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Brain and Vision Research Laboratory
& NeuroVisual Clinic Biomedical Engineering Department, Boston University |
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| The Brain and Vision Research Laboratory hosts a research seminar series. Anyone with an interest in the neuroscience of vision is encouraged to attend. Please check here regularly for upcoming talks. In addition to the public seminar series, the laboratory also holds weekly seminars to discuss current and ongoing research efforts in the lab. |
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The neural basis of priming of motion direction and spatial position Gianluca Campana, Ph.D. University of Padova Repeated presentation of the same or similar visual stimuli can improve the speed of detection or discrimination of such stimuli. This phenomenon, called visual priming, is due to an implicit short-term memory mechanism that can operate at the level of object features and by means of the activity of functionally specialised low-level visual areas. Despite a number of studies attempted to uncover the neural basis of visual priming, only recent transcranial magnetic stimulation (TMS) experiments could establish a causal role of specific extrastriate cortical areas in the generation of priming. A new TMS paradigm was implemented for interfering with the functional integrity of circumscribed portions of cerebral cortex during the inter-stimulus interval; that is, when the subject was basically idle. The rationale was that, if a specific targeted area is responsible for holding in memory the priming information from one trial to the next one, such information could be cancelled by TMS delivered during the inter-stimulus interval and therefore priming would not take place. In this way it was possible to show that area V5/MT, known to be involved in motion perception, is also crucial for the generation of priming of motion direction (Campana et al., 2002, 2006). On the other hand, it has been shown that left frontal eye field (lFEF), known to be involved in spatial cognition and saccade preparation, is also responsible for priming of spatial position (Campana et al., 2007). These findings, together with psychophysical, human neuroimaging and neuropsychological studies, converge in suggesting that priming results from a low-level perceptual representation of the memory trace of simple stimulus attributes. Indeed, as postulated by the Perceptual Representation System hypothesis (PRS: Tulving & Schacter, 1990), we maintain that the same visual areas involved in the representation of simple stimulus attributes such as colour, orientation, motion direction or spatial position, are also responsible for the implicit short-term memory expressed by visual priming.
Monday - May 19th, 2008 - 4:00pm |
Past Seminars:
| When & Where | Speaker | Title |
|---|---|---|
| Tue., Apr. 22, 2008 5pm 44 Cummington St. Rm. 705 |
Dr. Lars Michels Funktionelle Neurochirurgie, UniversitatsSpital Zurich, Switzerland |
"EEG alpha distinguishes between cuneal and precuneal activation in working memory" |
| Wed., Mar.19, 2008 4pm 44 Cummington St. Rm. 401 |
Dr. Peter Bex Schepens Eye Research Institute |
"What Information Do We Use To Detect and Identify Natural Images?" |
| Tue., Oct. 30, 2007 4pm 44 Cummington St. Rm. 401 |
Dr. Rick O. Gilmore Pennsylvania State University |
"Development of Cortical Responses to Optic Flow" |
| Mon., Oct. 29, 2007 4pm 44 Cummington St. Rm. 401 |
Dr. Simon Rushton Cardiff University |
"Perception of Object Movement During Self-Movement" |
| Mon., Oct. 22, 2007 4pm 44 Cummington St. Rm. 401 |
Dr. Laurenz Wiskott Bernstein Center of Computational Neuroscience Berlin & Institute for Theoretical Biology, Humboldt-University Berlin |
"Is slowness a learning principle for complex cells in V1 and visual invariances in IT?" |
| Fri., Jun. 8, 2007 3pm 44 Cummington St. Rm. 401 |
Dr. Heiko Hecht Johannes Gutenberg-Universitat Mainz |
"Time to Collision" |
| Mon., Jul. 24, 2006 10am 44 Cummington St. Rm. 401 |
Dr. Scott A. Bearsley Brain & Vision Research Laboratory |
"Optic Flow"-round table with Prof. Lucia M. Vaina, Finn Calabro, Elif Sikoglu, Dr.Robert Pitts |
| Fri., May 19, 2006 10am 44 Cummington St. Rm. 401 |
Jutta Billino Justus Liebig University Giessen |
"Motion perception under constraints" |
| Wed., Nov. 16, 2005 | Dr. Scott A. Beardsley Brain & Vision Research Laboratory |
Round table-present and future research |
| Tue., Oct. 11 & 18, 2005 4-5pm 44 Cummington St. Rm. 203 |
Dr. Heiko Hecht Johannes Gutenberg-Universit |
"Time to collision" and "Time to passage" |
| Fri., June 4, 2004 1:00pm 44 Cummington St. Rm. 203 |
Dr. Dae-Shik Kim Associate Professor of Anatomy and Neurobiology, Director of the Center for Biomedical Imaging, Boston University School of Medicine |
"High-resolution functional and diffusion tensor imaging of the mammalian visual system" |
| Fri., May 28, 2004 12:00pm 44 Cummington St. Rm. 203 |
Dr. Kestutis Kveraga Department of Brain and Cognitive Science, Darmouth College |
"Sensorimotor Decisions, Eye Movements, And Uncertainty" |
| Fri., May 14, 2004 3:00pm 44 Cummington St. Rm. 203 |
Dr. Frederick A. Miles Laboratory of Sensorimotor Research, The National Eye Institute |
"Vision and Eye Movements in a 3–D World" |
| Thu., Apr. 8, 2004 5:00-7:00pm 44 Cummington St. Rm. 203 |
Prof. Emilio Bizzi, M.D. Massachusetts Institute of Technology |
"Motor Learning and Motor Control" |
| Thu., Mar. 25, 2004 5:00-7:00pm 44 Cummington St. Rm. 203 |
Dr. Martin Giese Laboratory for Action Representation and Learning, Dept. of Cognitive Neurology, University Clinic TŸbingen and Brain and Vision Research Laboratory, Biomedical Engineering Department, Boston University |
"Modeling Learning Based Recognition of Biological Motion" |
| Thu., Feb. 26, 2004 5:00-7:00pm 44 Cummington St. Rm. 203 |
Prof. Alan Cowey, F.R.S. Oxford University |
"Plasticity in Blindsight" |
| Thu., Sep. 18, 2003 12:30-1:30pm 44 Cummington St. Rm. 203 |
Dr. Dan Pollen Professor of Neurology, Department of Neurology, University of Massachusetts Medical Center |
"Does conscious visual perception emerge globally within transcortical multi-level recursive neural networks or do such networks endow selective cortical areas with properties that locally engender particular conscious experiences?" |
| Tue., May 13, 2003 12:00-1:00pm 44 Cummington St. Rm. 203 |
Serge O. Dumoulin McGill Vision Research Unit, Department of Ophthalmology, McGill University, Montréal, Canada |
"Cortical specialization for processing first- and second-order motion" |
| Fri., Apr. 11, 2003 10:00-11:00am 44 Cummington St. Rm. 401 |
Marc Pomplun, Ph.D. Harvard Medical School |
"Attending to Motion: A Neural Model for Localizing and Labeling Simple Motion Patterns in Image Sequences" |
| Wed-Fri., Feb. 12-14, 2003 10:00-12:00pm 44 Cummington St. Rm. 401 |
Christopher Tyler, Ph.D. Associate Director, Smith Kettlewell Institute, San Francisco |
A series of 4 lectures on: "Ideal Observer", "Summation Principles", "An Overview of Human Depth Processing" and "Symmetry" |
| Fri., Jan. 31, 2003 10:00-11:00am 44 Cummington St. Rm. 401 |
Simon Rushton, Ph.D. Centre for Vision Research, York University |
"Intercepting Projectiles: From 'When & Where' to 'Where Once'" |
| Fri., Dec. 13, 2002 11:00-12:00pm 44 Cummington St. Rm. 401 |
Richard Born, M.D. Harvard Medical School |
"Reassembling the Visual World: The Integration of Motion Cues by Cortical Neurons" |
| Fri., Nov. 15, 2002 11:00-12:00pm 44 Cummington St. Rm. 401 |
Brad Duchaine, Ph.D. Vision Sciences Laboratory, Harvard University |
"Investigations into prosopagnosia" |
| Fri., Oct. 25, 2002 11:00-12:00pm 44 Cummington St. Rm. 401 |
David Salat, Ph.D. NMR Center, Massachusetts General Hospital |
"MRI techniques to examine age and Alzheimer-related changes in the brain" |
| Tue., Jul. 16, 2002 1:00-2:00pm 44 Cummington St. Rm. 203 |
Dr. Peter Fšldi‡k Psychological Laboratory, University of St. Andrews, St. Andrews, U.K. |
"Invariance Learning" |
| Thu., Apr. 18, 2002 12:15-1:15pm 44 Cummington St. Rm. 203 |
David Ingle | "2 Visual Systems Revisited" |
| Thu., Apr. 4, 2002 12:15-1:15pm 44 Cummington St. Rm. 203 |
Jeremy Wilmer Department of Psychology, Harvard University |
"Individual Differences in Low-Level Visual Motion Processing: A Study of Dyslexic Adults and Controls Across Motion Paradigms" |
| Thu., Dec. 6, 2001 4-5pm 44 Cummington St. Rm. 401 |
Steven Stufflebeam, M.D. MGH-NMR Center, Massachusetts General Hospital, Boston, MA |
"Introduction to Designing Magnetoencephalography Experiments" |
| Wed., Aug. 8, 2001 4-5pm 44 Cummington St. Rm. 203 |
Dr. Markus Lappe Computational and Cognitive Neuroscience, Dept. Zoology & Neurobiology, Ruhr-University, Bochum, Germany |
"Perception of Travel Distance from Optic Flow" |
| Wed., Feb. 21, 2001 4-5pm 44 Cummington St. Rm. 203 |
Dr. Heiko Hecht Man-Vehicle Lab, MIT |
"Visual Judgement of Collisions and Near Collisions: The Sorry State of Tau Theory" |
| Wed., Dec. 13, 2000 3-4:30pm 44 Cummington St. Rm. 203 |
Ona Wu, M.Sc. MIT, MGH-NMR Center |
"Diffusion and perfusion-weighted magnetic resonance imaging in acute human cerebral ischemia" |
| Tue., Oct. 25, 2000 3-4pm 44 Cummington St. Rm. 401 |
Rick M. Dijkhuizen, Ph.D. MGH-NMR Center Harvard Medical School |
"Functional MRI of Reorganization in Rat Brain after Stroke" |
| Tue., Oct 17, 2000 4-5pm 44 Cummington St. Rm. 203 |
Dr. Rob Gray Nissan Cambridge Basic Research, Cambridge, MA |
"What Can Motion Aftereffects Teach us About Action and Attention?" |
| Tue., Aug. 22, 2000 11-12pm 44 Cummington St. Rm. 203 |
Dr. Alan Johnston Dept. of Psychology, University College London |
"Why a Gradient Model Can See Second-Order Motion Though an Energy Model Can't" |
| Thu., Aug. 3, 2000 11-12pm 44 Cummington St. Rm. 203 |
Dr. Annette Schmid Institute of Neurology, University College London |
"A fMRI Study of Anticipation and Learning in Smooth Pursuit Eye Movements" |
| Fri., Jul. 21, 2000 10-11am 44 Cummington St. Rm. 401 |
Neel Varshney University of Alabama, Birmingham |
"Current results for a competitive neural network model of feedforward processing from V1 to MT" |
| Wed., Apr. 26, 2000 1-2pm 44 Cummington St. Rm. 203 |
Dr. Julie Harris Department of Psychology, University of Newscastle |
"Are two eyes always better than one? Binocular information for determining object-motion and self-motion" |
| Wed., Apr. 19, 2000 1-2pm 44 Cummington St. Rm. 203 |
Dr. Nouchine Hadjikhani NMR Center, Department of Radiology, MGH |
"Colors in the Brain - Brains in Colors" |
| Wed., Apr. 5, 2000 1-2pm 44 Cummington St. Rm. 203 |
Dr. Li Li Schepens Eye Research Institute, Harvard Medical School |
"Heading Perception and Active Control of Steering during Translation and Rotation" |
| Mon., Mar. 27, 2000 1-2pm 44 Cummington St. Rm. 203 |
Vlada Aginsky Department of Cognitive and Linguistic Science, Brown University |
"Navigating with and without Landmarks in Virtual Reality" |
| Mon., Feb. 28, 2000 1-2pm 44 Cummington St. Rm. 203 |
Martin A. Giese CBCL, MIT |
"Representation of biological motion based on learned prototypical example patterns" |
| Mon., Jan. 31, 2000 1-2pm 44 Cummington St. Rm. 401 |
Dr. Ian M. Thornton Nissan Cambridge Basic Research, Cambridge, MA |
"Attending to Biological Motion" |
| Mon., Jan. 24, 2000 1-2pm 44 Cummington St. Rm. 203 |
Dr. Moshe Bar Massachusetts General Hospital |
"Mechanisms of object recognition revealed by subliminal visual priming" |
| Fri., Jan. 21, 2000 3-4pm 44 Cummington St. Rm. 203 |
Orna Rosenthal Hebrew University, Jerusalem, Israel |
"Unsupervised Perceptual Learning" |
| Fri., Jan. 14, 2000 2-3pm 44 Cummington St. Rm. 203 |
Dr. Peter Földiák Center for Neuroscience, New York University |
"Processing of rapid image sequences in the visual cortex" |
| Mon., Dec. 6, 1999 1-2pm 44 Cummington St. Rm. 401 |
Dr. Martin Giese Center for Biological and Computational Learning, MIT |
TBA |
| Mon., Nov. 22, 1999 1-2pm 44 Cummington St. Rm. 203 |
Simon Rushton Nissan Cambridge Basic Research, Cambridge, MA |
"An Eccentric Egocentric Model of Control of Locomotion on Foot" |
| Mon., Nov. 15, 1999 1-2pm 44 Cummington St. Rm. 203 |
Professor Alan Cowey Oxford University |
"Is Blindsight Motion Blind?" |
| Mon., Oct. 18, 1999 1-2pm 44 Cummington St. Rm. 401 |
Maximilian Riesenhuber Dept. of Brain and Cognitive Science, MIT |
"A New Hierarchical Model of Object Recognition in Cortex" |
| Thu., Apr. 22, 1999 4pm Photonics Rm. 210 |
Dr. Leslie Welch Brown University |
"Evidence for category learning in the visual system" |
| Tue., Apr. 20, 1999 4pm 44 Cummington St. Rm. 401 |
Dr. David Somers MIT |
"fMRI studies of visual attention and motion perception" |
| Thu., Apr. 8, 1999 4pm Photonics Rm. 210 |
Dr. William Warren Brown University |
"Perception of heading from optic flow, cont." |
| Mon., Apr. 5, 1999 5:30pm 44 Cummington St. Rm. 401 |
Dr. Maarten J. van der Smagt Universiteit Utrecht |
"The transparent motion aftereffect: what does it tell us about motion processing" |
| Thu., Feb. 25, 1999 5:30pm Photonics Rm. 210 |
Dr. Ehud Kaplan | "Color, size, and all the rest: how do they all fit together in the cortex" |
| Tue., Feb. 23, 1999 4pm Photonics Rm. 210 |
Dr. Barry Horowitz National Institute on Aging |
"Functional neuroimaging data and neural modeling: delineating brain visual processing networks" |
| Thu., Feb. 11, 1999 4pm Photonics Rm. 210 |
Dr. Margaret Livingstone Harvard Medical School |
"2-bar interactions in space and time: stereopsis and directionality" |
| Wed., Sep. 30, 1998 2:30pm 44 Cummington St. Rm. 401 |
Dr. John Assad Harvard University |
"Representing direction in parietal cortex during visual guidance" |
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