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Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
STARTING POINT #1
STARTING POINT #1
STARTING POINT #1
STARTING POINT #1
STARTING POINT #1
STARTING POINT #1
Occipital Face Area
Occipital Face Area
Occipital Face Area
Occipital Face Area
Occipital Face Area
Occipital Face Area
STARTING POINT #3
STARTING POINT #3
coordinate change
coordinate change
 Faces all share the same basic structure, with the same features
Faces all share the same basic structure, with the same features
 Faces all share the same basic structure, with the same features
Faces all share the same basic structure, with the same features
 Faces all share the same basic structure, with the same features
Faces all share the same basic structure, with the same features
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
Results: perception of spatial relations:
Results: perception of spatial relations:
1a
1a
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
(more distorting - less distorting)
(more distorting - less distorting)
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
1.B) Non-facial perception in apperceptive prosopagnosia:
Within-face spatial processing
Within-face spatial processing
Q. When does a between-object relation become a within-object one
Q. When does a between-object relation become a within-object one
control
control
control
control
control
control
control
control
control
control
control
control
1.D) Global/local perception: If there is a holistic deficit in face
1.D) Global/local perception: If there is a holistic deficit in face
2. FACE DETECTION IN PROSOPAGNOSIA - de Gelder postulated five
2. FACE DETECTION IN PROSOPAGNOSIA - de Gelder postulated five
2. FACE DETECTION IN PROSOPAGNOSIA - de Gelder postulated five
2. FACE DETECTION IN PROSOPAGNOSIA - de Gelder postulated five
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
Face processing: studies in a series of prosopagnosic patients Louvain
Do these conclusions have predictive power
Do these conclusions have predictive power
RCs behavioural data are most consistent with an associative
RCs behavioural data are most consistent with an associative
.BUT is FFA spared
.BUT is FFA spared
fMRI confirms that it is:
fMRI confirms that it is:
fMRI confirms that it is:
fMRI confirms that it is:
fMRI confirms that it is:
fMRI confirms that it is:
Future directions: Perception of other facial structural data
Future directions: Perception of other facial structural data
Future directions: Why are some right PCA patients prosopagnosic and
Future directions: Why are some right PCA patients prosopagnosic and
Future directions: Why are some right PCA patients prosopagnosic and
Future directions: Why are some right PCA patients prosopagnosic and
I was at a conference and I saw this other person walking
I was at a conference and I saw this other person walking
Face processing: studies in a series of prosopagnosic patients

: . , . , Face processing: studies in a series of prosopagnosic patients.ppt zip- 6670 .

Face processing: studies in a series of prosopagnosic patients

Face processing: studies in a series of prosopagnosic patients.ppt
1Face processing: studies in a series 27control. unilateral. bilateral.
of prosopagnosic patients Louvain, Queen 281.D) Global/local perception: If there
Square, November 2006. Trevor Bass Andrea is a holistic deficit in face
Butler Mariya V Cherkasova Shaunak Deepak perception, some postulate that this
Chris Fox Rebecca L Hefter James M should also be revealed as a failure to
Intriligator Julian P Keenan George perceive global level information. Q. Do
Malcolm So Young Moon Numaan Malik Galit they fail to show effects of the global
Yovel Jingher Zhao. Jason JS Barton level of hierarchical Navon letters?
Olivier Felician Beatrice de Gelder 29Global/local 8 apperceptive
Nouchine Hadjikhani Todd Handy Nancy prosopagnosic patients (1 developmental)
Kanwisher Dara S Manoach Margaret OConnor Longer RT in general, but normal pattern
Dan Z Press Max Riesenhuber. of global influences.
2Overview: I. Starting points II. 302. FACE DETECTION IN PROSOPAGNOSIA -
Prosopagnosia 1. face perception A. de Gelder postulated five separate face
facial spatial relations B. non-facial processing mechanisms, in which face
perception C. between- and within-object detection and face recognition are
spatial processing D. global/local distinct.. Riesenhubers computational
processing 2. face detection 3. face models suggest that detection and
imagery III. Summary IV. Future recognition are merely points on a
directions perceptual continuum. Are prosopagnosic
3STARTING POINT #1. Cognitive models of subjects normal at detecting faces?
face processing propose a branching RUBINS VASE EXPERIMENT:
hierarchy of stages. 31
4Occipital Face Area. Superior Temporal 32
Sulcus. Fusiform Face Area. STARTING POINT 33How do we diagnose associative
#2. Neuroimaging data show a network of prosopagnosia? Indirect conclusion - if
face processing regions in human cortex. perception seems normal, must be
5STARTING POINT #3. A variety of associative What we need is a method of
lesions cause prosopagnosia. 8 adult-onset assessing the status of facial memory
lesions: 5 bilateral 1 bilateral anterior stores, without having to go through a
temporal trauma 2 bilateral perceptual route: ... imagery. What
occipito-temporal trauma, gunshot 2 right kind of face imagery ? Is there a
anterior temporal/occipital small left distinction between local features and
temporal lesions trauma, encephalitis 3 holistic or overall facial
unilateral 3 right occipito-temporal configuration? 3. FACE IMAGERY IN
stroke (2), tumor 3 childhood-onset PROSOPAGNOSIA.
lesions: head trauma occipital 34Face imagery questionnaire. 37
polymicrogyria respiratory arrest, questions, AFC 2 choice. 31 controls, not
posterior gyral atrophy. at ceiling (93% correct) 19
6Is there a relation between cognitive feature-related imagery Who has the more
models and anatomic data? Can prominent nose? Meryl Streep Nicole Kidman
prosopagnosia tell us something about Who has a moustache? Martin Luther King Jr
structure-function correlations? occipital Louis Armstrong 18 global face shape
face area? superior temporal sulcus? imagery Who has the narrower face? Cher
fusiform face area? anterior temporal? Martha Stewart Who has the more angular
7I. PROSOPAGNOSIA. The inability to face? George Washington Abraham Lincoln
recognize previously seen faces, with calculate binomial limits of chance (does
relative sparing of other perceptual, it exist?), and 95% prediction interval
cognitive and memory functions. Broad for normal imagery (is it impaired?).
Subtypes: 1. Apperceptive - failure to 35Imagery results.
generate a sufficiently accurate percept 36Summary - imagery results: bilateral
to allow a successful match to stores of occipitotemporal lesions impair but do not
previously seen faces. 2. Associative - abolish face imagery. unilateral
accurate percept, but failure to match right-sided occipitotemporal lesions
because of loss of facial memory stores or impair imagery for global facial structure
disconnection from them. Family of more than imagery for features. anterior
subtypes corresponding to defects at temporal lesions abolish face imagery.
different stages in a cognitive model of Barton JJS, Cherkasova M. Face imagery and
face processing. its relation to perception and covert
81. PERCEPTION IN PROSOPAGNOSIA Q. What recognition in prosopagnosia. Neurology
kind of perceptual deficit can affect 2003; 61: 220-225.
recognition of individual faces yet spare 37III. SUMMARY (a) Tentative
basic-level object recognition ? object structure-function correlations:
recognition theories: a. entry-level bilateral occipitotemporal lesions (in the
recognition, satisfied by coarse region of the FFA): have a severe failure
categorical structural descriptions (i.e. to perceive coordinate spatial
recognition by component theory, geons, relations, are only mildly impaired face
edge-based) b. precise metrical imagery, consistent with an apperceptive
(coordinate) analysis for exemplar prosopagnosia. right occipitotemporal
recognition. lesions: are similar to bilateral ones,
9coordinate change. categorical change. except for preserved imagery for facial
10 Faces all share the same basic features, and less severe prosopagnosia
structure, with the same features (two (d measures). anterior temporal
eyes, nose, mouth) in the same arrangement lesions: markedly impair face imagery,
(e.g. eyes above nose) What with only subtle (integrative?) effects on
distinguishes one face from another are perceiving spatial relations, consistent
subtler variations in the precise metrical with an associative prosopagnosia.
structure and arrangement of these 38III. SUMMARY (b) Characteristics of
elements. Coordinate (2nd order spatial the apperceptive defect: This defect in
relation) change. Categorical (1st order processing structure affects other
spatial relation) change. non-face stimuli, and may be one
111.A) Perception of spatial relations mechanism by which recognition of
in prosopagnosia What is the perceptual exemplars of other object classes is
defect in prosopagnosia ? Perceiving impaired. This defect is specific for
precise structural coordinates (e.g. within-object spatial representations.
second-order spatial relations) may be Reduced high spatial frequency contrast
important in recognizing specific sensitivity may play a role.
exemplars of complex 3-D structures. Global/local processing is not affected.
Normal subjects have difficulty Figure-ground assignment is impaired and
recognizing inverted faces, and studies more difficult with faces.
show that this is accompanied by 39Do these conclusions have predictive
difficulty perceiving the spatial power? RC: 25 year old man HSV
relations of facial features. Barton JJS, Encephalitis 2 years ago. BEHAVIOURAL
Keenan J, Bass T. Discrimination of TESTING: Face familiarity: impaired Famous
spatial relations and features in faces: faces: d = 0.61 (N>2.9) Relatives
effects of inversion and viewing duration. faces: d = 0.87 Perception of faces -
Brit J Psychol 2001;92: 527. Barton JJS, good Benton Face recognition test = 45/54
Deepak S, Malik N. Attending to faces: Spatial relations : 2 second; unlimited
change detection, familiarization, and time - eye 80% (N> 73); 93% (N> 68)
inversion effects. Perception 2003; 32: - mouth 70% (N> 72); 89% (N> 55)
15. Morphed faces - same view = 77.8%
12 (N>78) - varying view = 62.5%
13? (N>57). Short term memory for faces -
14 poor Warrington Recognition Memory test
151.A) Perception of spatial relations faces = 27/50 ; words = 45/50.
in prosopagnosia What is the perceptual 40RCs behavioural data are most
defect in prosopagnosia ? Perceiving consistent with an associative
precise structural coordinates (e.g. prosopagnosia: Prediction: RCs
second-order spatial relations) may be neuroimaging will show: 1. Bilateral
important in recognizing specific anterior temporal lesions 2. Sparing of
exemplars of complex 3-D structures. FFA.
Normal subjects have difficulty 41.BUT is FFA spared? PLAN: do an fMRI
recognizing inverted faces, and studies experiment on RC.
show that this is accompanied by 42fMRI confirms that it is: Result: RC
difficulty perceiving the spatial does have an FFA, AND it shows adaptation
relations of facial features. Q. Are effects to identity. This supports the
prosopagnosics impaired at perceiving hypothesis that the FFA is involved in
coordinate spatial relations? Barton perception of facial structure, and that
JJS, Keenan J, Bass T. Discrimination of its loss leads to apperceptive
spatial relations and features in faces: prosopagnosia.
effects of inversion and viewing duration. 43fMRI confirms that it is:
Brit J Psychol 2001;92: 527. Barton JJS, Event-related potentials in RC also show a
Deepak S, Malik N. Attending to faces: face-selective N170 response in his right
change detection, familiarization, and occipitotemporal region, and possibly a
inversion effects. Perception 2003; 32: distinction between familiar and anonymous
15. faces in later responses. Left
16 occipitotemporal. Right occipitotemporal.
17Results: perception of spatial N170. familiar faces. anonymous faces.
relations: Barton JJS, Press DZ, Keenan objects.
JP, OConnor M. Lesions of the fusiform 44Future directions: Perception of other
face area impair perception of facial facial structural data?
configuration in prosopagnosia. Neurology 45Future directions: Why are some right
2002; 58: 71. PCA patients prosopagnosic and others not?
181a. The geometry effect: Integrating P.001 non-prosopagnosic. S.009
spatial relations across the face: S.008, prosopagnosia.
with anterior temporal lesions, does 46I was at a conference and I saw this
relatively well at discriminating single other person walking. I thought it was
spatial relations (mouth or eye) in a probably someone I knew and so I smiled at
target face. Q. How does she integrate them and started to greet them, only to
spatial information across the whole face? realize that it was my own face and I was
Consider aspect ratio of eyes to mouth. looking at a mirrored wall. (LH - subject
Combined moves of eyes and mouth can 011).
preserve the aspect ratio or distort it. http://www.neuroophthalmology.ca/UBCNeuroO
19 /JBarton/FrJBhome.html.
20(more distorting - less distorting). 47NORMAL PERCEPTUAL STUDIES Barton JJS,
GEOMETRY EFFECT: Results: Normal Keenan JP, Bass T. Discrimination of
subjects are faster and more accurate at spatial relations and features in faces:
discriminating more distorting effects of inversion and viewing duration.
combinations than less distorting ones in Brit J Psychol 2001; 92: 527-49. Barton
upright faces, BUT NOT in inverted faces. JJS, Deepak S, Malik N. Attending to
S.008 does not show a significant faces: change detection, familiarisation
geometry effect. Hence she perceives and inversion effects. Perception 2003;
spatial changes but does not integrate 32: 15-28. Malcolm GL, Leung C, Barton
this information across the face. upright. JJS. Regional variation in the inversion
inverted. effect for faces: different patterns for
211.B) Non-facial perception in feature shape, spatial relations, and
apperceptive prosopagnosia: external contour. Perception 2004; 33:
Neuropsychology visual object and space 1221-31. Barton JJS, Radcliffe N,
perception battery Ghent overlapping Cherkasova MV, Edelman J, Intriligator JM.
figures Benton line orientation Information processing during face
Within-category vegetable recognition: the effects of familiarity,
identification. Low level perception inversion and morphing on scanning
static contrast sensitivity luminance fixations. Perception 2006: 353:1089-105
saturation spatial resolution dot Fox CJ, Barton JJS. What is adapted in
displacement curvature discrimination. face adaptation? The neural
22 Most patients had difficulty with representations of expression in the human
fruit/vegetable identification normal 0-3 visual system. Brain Res, in press
errors patients 3-20 errors Most PROSOPAGNOSIC STUDIES Barton JJS,
consistent defects in occipitotemporal Cherkasova M, OConnor M. Covert and overt
lesions were: - reduced mid-high spatial recognition in acquired and developmental
freq. (4.2 - 8.4 cycles/) contrast prosopagnosia. Neurology 2001; 57: 1161-7.
sensitivity - reduced perception of dot Barton JJS, Press DZ, Keenan, JP, OConnor
displacement Bilateral lesions reduced M. Lesions of the fusiform face area
thresholds for saturation perception, impair perception of facial configuration
scores for overlapping figures. in prosopagnosia. Neurology 2002; 58:
Curvature and line orientation impaired in 71-8. Barton JJS, Cherkasova M, Press DZ,
S.006 only, who had the most difficulty Intriligator J, OConnor M. Developmental
with basic-level object recognition. 1.B) prosopagnosia: a study of three patients.
Non-facial perception in apperceptive Brain and Cognition 2003; 51: 12-30.
prosopagnosia. Barton JJS, Cherkasova, MV, Barton JJS, Cherkasova M. Face imagery and
Press DZ, Intriligator JM, OConnor M. its relation to perception and covert
Perceptual functions in prosopagnosia. recognition in prosopagnosia. Neurology
Perception 2004; 33: 939. 2003; 61: 220-225. Barton JJS, Zhao J,
231.C) Within-object versus Keenan JP. Perception of global facial
between-object spatial representations: geometry in the inversion effect and
Prosopagnosics fail at the coordinate prosopagnosia. Neuropsychologia 2003; 41:
spatial relations in faces or abstract dot 1703-1711. Joubert S, Felician O, Barbeau
patterns. What about other visuospatial E, Sontheimer A, Barton JJS, Ceccaldi M,
functions? Within-object and Poncet M. Impaired configurational
between-object spatial representations may processing in a case of progressive
be functionally and anatomically distinct: prosopagnosia associated with right
Between-object perception can show the temporal lobe atrophy. Brain 2003; 126:
opposite direction of neglect to 2537-50. de Gelder B, Frissen I, Barton J,
within-object neglect. Humphreys G. Phil Hadjikhani N. A modulatory role for facial
Trans R Soc Lond B 1998;353:1341 Patient expressions in prosopagnosia. Proc Nat
with bi-parietal lesions (dorsal pathway) Acad Sci 2003: 100: 13105-10. Barton JJS,
has normal within-object but abnormal Cherkasova MV, Hefter R. The covert
between-object spatial judgments. Cooper priming effect of faces in prosopagnosia.
A, Humphreys G. Neuropsychologia Neurology 2004; 63: 2062-8. Barton JJS,
2000;38:723 Q. Do our patients (with Cherkasova M, Press DZ, Intriligator J,
ventral pathway lesions) have the opposite OConnor M. Perceptual function in
dissociation: abnormal within-object but prosopagnosia. Perception 2004; 33:
normal between-object spatial perception? 939-56. Barton JJS, Cherkasova MV.
24Within-face spatial processing. Impaired spatial coding within-objects but
Between-face spatial processing. Which not between-objects in prosopagnosia.
face is furthest away from the other two? Neurology 2005; 65: 270-4. Barton JJS.
Which face is different? Disorders of face perception and
25Results: within. within - object. recognition. Neurologic Clinics 2003; 21:
between - object. Conclusion: 521-548. AUTISM SPECTRUM STUDIES Barton
prosopagnosic subjects have good JJS, Cherkasova MV, Hefter R, Cox TA,
between-object perception. Barton JJS, OConnor M, Manoach DS. Are patients with
Cherkasova MV. Impaired spatial coding social developmental disorders
within-objects but not between-objects in prosopagnosic? Perceptual heterogeneity in
prosopagnosia. Neurology 2005; 65: 270. the Asperger and socio-emotional
26Q. When does a between-object relation processing disorders. Brain 2004; 127:
become a within-object one? (A 1706-16. Hefter R, Manoach DS, Barton JJS.
competition between spatial Perception of facial expression and facial
representations). Task 1: which apex is identity in patients with developmental
further away from the other two? Task 2 social processing disorders. Neurology
(B?lints patient): is this triangle 2005; 65: 1620-5.
symmetric or asymmetric?
Face processing: studies in a series of prosopagnosic patients.ppt
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Face processing: studies in a series of prosopagnosic patients

Face processing: studies in a series of prosopagnosic patients

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