783-92.
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Modeling eye movements in a shape discrimination task. (2005). Modeling eye movements in a shape discrimination task. Journal Of Vision, 5, 921–921.
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Visual attention. (2004). Visual attention. Vision Research, 44, 1189-91.
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Visual search in clutter. (2004). Visual search in clutter. Vision Research, 44, 1217-25.
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What is the depth of a sinusoidal grating?. (2004). What is the depth of a sinusoidal grating?. Journal Of Vision, 4, 524-38.
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Comparing integration rules in visual search. (2002). Comparing integration rules in visual search. Journal Of Vision, 2, 559-70.
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Contour completion through depth interferes with stereoacuity. (2002). Contour completion through depth interferes with stereoacuity. Vision Research, 42, 2153-162.
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Integration of speed signals in the direction of motion. (2002). Integration of speed signals in the direction of motion. Perception & Psychophysics, 64, 996-1007.
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Predicting future motion. (2002). Predicting future motion. Journal Of Vision, 2, 413-23.
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Stereo transparency and the disparity gradient limit. (2002). Stereo transparency and the disparity gradient limit. Vision Research, 42, 1963-77.
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The unique criterion constraint: a false alarm?. (2002). The unique criterion constraint: a false alarm?. Nature Neuroscience, 5, 707; author reply 707-8.
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Visual search and attention: a signal detection theory approach. (2001). Visual search and attention: a signal detection theory approach. Neuron, 31, 523-35.
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Stimulus configuration determines the detectability of motion signals in noise. (2000). Stimulus configuration determines the detectability of motion signals in noise. Journal Of The Optical Society Of America. A, Optics, Image Science, And Vision, 17, 1525-34.
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The psychophysics of visual search. (2000). The psychophysics of visual search. Vision Research, 40, 1227-68.
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Local motion detectors cannot account for the detectability of an extended trajectory in noise. (1999). Local motion detectors cannot account for the detectability of an extended trajectory in noise. Vision Research, 39, 19-30.
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Spatial layout affects speed discrimination. (1997). Spatial layout affects speed discrimination. Vision Research, 37, 397-406.
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Perceived visual speed constrained by image segmentation. (1996). Perceived visual speed constrained by image segmentation. Nature, 381, 161-3.
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Combining speed information across space. (1995). Combining speed information across space. Vision Research, 35, 2811-23.
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Stimulus discriminability in visual search. (1994). Stimulus discriminability in visual search. Vision Research, 34, 2453-67.
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The scale bandwidth of visual search. (1994). The scale bandwidth of visual search. Vision Research, 34, 955-62.
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The information capacity of visual attention. (1992). The information capacity of visual attention. Vision Research, 32, 983-95.
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Ghahghaei, S. Predicting Stereopsis in Macular Degeneration. Journal Of Neuroscience.
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Presentations/Posters
Saccades during smooth pursuit in macular degeneration. (2021). Saccades during smooth pursuit in macular degeneration. Investigative Ophthalmology & Visual Science.
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Do saccade characteristics in macular degeneration adapt to compensate for the binocular scotoma?. (2020). Do saccade characteristics in macular degeneration adapt to compensate for the binocular scotoma?. Date Published 09/2020, Bay Area Vision Research Day: Online.
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Effects of task demands on smooth pursuit gain in macular degeneration. (2020). Effects of task demands on smooth pursuit gain in macular degeneration. Investigative Ophthalmology & Visual Science. Association for Research in Vision and Ophthalmology Annual Meeting: Canceled due to COVID.
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Mapping the binocular scotoma in macular degeneration. (2019). Mapping the binocular scotoma in macular degeneration. Bay Area Vision Research Day.
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Binocular scotoma mapping and eye movement patterns in central field loss. (2019). Binocular scotoma mapping and eye movement patterns in central field loss. Gordon Research Conference on Eye Movements. Lewiston, USA: Lewiston, USA.
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Motion Perception in Central Field Loss: Visual Field Contributions. (2019). Motion Perception in Central Field Loss: Visual Field Contributions. Investigative Ophthalmology & Visual Science. ARVO: Vancouver B.C.
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Does eccentric fixation alter head movement strategy for smooth pursuit?. (2019). Does eccentric fixation alter head movement strategy for smooth pursuit?. Neural Control of Movement: Toyama, Japan.
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Interaction of Eye and Head Movements during Smooth Pursuit in Macular Degeneration. (2018). Interaction of Eye and Head Movements during Smooth Pursuit in Macular Degeneration. Investigative Ophthalmology & Visual Science.
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Motion Perception in Central Field Loss. (2018). Motion Perception in Central Field Loss.
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Stereo perimetry reveals a foveal impairment of stereopsis in amblyopia. (2018). Stereo perimetry reveals a foveal impairment of stereopsis in amblyopia.
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Gaze Changes from Binocular to Monocular Viewing during Smooth Pursuit in Macular Degeneration. (2016). Gaze Changes from Binocular to Monocular Viewing during Smooth Pursuit in Macular Degeneration. Investigative Ophthalmology & Visual Science.
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Assessing Patients with Central Field Loss Using a Low-Cost Virtual Reality System with Head Tracking. (2016). Assessing Patients with Central Field Loss Using a Low-Cost Virtual Reality System with Head Tracking.
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Do we foveate targets during smooth pursuit?. (2016). Do we foveate targets during smooth pursuit?.
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Relative Eye Position During Monocular and Binocular Pursuit in Central Field Loss. (2016). Relative Eye Position During Monocular and Binocular Pursuit in Central Field Loss.
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Evaluation of Smooth Pursuit in Individuals with Central Field Loss. (2015). Evaluation of Smooth Pursuit in Individuals with Central Field Loss. European Conference on Eye Movements. Vienna, Austria: Vienna, Austria.
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Feedback about gaze position improves saccade efficiency. (2015). Feedback about gaze position improves saccade efficiency. Journal of vision.
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Characteristics of Monocular Smooth Pursuit in Central Field Loss. (2015). Characteristics of Monocular Smooth Pursuit in Central Field Loss.
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Immediate feedback improves saccadic efficiency. (2013). Immediate feedback improves saccadic efficiency. Journal of Vision. Association for Research in Vision and Ophthalmology.
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Other Publications
Maloney, L. T. (2015). The Efficiency of Vision and Action. http://doi.org/10.1016/j.visres.2015.06.003
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Rehabilitation Engineering Research Center

The Center's research goal is to develop and apply new scientific knowledge and practical, cost-effective devices to better understand and address the real-world problems of blind, visually impaired, and deaf-blind consumers

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Active
Active

Stereopsis in Macular Degeneration

Macular degeneration affects the central retina, often causing asymmetrical damage to the two eyes. How does this asymmetrical loss affect stereopsis — the percept of depth generated by the small separation of image features in the two eyes?

Active

Tracking a target in depth with central field loss

Bilateral field loss due to maculopathy creates a scotoma that extends in depth — a volume scotoma. Morevoer the size of the scotoma depends on whether observers turn their eyes to track a target as it comes closer. This project investigates how the volume scotoma affects the ability to track oncoming targets in these individuals, and in controls with a simulated volume scotoma.

Active

Postdoctoral Training in Vision Research

The Smith-Kettlewell Eye Research Institute (SKERI) is an NEI Institutional Training Grant Awardee. The grant was awarded to provide postdoctoral training in basic and clinical science relevant to translational vision research and rehabilitation.

Active

Adaptive Visual Strategies for Individuals with Macular Degeneration

In this project we try to gain a better understanding of what visual strategies people use to gather information in the world.

Active

Fovea Use During Smooth Pursuit

There is continuing debate as to whether smooth pursuit relies on the foveation of a moving target, especially when the target is compact. Previous studies have shown that gaze is placed on the center-of-mass of a target during saccadic eye movements. This research aims to understand whether eye...

Active

Characteristics of Smooth Pursuit in Individuals with Central Field Loss

This project investigates the properties of smooth pursuit eye movements in individuals with macular degeneration. Commonly believed to be a fovea-linked eye movement, smooth pursuit has not been previously investigated in individuals with central field loss, despite its importance for tracking moving objects, such as vehicles or pedestrians on a busy street.

Active

Eye-Hand coordination in Central Field Loss

Eye-hand coordination in AMD

Active

Modeling Smooth Pursuit Eye-Movement Deficits in Macular Degeneration

The project investigates the deficits in smooth pursuit in individuals with age-related macular degeneration within the framework of a Bayesian model.

Active

Coordination of Eye and Head Movements in Central Field Loss

This project investigates the interaction between central field loss (CFL) and vestibular function.

Completed
Completed

Upper Depth Limit Across Visual Field

Stereopsis is important for tasks of daily living such as eye-hand coordination. It is best in central vision but is also mediated by the periphery. Previously we have shown that individuals with central-field loss who have residual stereopsis in the periphery perform better at an eye-hand-coordination task. Here we sought to determine what sets the limit of stereopsis, defined as the largest disparity that supports the sustained appearance of depth, in the near periphery in healthy individuals.

Completed

Motion Perception in Central Field Loss

The project investigates motion perception in individuals with vision loss due to central retinal lesion, but who retain healthy peripheral retina. Healthy peripheral retina is exquisitely sensitive to fast speeds, however, there is limited and conflicting information about motion processing in residual peripheral retina in patients with central field loss, often due to macular degeneration. We use psychophysical and eye tracking approaches to systematically probe speed and direction sensitivity in this  population. 

Completed

Novel Method to Teach Scotoma Awareness

This project aims to improve visual function in individuals with age-related macular degeneration (AMD). AMD isassociated with central field loss that cannot be corrected optically. Individuals with AMD are often unaware of their scotoma and their eye movements follow more random patterns,...

Completed

Strategies for Efficient Visual Information Gathering

Active visual search

Completed

Target Selection in the Real World

Attention and Segmentation

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Email: preeti@ski.org
Email: preeti@ski.org
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