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.

See Publications

verghese_cv2017.pdf

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Journal Articles

Hou, C., Tyson, T. L., Üner, I., & Verghese, P.. (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 (Original work published 2017)

Hou, C., Kim, Y. J., & Verghese, P.. (2017). Cortical sources of vernier acuity in the human visual system: an EEG source-imaging study. Journal Of Vision, 17(6). (Original work published 2017)

Kim, Y. J., Tsai, J. J., Ojemann, J., & Verghese, P.. (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 (Original work published 2017)

Ghahghaei, S., & Verghese, P.. (2017). Texture segmentation influences the spatial profile of presaccadic attention. Journal Of Vision, 17(2).

Shanidze, N., Heinen, S. J., & Verghese, P.. (2017). Monocular and Binocular Smooth Pursuit in Central Field Loss. Vision Research.

Janssen, C. P., & Verghese, P.. (2016). Training Eye Movements for Visual Search in Macular Degeneration. Journal Of Vision, 16(15). (Original work published 2016)

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Shanidze, N., Fusco, G., Potapchuk, E., Heinen, S. J., & Verghese, P.. (2016). Smooth pursuit eye movements in patients with macular degeneration. Journal Of Vision, 16, 1.

Verghese, P., Tyson, T. L., Ghahghaei, S., & Fletcher, D. C.. (2016). Depth Perception and Grasp in Central Field Loss. Investigative Ophthalmology & Visual Science, 57, 1476-87.

Shanidze, N., Ghahghaei, S., & Verghese, P.. (2016). Accuracy of Eye Position for Saccades and Smooth Pursuit. Journal Of Vision, 16(23). http://doi.org/10.1167/16.15.23

Hou, C., Kim, Y. J., Lai, X. J., & Verghese, P.. (2016). Degraded attentional modulation of cortical neural populations in strabismic amblyopia. Journal Of Vision, 16, 16.

Hou, C., Kim, Y. J., Lai, X. J., & Verghese, P.. (2016). Degraded attentional modulation of cortical neural populations in strabismic amblyopia. Journal Of Vision, 16(3), 1–16.

Janssen, C. P., & Verghese, P.. (2015). Stop before you saccade: Looking into an artificial peripheral scotoma. Journal Of Vision, 15, 7.

Ghahghaei, S., & Verghese, P.. (2015). Efficient saccade planning requires time and clear choices. Vision Research, 113, 125-36.

Hou, C., Kim, Y. J., & Verghese, P.. (2015). Cortical sources of vernier acuity: an EEG-source imaging study. Journal Of Vision, 15, 1004.

Kim, Y. J., & Verghese, P.. (2014). The influence of segmentation and uncertainty on target selection. Journal Of Vision, 14, 3.

Carrasco, M., Eckstein, M., Krauzlis, R., & Verghese, P.. (2013). Attentional modulation: target selection, active search and cognitive processing. Vision Research, 85, 1-4.

Verghese, P. (2012). Active search for multiple targets is inefficient. Vision Research, 74, 61-71.

Carrasco, M., Eckstein, M., Krauzlis, R., & Verghese, P.. (2012). Vision Research special issue on "Visual attention". Vision Research, 74, 1.

Kim, Y. J., & Verghese, P.. (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.

Verghese, P., Kim, Y. J., & Wade, A. R.. (2012). Attention selects informative neural populations in human V1. The Journal Of Neuroscience : The Official Journal Of The Society For Neuroscience, 32, 16379-90.

Burr, D., Baldassi, S., Morrone, M. C., & Verghese, P.. (2009). Pooling and segmenting motion signals. Vision Research, 49, 1065-72.

Verghese, P. (2009). Contours in noise: a role for self-cuing?. Journal Of Vision, 9, 2 1-16.

Carrasco, M., Eckstein, M., Verghese, P., Boynton, G., & Treue, S.. (2009). Visual attention: Neurophysiology, psychophysics and cognitive neuroscience. Vision Research, 49, 1033-6.

Freeman, E., & Verghese, P.. (2009). Peeling plaids apart: context counteracts cross-orientation contrast masking. Plos One, 4, e8123.

Walker, L., Dang, L., Verghese, P., & Fletcher, D. C.. (2008). Effect of central scotoma on eye movement behavior. Journal Of Vision, 8, 641–641.

Walker, L., & Verghese, P.. (2007). Orientation discrimination in the periphery depends on the context. Journal Of Vision, 7, 585–585.

Walker, L., Verghese, P., & Fletcher, D. C.. (2007). Efficienct Eye Movements for Low Vision Rehabilitation. Journal Of Vision, 7, 98–98.

Walker, L., Verghese, P., & Coughlan, J.. (2007). Where to look next? Eye movements reduce local uncertainty. Journal Of Vision, 7, 6.

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McKee, S. P., Verghese, P., Ma-Wyatt, A., & Petrov, Y.. (2007). The wallpaper illusion explained. Journal Of Vision, 7, 10 1-11.

Verghese, P., & Coughlan, J.. (2007). Evolution of a motion trajectory over time. Journal Of Vision, 7, 1013–1013.

Petrov, Y., Verghese, P., & McKee, S. P.. (2006). Collinear facilitation is largely uncertainty reduction. Journal Of Vision, 6, 170-8.

Verghese, P., & McKee, S. P.. (2006). Motion grouping impairs speed discrimination. Vision Research, 46, 1540-6.

Walker, L., Verghese, P., & Coughlan, J.. (2006). Eye movements incorporate knowledge of part structure. Journal Of Vision, 6, 482–482.

Verghese, P., & McKee, S. P.. (2006). Motion grouping impairs speed discrimination. Vision Research, 46, 1540-6.

McKee, S. P., Verghese, P., & Farell, B.. (2005). Stereo sensitivity depends on stereo matching. Journal Of Vision, 5, 783-92.

Baldassi, S., & Verghese, P.. (2005). Attention to locations and features: different top-down modulation of detector weights. Journal Of Vision, 5, 556-70.

Walker, L., Coughlan, J., Verghese, P., & Malik, J.. (2005). An information maximization model of eye movements. Advances In Neural Information Processing Systems, 17, 1121-8.

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Vreven, D., & Verghese, P.. (2005). Predictability and the dynamics of position processing in the flash-lag effect. Perception, 34, 31-44.

Walker, L., Verghese, P., & Coughlan, J.. (2005). Modeling eye movements in a shape discrimination task. Journal Of Vision, 5, 921–921.

Baldassi, S., Burr, D., Carrasco, M., Eckstein, M., & Verghese, P.. (2004). Visual attention. Vision Research, 44, 1189-91.

McKee, S. P., Verghese, P., & Farell, B.. (2004). What is the depth of a sinusoidal grating?. Journal Of Vision, 4, 524-38.

Verghese, P., & McKee, S. P.. (2004). Visual search in clutter. Vision Research, 44, 1217-25.

Baldassi, S., & Verghese, P.. (2002). Comparing integration rules in visual search. Journal Of Vision, 2, 559-70.

Verghese, P., & McKee, S. P.. (2002). Predicting future motion. Journal Of Vision, 2, 413-23.

Vreven, D., & Verghese, P.. (2002). Integration of speed signals in the direction of motion. Perception & Psychophysics, 64, 996-1007.

Kontsevich, L. L., Chen, C. C., Verghese, P., & Tyler, C. W.. (2002). The unique criterion constraint: a false alarm?. Nature Neuroscience, 5, 707; author reply 707-8.

Vreven, D., McKee, S. P., & Verghese, P.. (2002). Contour completion through depth interferes with stereoacuity. Vision Research, 42, 2153-162.

McKee, S. P., & Verghese, P.. (2002). Stereo transparency and the disparity gradient limit. Vision Research, 42, 1963-77.

Verghese, P. (2001). Visual search and attention: a signal detection theory approach. Neuron, 31, 523-35.

Palmer, J., Verghese, P., & Pavel, M.. (2000). The psychophysics of visual search. Vision Research, 40, 1227-68.

Verghese, P., McKee, S. P., & Grzywacz, N. M.. (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.

Verghese, P., Watamaniuk, S. N. J., McKee, S. P., & Grzywacz, N. M.. (1999). Local motion detectors cannot account for the detectability of an extended trajectory in noise. Vision Research, 39, 19-30.

Verghese, P., & Stone, L. S.. (1997). Spatial layout affects speed discrimination. Vision Research, 37, 397-406.

Verghese, P., & Stone, L. S.. (1996). Perceived visual speed constrained by image segmentation. Nature, 381, 161-3.

Verghese, P., & Stone, L. S.. (1995). Combining speed information across space. Vision Research, 35, 2811-23.

Verghese, P., & Nakayama, K.. (1994). Stimulus discriminability in visual search. Vision Research, 34, 2453-67.

Verghese, P., & Pelli, D. G.. (1994). The scale bandwidth of visual search. Vision Research, 34, 955-62.

Verghese, P., & Pelli, D. G.. (1992). The information capacity of visual attention. Vision Research, 32, 983-95.

Presentations/Posters

Shanidze, N., Ullman, E., Badler, J., & Verghese, P.. (2018). Interaction of Eye and Head Movements during Smooth Pursuit in Macular Degeneration.

Shanidze, N., Heinen, S. J., & Verghese, P.. (2016). Gaze Changes from Binocular to Monocular Viewing during Smooth Pursuit in Macular Degeneration. Investigative Ophthalmology & Visual Science.

Fusco, G., Shanidze, N., & Verghese, P.. (2016). Assessing Patients with Central Field Loss Using a Low-Cost Virtual Reality System with Head Tracking.

Shanidze, N., Heinen, S. J., & Verghese, P.. (2016). Relative Eye Position During Monocular and Binocular Pursuit in Central Field Loss.

Shanidze, N., Heinen, S. J., & Verghese, P.. (2016). Do we foveate targets during smooth pursuit?.

Ghahghaei, S., & Verghese, P.. (2015). Feedback about gaze position improves saccade efficiency. Journal of vision.

Shanidze, N., Potapchuk, E., Fusco, G., Heinen, S. J., & Verghese, P.. (2015). Characteristics of Monocular Smooth Pursuit in Central Field Loss.

Verghese, P., & Ghahghaei, S.. (2013). Immediate feedback improves saccadic efficiency. Journal of Vision. Association for Research in Vision and Ophthalmology.

Other Publications

Verghese, P. (2015). The Efficiency of Vision and Action. (M. S. Landy, L. T. Maloney). http://doi.org/10.1016/j.visres.2015.06.003

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Verghese Lab

Our laboratory studies the mechanisms of healthy vision and action, as well as the basis of attention and visual adaptation in clinical populations.

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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,...

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Adaptive Visual Strategies for Information Maximization in 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.

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Eye-Hand coordination in Central Field Loss

Eye-hand coordination in AMD

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Strategies for Efficient Visual Information Gathering

Active visual search

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Target Selection in the Real World

Attention and Segmentation

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Coordination of Eye and Head Movements in Central Field Loss

This project investigates the interaction between central field loss (CFL) and vestibular function. Two-thirds of patients with CFL complain of vestibular problems, such as dizziness and instability, leading to a high incidence of potentially fatal accidents and...

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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...

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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...

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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...

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Contact Information

2318 Fillmore Street

San Francisco, CA 94115

Email: preeti@ski.org

Office Phone: (415) 345-2072

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