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Seeing the ‘other’
Sensory underpinnings of social-cognitive
development and dysfunction
Overview • Introduction• The mature
neurophysiology of biological motion (BM) processing
• BM processing in typical development and in ASD
• BM and social cognition
Biological motion and social cognition
• Social cognition - the encoding and processing in the brain of social information.
• Biological motion (BM) is a prime example of a visual stimulus from which the brain extracts socially salient information.
Biological motion
Biological motion and social cognition
• Intact BM processing is essential for healthy social interactions.
• Complex social networks rely heavily on BM information to accomplish social tasks across the brain.
Mirror neuron system
• “Unlike inanimate objects, humans have the distinct property of being ‘like me’ in the eyes of the observer.
• This allows us to use the same systems that process knowledge about self-performed actions, self-conceived thoughts, and self-experienced emotions to understand actions, thoughts, and emotions in others.”
Obermann and Ramachandran, 2007
Q: How is social information extracted from sensory data?
global
STS
global
local
“Self” percept
local
Auditory processing
language
Visual form
Visual motion
“Other” percept
A: Not simply.
EBA
affect
MT
Motivation / Decision making motor planning
cerebellum
Visual input
Auditory input
Attentional / Motor output
premotor
Visual processing
fusiform
Biological motion in the brain
Point-light displays
• Humans are capable of detecting socially salient signals from extremely impoverished sensory information.
• For example, we can detect diverse social information from so-called biological motion point light displays e.g. emotion, mood, gender, and body-type.
Signatures of biological motion
• Motion coherence and opponency• Minimum jerk• Global form
Gunnar Johansson (1911-1998)
Point-light displays
Point-light displays
BioMotionLab2.swf
Biological motion
• Biological motion (BM) detection is innate to the healthy human brain.
• BM processing involves multiple sites across the brain.
• The underlying neurophysiology remains largely unexplored.
When and where is biological motion processed in the mature brain?
Is it a simple, involuntary process?
Experiment 1: Biological motion and attention
neurophysiology
Biological motion and attention
• Paradigm 1: Naïve subjects respond to a distractor target (dot-color) enabling the monitoring of the automatic processing of unattended BM.
• Paradigm 2: Subjects are explicitly informed of the presence of BM, and respond accordingly, enabling the monitoring of attentional processes.
Biological motion and attention• High-density EEG
enables a thorough mapping of bilateral visual-social pathways.
• Source localization algorithms enable the estimation of neuronal generators at different temporal stages of the process.
Hans Berger (1873-1941)
Initial paradigmSample stimuli: on the left are still-frames depicting normal biological activity in point-light animation sequences. On the right are the scrambled counterparts of the biological motion sequences.
unattended
attended
VEPs for the unattended (a) and attended (b) biological motion (BM) tasks. Blue lines indicate the response to BM stimuli, red lines indicate the response to scrambled stimuli, and green lines represent the difference waves.
Scalp maps
Posterior topographic scalp maps of the response during both experimental conditions and the difference maps between them at selected time-points.
Statistical cluster plotsBM vs. SM
unattended
attended
Color-plot of t-values for the differences between canonical biological motion point-light displays and their scrambled counterparts in the unattended (a) and attended (b) tasks.
Brain Electrical Source Analysis
• BESA models intracranial dipoles that produce observed scalp waveforms, using iterative adjustments to reduce the variance between the solution and the observed data.
• The upper bound of the number of modeled dipole sources was determined using an unconstrained test dipole.
Brain Electrical Source AnalysisScalp maps of the difference between BM and SM responses and the corresponding source localizations. A. Talairach: x = 35, y = -69, z = -
2; explained variance [EV] = 91%
B. x = ±40, y = -69, z = 13; EV = 80%
C. x = 23, y = -80, z = 20; EV = 81%
D. x = ±40, y = -65, z = 7; EV = 89%
E. x = -37, y = -76, z = 16; x = 32, y = -77, z = 10; EV = 93%
Brain Electrical Source Analysis
Summary of findings in some recent neuroimaging studies as related to our source localizations. See, e.g., [KO] Tyler et al, 2005; [hMT] Becker et al, 2008; [pSTS] Kontaris et al, 2009. (KO=kinetic occipital area; hMT=human homolog of monkey medial temporal area; pSTS=posterior superior temporal sulcus)
How do these neurophysiological processes develop in the healthy brain?
Biological motion processing in typical development
Some basic stats
Groups N (female) Age in yrs. VIQ PIQ FSIQ AS,
autism
cASD 35 (4) 10.48 (2.27) 7.1-15.7 101.66
(22.47)108.26 (18.54)
105.40 (21.26) 13, 16
TDs 46 (22) 11.22 (2.90) 6.1-16.9 116.59
(14.26)108.24 (12.88)
113.98 (13.87) N/A
New paradigm
UM SM IM
Inversion
scrambled.swf
Developing biological motion VEP
TDs unattended
PO3
PO7
P9
PO4
PO8
P10Oz
FzPO3
PO7
P9
PO4
PO8
P10Oz
Fz
TDs attended
PO3
PO7
P9
PO4
PO8
P10Oz
FzPO3
PO7
P9
PO4
PO8
P10Oz
Fz
TDs 10 μV
PO3
PO7
P9
PO4
PO8
P10Oz
Fz
100 msunattended
attended
Is biological motion processing affected in autism spectrum disorders?
Visual roots to social dysfunctions
Biological motion processing in children with autism
spectrum disorders
Autism spectrum disorders1. qualitative impairment in social
interaction
2. qualitative impairments in communication
3. restricted repetitive and stereotyped patterns of behavior, interests and activities
Autism spectrum disordersSelect symptoms:
– Has heightened or low senses of sight, hearing, touch, smell, or taste– Cannot start or maintain a social conversation– Does not adjust gaze to look at objects that others are looking at– Does not refer to self correctly (for example, says "you want water" when
the child means "I want water")– Does not make friends– Does not play interactive games– May not respond to eye contact or smiles, or may avoid eye contact– May treat others as if they are objects– Prefers to spend time alone, rather than with others– Shows a lack of empathy– May withdraw from physical contact because it is overstimulating or
overwhelming– Doesn't imitate the actions of others
What is the common thread?
“Mind blindness”
•“extreme male brain” theory of ASD• mirror neuron system dysfunction
• (for the unfamiliar?)
Affective social processingempathizing
autism
Ontological social processingsystemizing
behaviorism
ASD and biological motion
Herrington et al., 2007
• There is a controversy in the literature regarding the presence of BM-processing differences in ASD.
• By using high-density EEG, the spatiotemporal pathways used by TD and ASD populations can be mapped out, resolving this debate.
ASD and biological motion
Neurophysiology of biological motion processing in ASD
TDs unattended
PO3
PO7
P9
PO4
PO8
P10Oz
FzPO3
PO7
P9
PO4
PO8
P10Oz
Fz
cASD unattended
PO3
PO7
P9
PO4
PO8
P10Oz
FzPO3
PO7
P9
PO4
PO8
P10Oz
Fz
TDs attended
PO3
PO7
P9
PO4
PO8
P10Oz
FzPO3
PO7
P9
PO4
PO8
P10Oz
Fz
cASD attended
PO3
PO7
P9
PO4
PO8
P10Oz
FzPO3
PO7
P9
PO4
PO8
P10Oz
Fz
cASD vs. TDs
PO3
PO7
P9
PO4
PO8
P10Oz
FzPO3
PO7
P9
PO4
PO8
P10Oz
Fz
Mind A
Interactive medium
Mind B
1 0 1
0 0 1
1 1 0
Motor output
Motor output
Sensory input
Sensory input
1 0 1
0 0 1
1 1 0
1 0 1
0 0 1
1 1 0
A
A
B
B
A
B
B
A
B
A
A
BRepresentation
of other’s internal states
Representation of other
Representation of self’s internal
states
Representation of self
Representation of medium
including BM
Representation of medium
including BM
External interactive
environment
1 0 1
0 0 1
1 1 0
Motor output
Sensory input
1 0 1
0 0 1
1 1 0
A
A
B
B
A
B
Representation of other’s
internal statesRegistry of self’s internal states
Representation of external
environment including BM
1
1
0
1
0
1
Representation of self’s motor
impact on environment
Representation of other’s motor
impact on environment
Mind A
EBA/FBA
pSTS
PPC
e.g. cingulate
premotor cortex
Conclusions
• Mature BM processing: – 3 phases
• Normal development: – Effects become automatic with age– No early phase– No attentional effects
• ASD:– Like younger less automatic?
• Dr. John J. Foxe• Dr. Sophie Molholm• Edel Flynn• Dr. Pal Czobor• Dr. Pejman Sehatpour• Dr. Adam C. Snyder • Dr. Lars Ross• Dr. Simon Kelly• The rest of the crew (past and present but not future) at the CNL• The victims who participated• My parents• My wife• The boys
Credits
Supplementary material
Have some coffee first.
• Gender effects• Schizophrenia
– Pilot data• The inversion effect
– background• Further directions• Theory and philosophy of mind• Ncl Closure effects and “objectness”• Even more pilot analyses
– Minimum norms– More clusterplots
• etc.
Gender effects?
Pilot data
unattended♂
♀
♀♂
attended
♂
♀
♀♂
Girls-boys minimum jerk .01
Girls-boys minimum jerk .05
attended
unattended
♂ ♀
♀♂
upright-scrambled
Unattended – between groups
♀♂
Unattended upright-scrambled♀; N=6
♀♂
Unattended upright-scrambled♂; N=12 (6-12)
♀♂
TD 8-12 N=11 unattendedupright-scrambled
α=0.1
♀♂
Unattended BMGender effect 0.10
♀♂
Unattended BMGender effect 0.05
♀♂
Attended BMGender effect 0.01
♀♂
Attended BMGender effect 0.05
♀♂
Attended BMGender effect 0.10
♀♂
Gender effectunattended attended
♀♂
Further directions
Biological motion processing in schizophrenia
Schizophrenia – pilot data (N=8)unattended
Schizophrenia – pilot data (N=8)attended
Schizophrenia pilot dataT-clusterplot (N=8)
Unattended upright vs. scrambled Attended upright vs. scrambled
Strawperson
Supplement:more future directions
Supplement:more future directions
Future directions• Audiovisual eye gaze and autism (ala Klin et al, 2009)• Sensorimotor integration and ToM as a multisensory
(proprioceptive) phenomenon• Electrophysiology of mentalizing and affect in ASD and/or
schizophrenia• Ontological social processing…• Closure and mismatch as neurocognitive currencies• (way) future research – social-smiling infants: mindless reflex
or social reward/ToM• Audiovisual interpolated and full bodies and faces vs.
coherent/meaningful/inanimate motions
Low level sensory processes vs. higher order social cognition
• VEPs and visual field confounds– Biological motion vs. scrambled and inverted
displays– Scrambled “biological motion” vs. non-biological
coherent motion (and Aristotelian spheres/ motion and mind…)
– Online “minded” event and artifacts… (random structures vs. teleological structures (tools/art/etc.)
– Affect and ASD
Social cognition and merging visual streams
Dorsal/ventral facial affect processing
Fusiform vs. amygdala
Vuilleumier et al., 2003
Local feature and facial emotion processes
Local feature and facial emotion processes
Local feature and facial emotion processes
Higher cognitive social processing and electrophysiology
• Semantic-social class formation
Social class formation
• “Properties” and “objects”• Social construct formation• Theory of mind
Abstract vs. concrete perception
Necessary / abstract• Conceptual• Mathematical / formal
science• Possibility super-space/set• Denominator in probabilistic
reasoning / stats / signal detection
• E.g.: – 1+1=2– p^~p=F
Actual / concrete• Sensory• Selection• Subspace• Possibility subspace• Numerator in prob.
Reasoning• E.g.:
– The sky is blue.– It weighs 13 lbs.
Semantic word classes / percepts
social• I
• You• He• She• Person • Mind• Consciousness• Thought• See• Hear
• Feel• Sense• Emotion• Want• Desire• Love• Hate• Guilt
concrete• It• Inanimate• Object• Matter• Energy• Space • Time• Function• Equation• Law• Event
• Particle• Motion• Position• Size• Acceleration• Color• Temperature• Sound
Equivalence class formation
Equivalence class formation
Equivalence class formation
Biological motion games
ToM games
•Identity scales (self friend stranger foe) and BM perception in TDs and ASD
Audiovisual eye-gaze
Audiovisual Mismatch
Contextual – feedback processes
“m-eye-th”
Emotion wheel
Plutchik, 1980
Supplementary slides
What is “social cognition”?
• Environmental processing– Sensory data (mismatches)– Data symmetries (closures)– Signal – noise inductions
(closure effects)• Sense of self
– Bayesian input and output– (sense of possible and actual)
• Sense of other– Social signal detection
globalSTS
global
local
Self percept (iostream: cognition /
affect / conation)localAuditory
processing
language
Visual form
Visual motion
“Other” percept
Audiovisual social processes
EBA
affect
MT
Decision making motor planning
cerebellum
Visual input
Auditory input
Attentional / Motor output
premotor
Animate data-sets
• Perceptual orthogonality/symmetry• Objects/properties• Closure processes and mismatches• Probabilistic percepts• The “neuroeconomic” percept (“decision-
maker”
(Social) signal detection
• Form pathways and perceptual closure• Motion pathways and constructs
– Coherence– Symmetry– Minimum jerk
• Inversion effects and expert systems• Teleological processes, “mentalizing”, theory-
of-mind, and beyond
Biological motion
Marey’s chronophotography
Muybridge
Unattended
Attended
Adult results
component ms task hem mot Task * hem Task * mot Hem * mot Task * hem * mot
eP1 80-100 0.94 0.86 0.78 0.57 0.42 0.76 0.46
P1 100-120 0.99 0.17 0.15 0.86 0.52 0.04* 0.34
P1-N1 120-170 0.65 0.91 0.01* 0.67 0.5 0.01* 0.79
N1 170-190 0.14 0.07 0.55 0.04* 0.28 0.07 0.60
N1-P2 190-240 0.03* 0.36 0.001* 0.01* 0.01* 0.77 0.88
P2 240-320 0.04* 0.19 0.001* 0.22 0.02* 0.23 0.25
N2 320-400 0.64 0.31 0.02* 0.44 0.39 0.02* 0.18
Summary of results of 3-way ANOVA with independent variables of task-type (attended vs. unattended), hemisphere, and motion-type (BM vs. SM). (* indicates significant results at α = 0.05.)
The inversion effect
neurophysiology
Inversion effects - EEG
Stekelenberg and de Gelder, 2004
Inversion effects - EEG
Stekelenberg and de Gelder, 2004
Inversion
scrambled.swf
Inversion – biological motion
Thompson et al., 2005
Inversion – biological motion
Thompson et al., 2005
Inversion – biological motion
Thompson et al., 2005
Social cognition in development
Biological motion processing across childhood
Development
Hirai et al., 2009
Development
Hirai et al., 2009
Development
Hirai et al., 2009
P1
Development
Hirai et al., 2009
N1
Development
P1-N1
Hirai et al., 2009
Development
N2
Hirai et al., 2009
Development
Hirai et al., 2009
TD
TD unattended upright-scrambled
TD attended upright-scrambled
TD unattended upright vs. scrambled
TD attended upright vs. scrambled
Unattended upright vs. scrambled TD 6-9 yrs.
Unattended upright vs. scrambled TD 6-9 yrs.
6-9 yrs.
Unattended upright vs. scrambled
6-9 yrs.
9-13 yrs.
Unattended RH linearityage PO8
200-300mscorrelation
7.13 -2.00 -0.928.46^ -2.34^8.77 -3.879.79 -3.46
10.04 -5.8910.18 -5.1411.08 -5.3711.89 -6.0212.50 -6.91
^subject is ASD sibling
Are these attended effects specific to one hemisphere?
TD attendedscrambled vs. upright BM
Left
Right
mid
TD
ASD
ASD unattended(N=13)
Both tasks collapsed
Both tasks collapsed
ASD (N=7) attended
ASD (N=7) vs. ASD (N=14) attended
PO7
ASD
TD
unattended attended
Green=scrambled; red =upright BM; blue= Inverted BM
PO8
ASD
TD
unattended attended
Green=scrambled; red =upright BM; blue= Inverted BM
ASD vs. TD (N=7) attended
ASD
TD
ASD unattended upright-scrambled
ASD attendedupright-scrambled
ASD unattended upright vs. scrambled
ASD attended upright vs. scrambled
ASD Attendedupright vs. scrambled
ASD vs. TD unattended scrambled
ASD (N=14) attended upright-scrambled 180ms
However…
Unattended (N=14,14) upright-scrambled repeated measures (ordinal ages)
ASD vs. TD
TD 8-12 N=11 unattendedupright-scrambled
α=0.1
TD 8-12 N=11 unattendedupright-scrambled
α=0.01, 11 consecutive timepoints
ASD attended upright-scrambledn=11; α=0.01
ASD attended upright-scrambled
n=11; α=0.1
TD attended upright-scrambled n=11
TD attendedupright-scrambled n=11
ASD attended upright-scrambled
n=11; α=0.01
unattended (ASD-TD) X (upright-scrambled)
ASD-TD(scrambled)
ASD-TD (upright)
ASD-TD (upright)
ASD13 un
200-300 symmetric
ASD unattended 164ms
292ms (-44,-83,-13; 22,37,51)
Asd un
Right activity (53,-45,-42)
395ms
TD (N=15) unattended
Td15 un upright-sc
ASD14 att
ASD attended upright-scrambled
ASD attended upright-scrambled
ASD attended upright-scrambled
ASD vs. TD attended upright-scrambled
ASD vs. TD attended upright
ASD (N=12) vs. TD (N=10) Unattended Scrambled
ASD (n=11) vs. TD (n=10) attended scrambled
ASD vs. TD minimum jerk
6-9.5 yrs 9.5-13 yrs.
6-13 yrs.
automatic biological motion processing
closure
Sehatpour et al., 2006
Sehatpour et al., 2006
closure
Weak (central) coherence
• Local processing bias
• Could weak coherence early in development cause “mind blindness”?
Q: Could a simple, feed-forward sensory deficit explain social dysfunction?
A: No(?)
Motion and motivation
Mirror neuron system
• “Unlike inanimate objects, humans have the distinct property of being “like me” in the eyes of the observer.
• This allows us to use the same systems that process knowledge about self-performed actions, self-conceived thoughts, and self-experienced emotions to understand actions, thoughts, and emotions in others.”
Obermann and Ramachandran, 2007
What’s new with mu?
• Mu wave suppression and mirror neurons
• Implicated in ASD?– Raymaekers et al., 2009
• No difference in ASD in contrast to other studies?
Beyond mirror neurons• 1st-person (empathetic) vs 3rd-
person (systematic) processing model of neurocognition– Animacy scales– “selfness” vs. “otherness”
• Extreme male brain and higher empathy/identification threshold
– Reductionism: Selections and selectors
• Cognition of the possible• Cognition of the actual• Non-determinism