Presentation is loading. Please wait.

Presentation is loading. Please wait.

Sloan-Swartz Summer Meeting 2007

Published byBjarne Jakobsen Modified over 5 years ago

Similar presentations

Presentation on theme: "Sloan-Swartz Summer Meeting 2007"— Presentation transcript:

1 Sloan-Swartz Summer Meeting 2007
Attentional modulation of feature selectivity in area V4 James Mazer Department of Neurobiology Yale School of Medicine Sloan-Swartz Summer Meeting 2007

2 What is feature attention?
Feature-based attention: attention directed towards a particular value along some stimulus dimension in contrast to... attention to a particular region of space (space-based) attention to a particular visual “channel” or feature dimension

3 Why study feature attention?
natural visual environments are cluttered during natural vision we often know what we want, even when we don’t know where it is feature attention, like spatial attention, can provide some resolution of limited neural bandwidth or capacity problems

4 How do we study feature attention?
Where’s Waldo? Visual Search

5

6 Extrastriate area V4 IT V4 V1 V2

7 Salience maps & visual search
IT/PFC V4 LGN V1 V2

8 Salience maps & visual search
IT/PFC V4 oculomotor LGN V1 V2

9 Feeviewing visual search task
non-match (2-5s) hold bar sample (2-4s) grab bar delay (2-4s) hold bar match (2-5s) release bar

10 Feeviewing visual search task

11 Freeviewing visual search behavior

12 Modeling attentional effects
response baseline gain tuning shift passive response stimulus dimension

13 Freeviewing reverse correlation
single fixation eye position eye velocity spikes  time 

14 Freeviewing reverse correlation
stimulus waveform + spikes …

15 Modeling attentional effects
response baseline gain tuning shift passive response stimulus dimension

16 Freeviewing: summary of modulatory effects
no modulation 15% D baseline 30% D gain 49% D shape 30% n=105

17 Freevewing: summary of modulatory effects
pure Dshape 2% 5% 6% no modulation 15% 17% 30% 9% 17% pure Dgain pure Dbaseline n=105

18 Freeviewing reverse correlation
tuning spatial frequency domain m0067 STRF proj’d into stim PCA space

19 Tuning shift: matched filter
search target tuning A spatial domain spatial frequency domain spatial frequency domain m0067 STRF proj’d into stim PCA space

20 Tuning shift: matched filter
search target tuning A B C D spatial domain spatial frequency domain spatial frequency domain m0067 STRF proj’d into stim PCA space

21 Tuning shift: unknown relationship to target

22 Summary feature attention can alter (1) mean rate, (2) gain and (3) preferred stimuli in V4 baseline, gain and selectivity modulations occur in all possible combinations preference changes could facilitate target detection during visual search (but it’s not a simple matched filter). maximal tuning modulation occurs in neurons with broadest orientation tuning

23 Acknowledgements Gallant Lab (UCB) Jon Touryan Monica Cano Vinas
Julie Golomb Matt Krause Xiao-Jing Wang Gallant Lab (UCB) Stephen David

Download ppt "Sloan-Swartz Summer Meeting 2007"

Similar presentations

Cortical circuits for vision Jamie Mazer Neurobiology of Cortical Systems Lecture 7 March 12, 2012.

Cortical circuits for vision Jamie Mazer Neurobiology of Cortical Systems Lecture 7 March 12, 2012.
Are We Paying Attention Yet? A review of the relation between attention and saccades By Travis McKinney.

Are We Paying Attention Yet? A review of the relation between attention and saccades By Travis McKinney.
Electrophysiology of Visual Attention. Does Visual Attention Modulate Visual Evoked Potentials? The theory is that Visual Attention modulates visual information.

Electrophysiology of Visual Attention. Does Visual Attention Modulate Visual Evoked Potentials? The theory is that Visual Attention modulates visual information.
Neural Network Models in Vision Peter Andras

Neural Network Models in Vision Peter Andras
The Physiology of Attention. Physiology of Attention Neural systems involved in orienting Neural correlates of selection.

The Physiology of Attention. Physiology of Attention Neural systems involved in orienting Neural correlates of selection.
for image processing and computer vision

for image processing and computer vision
Human (ERP and imaging) and monkey (cell recording) data together 1. Modality specific extrastriate cortex is modulated by attention (V4, IT, MT). 2. V1.

Human (ERP and imaging) and monkey (cell recording) data together 1. Modality specific extrastriate cortex is modulated by attention (V4, IT, MT). 2. V1.
Neuronal Coding in the Retina and Fixational Eye Movements Christian Mendl, Tim Gollisch Max Planck Institute of Neurobiology, Junior Research Group Visual.

Neuronal Coding in the Retina and Fixational Eye Movements Christian Mendl, Tim Gollisch Max Planck Institute of Neurobiology, Junior Research Group Visual.
Covert Attention Mariel Velez 4-28-2005. What is attention? Attention is the ability to select objects of interest from the surrounding environment Involuntary.

Covert Attention Mariel Velez What is attention? Attention is the ability to select objects of interest from the surrounding environment Involuntary.
2002/01/21PSCY202-005, Term 2, Copyright Jason Harrison, 20021 The Brain from retina to extrastriate cortex.

2002/01/21PSCY , Term 2, Copyright Jason Harrison, The Brain from retina to extrastriate cortex.
Electrophysiology of Visual Attention. Moran and Desimone (1985) “Classical” RF prediction: there should be no difference in responses in these two conditions.

Electrophysiology of Visual Attention. Moran and Desimone (1985) “Classical” RF prediction: there should be no difference in responses in these two conditions.
Business Minor grade adjustments on Midterm 2 Opportunity to participate in Cognitive Neuroscience and Perception experiment - sign up for Tuesday, Wednesday.

Business Minor grade adjustments on Midterm 2 Opportunity to participate in Cognitive Neuroscience and Perception experiment - sign up for Tuesday, Wednesday.
Disorders of Orienting Lesions to parietal cortex can produce some strange behavioural consequences –patients fail to notice events on the contralesional.

Disorders of Orienting Lesions to parietal cortex can produce some strange behavioural consequences –patients fail to notice events on the contralesional.
Visual Attention More information in visual field than we can process at a given moment Solutions Shifts of Visual Attention related to eye movements Some.

Visual Attention More information in visual field than we can process at a given moment Solutions Shifts of Visual Attention related to eye movements Some.
Consequences of Attentional Selection Single unit recordings.

Consequences of Attentional Selection Single unit recordings.
Computer Science Department, Duke UniversityPhD Defense TalkMay 4, 2005 Fast Extraction of Feature Salience Maps for Rapid Video Data Analysis Nikos P.

Computer Science Department, Duke UniversityPhD Defense TalkMay 4, 2005 Fast Extraction of Feature Salience Maps for Rapid Video Data Analysis Nikos P.
Attention Modulates Responses in the Human Lateral Geniculate Nucleus Nature Neuroscience, 2002, 5(11): 1203-1210 Presented by Juan Mo.

Attention Modulates Responses in the Human Lateral Geniculate Nucleus Nature Neuroscience, 2002, 5(11): Presented by Juan Mo.
The Brain from retina to extrastriate cortex. Neural processing responsible for vision photoreceptors retina –bipolar and horizontal cells –ganglion cells.

The Brain from retina to extrastriate cortex. Neural processing responsible for vision photoreceptors retina –bipolar and horizontal cells –ganglion cells.
Attention Part 2. Early Selection Model (Broadbent, 1958) inputdetectionrecognition FI L T E R Only information that passed the filter received further.

Attention Part 2. Early Selection Model (Broadbent, 1958) inputdetectionrecognition FI L T E R Only information that passed the filter received further.
Introduction ATTENTION SPANS MULTIPLE STIMULUS DIMENSIONS IN MACAQUE VISUAL CORTEX Jitendra Sharma*, James Schummers, Hiroki Sugihara, Paymon Hosseini.

Introduction ATTENTION SPANS MULTIPLE STIMULUS DIMENSIONS IN MACAQUE VISUAL CORTEX Jitendra Sharma*, James Schummers, Hiroki Sugihara, Paymon Hosseini.

Similar presentations

Ads by Google