Holistic, part-based and semantic processes in face recognition: Dissociations and interactions
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Transcript of Holistic, part-based and semantic processes in face recognition: Dissociations and interactions
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Holistic, part-based and semantic processes in face recognition:
Dissociations and interactions
¹ Department of Psychology, University of Toronto
² Rotman Research Institute, Baycrest Centre for Geriatric Care
³ Centre for Vision Research, York University
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In collaboration with:
David AnakiJosee Rivest
Sandra BlackLarry LeachYakir KaufmanBruce Bolster
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• Historical background
• Enduring problems
• New studies
• Dissociations among three agnosic patients
• Prosopagnosia (patient DC)
• Object agnosia (patient CK)
• Pure alexia (patient CM)
• Semantic/associative prosopagnosia (patient AP)
• Interactions among face, object, and semantic systems
Outline
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Historical background
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Bodamer, 1947
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Definition: prosopagnosia
Acquired inability to recognize familiar faces from vision
• Recognition triggered by alternative means: ex.: voice, paraphernalia, gait
• Appropriate semantic information about familiar people
• Good visual acuity • Face recognition may be achieved by a feature-by-
feature approach (?)
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Must NOT be secondary to:• sensory loss • general intellectual loss • memory & language problems • or a combination of these factors
RECOGNITION impairment...
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Associated Recognition Deficits
• Object agnosia
• Pure alexia • Good visual acuity • Good semantic memory/processing• Appropriate orthographic units • No agraphia, no aphasia • Letter-by-letter readers
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But again… dissociations:
• Prosopagnosia with alexia but without object agnosia
(e.g. Buxbaum, Glosser & Coslett, 1998, De Renzi & di Pellegrino, 1998)
• Prosopagnosia with object agnosia but without alexia
(e.g. Humphreys & Riddoch, 1989)
• Object agnosia without prosopagnosia or alexia
(e.g. Humphreys & Rumiati, 1998; Rumiati, Humphreys, Riddoch & Bateman, 1994)
+
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Neuroanatomy
From patients…
• Bilateral damage in the occipitotemporal cortices:- the inferior temporo-occipital regions - the lingual and fusiform gyri (e.g. Damasio, Damasio & Van Hoesen, 1982;
Takahashi, Kawamura, Hirayama, Shiota & Isono, 1995)
• A right hemisphere lesion (in the equivalent areas) - may be sufficient (e.g. De Renzi, 1986a; Landis, Regard & Bliestle, 1988; Rapcsak, Polster,
Comer & Rubens, 1994; Takahashi et al., 1995)
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More evidence…
“Normal” human brains: fMRI studies
- the fusiform gyri (Face Fusiform Area: FFA) (e.g. Kanwisher, Woods, Iacoboni & Mazziotta, 1997)
A PET study- the medial fusiform gyri (areas 19-37) - the right parahippocampal gyrus (area 36) - the anterior region of the temporal poles (Sergent & Signoret, 1992)
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1. Modularity vs. General Purpose2. Representations vs. Processes3. Face-specific vs.Individuation or Expertise4. Focal/Localized vs. Distributed5. Laterilzed vs. Bilateral6. Holistic vs. Analytic or part-based7. Different versions of holistic
Enduring Debates: Are faces special?
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CK - Object Agnosia & Alexia
Behrmann, Moscovitch & Winocur (1994)
Behrmann, Winocur & Moscovitch (1992)
Moscovitch, Winocur & Behrmann (1997)
• 41-year old man• 16 years education (MA degree)• Manager • Closed-head injury: hit by a car when jogging• Bilateral thinning in the occipito-temporal regions
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Behrmann, Moscovitch & Winocur (1994)
Behrmann, Winocur & Moscovitch (1992)
Moscovitch, Winocur & Behrmann (1997)
• Word recognition (reading)
• Object recognition• Residual blindness
in upper left field
IMPAIRED
• Average IQ • Acuity• Upright face recognition• Visual construction abilities• Memory • Semantic knowledge
NORMAL
CK - Object Agnosia & Alexia
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Face module
• Features - primarily internal
• At least two of three needed
• Orientation specific - 0 (upright) to 60-90 degrees
• Global configurational properties– template and/or second order relations
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Face counterpart in object system
• Feature - internal and external
• Distinctive? Verbalizable?
• Orientation sensitive
• Categorical or local relations (jig-saw effect)
• Integration of features and relations
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Interaction of face and face counterpart
• Mapping of features and relations in counterpart to holistic face representations stored in long-term memory (FRUs)
• Interactive activation between systems: face, object, and semantics
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Part-based
OBJECTS WORDS
Holistic
FACES
Upright faces Inverted faces
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Double dissociation
Words X X
CK DC
Faces
Objects
√
X √
X
√
Recognition CM
√
√
Patients
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More dissociations
CK DC
Faces
Objects
Words
√
X
X
√
X
√
Recognition CM
√
X
√
Patients
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CK DC
Faces
Objects
Words
√
X
X
√
X
√
Recognition CM
√
X
√
Patients
Prosopagnosia
Object Agnosia& Alexia
Pure Alexia
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DC - Prosopagnosia
• 54-year old man• 16 years education• Detective for the homicide division of a police
force (on disability)• Colloid cyst hydrocephalus• Posterior cerebral artery infarction
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DC - Prosopagnosia
• Bilateral lesions in the lingual
gyri, Brodmann Areas 18 & 19
R L
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DC - Prosopagnosia
• Bilateral lesions in the lingual gyri: more atrophy to the right fusiform gyrus than the left
R L
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• Superior IQ • • AcuityAcuity• Object recognition• Reading • Visual construction abilities• Space perception • Colour vision• Memory • Semantic knowledge
• Face recognition• Bilateral superior
field deficits
IMPAIRED NORMAL
DC - Prosopagnosia
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Face recognition:
Famous faces
slow —no instant recognition Looks like a “piecemeal” approach
Bob Hope: “I will guess that it is Bob Hope. He has a long nose, his hair cut is him too, a side ways grin; I am not 100% sure that it is him...”
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Hollywood stars• Jerry Seinfeld: “I do not know, an ordinary guy” “Oh, Jerry”
—watched Seinfeld at least once a day • Denzel Washington: “a US ball player”
—described many movies that he was acting in • Michelle Pfeiffer: “A model: Sharon Stone? Christie Brinkley?”
His family members and myselfwith hair covered:
• misidentified his son (who was in the testing room)• misidentified me
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CM - Pure Alexia
• 35-year old man• 15 years of education• Computer programming• Closed-head injury / drugs• Temporal occipital abnormalities on EEG
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CM - Pure Alexia
IMPAIRED NORMAL
• Word recognition (reading): Letter-by-letter reader
• High average IQ• Acuity• Face recognition• Object recognition• Visuo-spatial abilities
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Is there one part-based system?
OBJECTS WORDS
Holistic
FACES
Processing systems
Part-based
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Are there separate part-based systems?
OBJECTS WORDS
Holistic
FACES
Processing systems
Part-based Part-based
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Does part-based face recognition depend on one or both part-based systems?
OBJECTS WORDS
Holistic
FACES
Processing systems
Part-based Part-based
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CK - Object Agnosia & Alexia
Moscovitch, Winocur & Berhmann (1997)
Part-based
OBJECTS WORDS
Intact upright face recognition
Holistic
FACES
Part-based
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CM - Pure Alexia
OBJECTS WORDSFACES
Part-based Part-basedHolistic
Intact face and object recognition
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Can part-based face recognition rely only on systems mediating recognition of objects and words?
OBJECTS WORDS
Holistic
FACES
Part-based Part-based
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Or does it rely on the interaction between part-based and holistic systems ?
OBJECTS WORDS
Holistic
FACES
Part-based Part-based
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DC - Prosopagnosia
OBJECTS WORDS
Holistic
FACES
Part-based Part-based
Intact object and word recognition
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CK CM DC
Faces
Objects
Words
√
X
X
√
X
√ √
X
√
Recognition
Participants
Brain-damaged Control
DCB
√
√
√
Controls
n=12
√
√
√
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• Upright faces
Tasks: Face recognition
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Mean Number of Famous People Recognized from Photos (Max. = 70)
0
10
20
30
40
50
60
70
Controls CK DC DCBCM
perfect score
Mea
n N
umbe
r of
Peo
ple
Rec
ogni
zed
Results
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Caricatures of Famous People
Ronald ReganWoody Allen
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Caricatures of Famous People Recognized (Max. = 29)
Perc
ent m
ean
reco
gnit
ion
0102030405060708090
100
Controls CK DC DCB
Perc
ent c
orre
ct id
enti
fica
tion
0102030405060708090
100
Controls CK DC DCB
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Mothers
Fathers
Child
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Percent of Correct Responses on a Seven-Item Forced Choice Recognition Test for Identifying Each of the
“Parent” Photos from the Photo of a “Child”
0102030405060708090
100
DC DCBControls CK CM
Perc
ent m
ean
reco
gnit
ion
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Tasks: Face recognition
• Fractured • Disguised
Faces
• Inverted
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Who is:
• InvertedJason Alexander
George
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Who is:
• Fractured Oprah
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Who is:
• Disguised Eddie Murphy
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Perc
ent R
ecog
nize
d
Results
Controls CK DC DCBCM0
102030405060708090
100
Percentage of Correct Recognition of Inverted Faces
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Percentage of Correct Recognition of Fractured Faces
Results
0102030405060708090
100Pe
rcen
t R
ecog
nize
d
Controls CK DC DCBCM
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0102030405060708090
100Pe
rcen
t Rec
ogni
zed
Percentage of Correct Recognition of Disguised Faces
Controls CK DC DCBCM
Results
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Summary of findingsDamaged systemsFace
recognitiontasks
Object & Word
Disguised
Upright
Fractured
Inverted
√
X
√
X
Face
X
X
X
X
Word
√
√
√
√
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There are separate part-based systems
OBJECTS WORDS
Holistic
FACES
Part-based Part-based
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OBJECTS WORDS
Holistic
FACES
Part-based Part-based
Only the part-based object system contributes to some aspects
of face recognition
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OBJECTS WORDS
Holistic
FACES
Part-based Part-based
It does so by interacting with an intact upright face-system
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Percent of Upright Cartoon Faces Identified Correctly (Max. = 31)
0102030405060708090
100
Controls CK CM DC DCB
Perc
ent m
ean
reco
gnit
ion
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Percent of Inverted Cartoon Faces Identified Correctly (Max. = 31)
0102030405060708090
100
DC DCBControls CK CM
Perc
ent m
ean
reco
gnit
ion
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Internal Features Inverted
Jacqueline Kennedy Robin Williams
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Mean Correct Recognition of Photos of Famous People When Upright and Intact and
When Internal Features Were Inverted
Internal Inverted (Max. = 11) Intact (Max. = 11)
0
2
4
6
8
10
DC DCBControls CK CM
0
2
4
6
8
10
DCBControls CK CM DC
Mea
n C
orre
ct R
ecog
niti
on
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External Features Inverted
Meg Ryan
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Mean Correct Recognition of Photos of Famous People When Upright and Intact and
When External Features Were Inverted
External Inverted (Max. = 12) Intact (Max. = 12)
0
2
4
6
8
10
12
DC DCBControls CK CM
0
2
4
6
8
10
12
DC DCBControls CK CM
Mea
n C
orre
ct R
ecog
niti
on
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Semantic system
OBJECTS WORDS
holistic
FACES
Recognition
Part-based
Structural representation
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Recognition
Semantic system
OBJECTS WORDS
holistic
FACES
Part-based
Corresponding structural representation
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Misaligned Along the Vertical Midline
Elizabeth Taylor
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Mean Correct Recognition of Photos of Famous People That Are Intact or Misaligned Along the Vertical Midline
(Max. = 10)
Misaligned Vertical Intact
10
0
2
4
6
8
10
DC DCBControls CK CM
0
2
4
6
8
DC DCBControls CK CM
Mea
n C
orre
ct
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Misaligned Along the Horizontal Midline
Madonna
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Mean Correct Recognition of Photos of Famous People That Are Intact or Misaligned Along the Horizontal Midline
(Max. = 10)
Misaligned Horizontal Intact
10
0
2
4
6
8
DC DCBControls CK CM
0
2
4
6
8
10
DC DCBControls CK CM
Mea
n C
orre
ct
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Dan Akroyd
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Mean Correct Forced-Choice Recognition of Single Isolated Face Parts (Eyes, Nose, or Mouth)
for Identified Faces of Famous People (Max. = 15)
Identified Recognized Part
0
2
4
6
8
10
12
14
DC DCBControls CK CM
0
2
4
6
8
10
12
14
DC DCBControls CK CM
Mea
n C
orre
ct R
ecog
niti
on
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Mean Correct Forced-Choice Recognition of Single Isolated Face Parts (Eyes, Nose, or Mouth)
for Non-Identified Faces of Famous People (Max. = 15)
Non Identified Recognized Part
0
2
4
6
8
10
12
14
DC DCBControls CK CM
0
2
4
6
8
10
12
14
DC DCBControls CK CM
Mea
n C
orre
ct R
ecog
niti
on
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Bev Doolittle: The forest has eyes
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CK - Object Agnosia & Alexia
OBJECTS WORDS
Intact upright & disguised face recognition
Holistic
FACES
Part-based Part-based
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DC - Prosopagnosia
OBJECTS WORDS
Holistic
FACES
Part-based Part-based
Impairment of all aspects of face recognition
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Damage to the holistic face system leads to global face recognition deficits
OBJECTS WORDS
Holistic
FACES
Part-based Part-based
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Face Representation
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Depth segregation and “closure” for faces and objects
Mooney Faces and Objects
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Correct Identification of Mooney Faces and Objects
Faces (Max. = 7) Objects (Max. = 9)
0
2
4
6
DC DCBControls CK
0
2
4
6
8
DC DCBControls CK
Mea
n C
orre
ct I
dent
ific
atio
n
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Depth Segregation for Faces and Objects
William Shakespeare
Pierre E. Trudeau
Michael Jackson
Bob HopeEddie Murphy
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Percent Correct Identification and Forced Choice Recognition of Overlapping Caricatures of Famous People (Max. = 27)
Identification Forced Choice Recognition
0
20
40
60
80
100
Controls CK DC DCBCM
0
20
40
60
80
100
Controls CK DC DCBCM
Perc
ent C
orre
ct
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ArcimboldoIdentity of Composite
Faces (i.e. made of objects)