Object and face recognition

Slides:



Advertisements
Similar presentations
Chapter 4: The Visual Cortex and Beyond
Advertisements

Higher Visual Areas Anatomy of higher visual areas
Midterm 1 Oct. 21 in class. Read this article by Wednesday next week!
V1 Physiology. Questions Hierarchies of RFs and visual areas Is prediction equal to understanding? Is predicting the mean responses enough? General versus.
Chapter 4: Cortical Organization
Chapter 44 Visual Perception of Objects Copyright © 2014 Elsevier Inc. All rights reserved.
Fast Readout of Object Identity from Macaque Inferior Tempora Cortex Chou P. Hung, Gabriel Kreiman, Tomaso Poggio, James J.DiCarlo McGovern Institute for.
Are faces special?. Brain damage can produce problems in face recognition - even own reflection (Bodamer, 1947) Prosopagnosia usually results from localized.
Neural Correlates of Visual Awareness. A Hard Problem Are all organisms conscious?
1.Exams due 9am 16 th. (grades due 10am 19 th ) 2.Describe the organization of visual signals in extra-striate visual cortex and the specialization of.
Visual Fields KW Fovea on Cortex KW 8-22 Occipital Lobes are Independent KW 8-24.
Lesions of Retinostriate Pathway Lesions (usually due to stroke) cause a region of blindness called a scotoma Identified using perimetry note macular sparing.
Evidence from Lesions: Agnosia Lesions (especially in the left hemisphere) of the inferior temporal cortex lead to disorders of memory for people and things.
Test on Friday!. Lesions of Retinostriate Pathway Lesions (usually due to stroke) cause a region of blindness called a scotoma Identified using perimetry.
Higher Processing of Visual Information: Lecture III
Read this article for Friday Oct 21! Trends in Neuroscience (2000) 23, Hint #1: there are at least 3 ways of getting this article Hint #2: none.
Visual Pathways W. W. Norton Primary cortex maintains distinct pathways – functional segregation M and P pathways synapse in different layers Ascending.
You have a test next week!
Writing Workshop Find the relevant literature –Use the review journals as a first approach e.g. Nature Reviews Neuroscience Trends in Neuroscience Trends.
Searching for the NCC We can measure all sorts of neural correlates of these processes…so we can see the neural correlates of consciousness right? So what’s.
Cognitive Neuroscience z What do neurons have to do with cognition? z How can neurons do complex things? z How do we know how the brain works? z What.
Read Lamme (2000) TINS article for Wednesday. Visual Pathways V1 is, of course, not the only visual area (it turns out it’s not even always “primary”)
Dorsal and Ventral Pathways
Post-test review session Tuesday Nov in TH241.
Final Review Session Neural Correlates of Visual Awareness Mirror Neurons
The visual pathways. Ventral pathway receptive field properties 0 1 TE receptive field V4 receptive field V1 receptive field.
The Retina has layers of cells
Visual Cognition I basic processes. What is perception good for? We often receive incomplete information through our senses. Information can be highly.
Color vision Different cone photo- receptors have opsin molecules which are differentially sensitive to certain wavelengths of light – these are the physical.
VISUAL PATHWAYS Organization of LGN of thalamus Organization of Visual Cortex What Stream How Stream The Binding Problem.
Visual Cognition I basic processes. What is perception good for? We often receive incomplete information through our senses. Information can be highly.
PY202 Overview. Meta issue How do we internalise the world to enable recognition judgements to be made, visual thinking, and actions to be executed.
Higher Processing of Visual Information: Lecture II
Basic Processes in Visual Perception
The visual system Lecture 1: Structure of the eye
Categorization: Scenes & Objects (P) Lavanya Sharan March 16th, 2011.
Visual Cortex: V1. V1 lateral view medial view calcarine sulcus.
Consequences of Attentional Selection Single unit recordings.
Photo, p. 476 Ranulfo Romo. Figure 23.1 Vibration Discrimination Task and Performance.
Extrastriate Cortex and Higher Cortical Deficits Adler’s Physiology of the Eye 11th Ed. Chapter 31 - by Boyd & Matsubara
Vision Biology/Psychology Some introductory thoughts Sensory world in general is basically a representation of the real world So, we have a rich.
Sensory systems basics. Sensing the external world.
Table of Contents Chapter 4 Sensation and Perception.
THE VISUAL SYSTEM: EYE TO CORTEX Outline 1. The Eyes a. Structure b. Accommodation c. Binocular Disparity 2. The Retina a. Structure b. Completion c. Cone.
Neural coding (1) LECTURE 8. I.Introduction − Topographic Maps in Cortex − Synesthesia − Firing rates and tuning curves.
The primate visual systemHelmuth Radrich, The primate visual system 1.Structure of the eye 2.Neural responses to light 3.Brightness perception.
Vision Psychology Some introductory thoughts Sensory world in general is basically a representation of the real world Sensory world in general is.
fMRI Methods Lecture 12 – Adaptation & classification
Chapter 8: Perceiving Motion
Figure 2.7. Number of neural impulses in selected single cells of the monkey brain when shown differing pictures. These neurons fire the most when a face.
Vision. 2 Brodmann Original Calcarine 17 Collateral Sulcus Fusiform Gyrus 18.
Chapter 3: Neural Processing and Perception. Neural Processing and Perception Neural processing is the interaction of signals in many neurons.
Biological Modeling of Neural Networks: Week 12 – Decision models: Competitive dynamics Wulfram Gerstner EPFL, Lausanne, Switzerland 12.1 Review: Population.
Words in the brain Slide #1 김 민 경 Chap 4. Words in the brain.
Higher Visual Areas 1.Anatomy of higher visual areas 2.Two processing pathways - “ Where ” pathway for motion and depth - “ What ” pathway for form and.
Fundamentals of Sensation and Perception RECOGNIZING VISUAL OBJECTS ERIK CHEVRIER NOVEMBER 23, 2015.
Week 4 Motion, Depth, Form: Cormack Wolfe Ch 6, 8 Kandell Ch 27, 28 Advanced readings: Werner and Chalupa Chs 49, 54, 57.
Face Recognition in the Brain Arash Afraz.
Figure 12.1 Central projections of retinal ganglion cells
Outline Of Today’s Discussion 1.LGN Projections & Color Opponency 2.Primary Visual Cortex: Structure 3.Primary Visual Cortex: Individual Cells.
The Human Visual System Background on Vision Human vision – the best system around Deep network models.
The visual system eye thalamus lateral geniculate nucleus (LGN) visual cortex The visual system s.
Chapter 4: Cortical Organization
Temporal receptive windows in the brain NBE-E5700 Introduction to Cognitive Neuroscience Gustaf Lönn,
Visual Computation and Learning Lab
Uri Hasson, Ifat Levy, Marlene Behrmann, Talma Hendler, Rafael Malach 
Visual Cortex   Vision Science Lectures in Ophthalmology Curtis Baker.
The Visual System: Higher Cortical Mechanisms
Uri Hasson, Michal Harel, Ifat Levy, Rafael Malach  Neuron 
Volume 27, Issue 2, Pages (August 2000)
Presentation transcript:

Object and face recognition The neural basis of Object and face recognition

Ventral pathway receptive field properties 2 TE receptive field V4 receptive field V1 receptive field

Responses of IT neurons to various stimuli Firing rate Stimulus

Neural Coding

The question of specificity: Is a face cell truly a “face specific” #1 #10 #100

Face selectivity in single units human MTL (Jennifer Aniston cell)

Face selectivity in single units human MTL

Face neuron clusters in IT

Responses of IT (TE) neurons

Tanaka’s stimulus reduction method

Tanaka et al, 1991

Tanaka Features

Columns in IT

Optical imaging in IT cortex

Columns in IT (seen with optical imaging)

Columns in IT

Microstimulation of face populations in IT

Cortical Microstimulation biases perceptual decisions

fMRI

The human visual pathways

Object-Selective Regions in the Human Brain Lateral Occipital Complex: LOC > lateral view 10-4 10-10 10-4 left hemisphere right hemisphere 10-10 10-4 ventral view Malach et al., PNAS 1995

Cue-independent representations Objects from motion Left hemisphere Objects from luminance lateral Objects from texture Grill-Spector et al. , Neuron 1998

Are Faces Special? Having a dedicated representation

Face-related activation

Whole vs. Parts 1 2V 4 16 64 256 2h

Whole vs. Parts

Face blindness (Prosopagnosia)

Is face blindness associated with a disfunctional FFA NO!

But it may depend on the integrity of the face network (its connections with other areas)

Functional organization of the human ventral areas Hasson et al., 2003

Distributed & overlapping representation of faces & objects in ventral temporal cortex Haxby et al., 2001

Mapping the similarity between visual categories A division between animate and inanimate objects Kriegskorte et al., 2008

Mapping is similar in humans and monkeys

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2024 SlidePlayer.com Inc. All rights reserved.