Autism and the Social Brain - YAI: Seeing Beyond Disability · • Social brain is the interaction...
Transcript of Autism and the Social Brain - YAI: Seeing Beyond Disability · • Social brain is the interaction...
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Autism and the Social BrainA Visual Tour
Charles Cartwright, M.D.
Director
YAI Autism Center
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“Social cognition refers to the fundamental abilities to perceive, categorize, remember, analyze, reason with, and behave toward other conspecifics”
Pelphrey and Carter, 2008
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Abbreviation Structure
AMY Amygdala
EBA Extrastriate body area
STS Superior temporal sulcus
TPJ Temporal parietal junction
FFG Fusiform gyrus
OFC Orbital frontal gyrus
mPFC Medial prefrontal cortex
IFG Inferior frontal gyrusPelphrey and Carter 2008
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Building Upon Structures and Function
Pelphrey and Carter 2008
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Neuroimaging technologies• Explosion of neuroimaging technology
– Faster, more powerful magnets – Better resolution images showing thinner slices of
brain• Visualize the brain in action • Explore relationship between brain structure, function,
and human behavior.• Help identify what changes unfold in brain disorders
like autism
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Neuroimaging in ASDs
• No reliable neuroimaging marker• Imaging not recommended as part of routine work-
up• Neuroimaging research can provide clues to brain
structure and function and to neurodevelopmental origins
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Structural Brain Imaging
• MRI and CT• Allows for examination of structure of the
brain• Identifies abnormalities in different areas of
brain• Helps understand patterns of brain
development over time
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MRI
• Magnetic Resonance Imaging• Uses magnetic fields and radio waves to produce
high-quality two- or three dimensional images of brain structures
• Large cylindrical magnet creates magnetic field around head; radio waves are sent through the magnetic field; sensors read the signals; computer constructs an image
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Axial brain image
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Sagittal brain image
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Coronal brain image
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Functional Brain Imaging• fMRI and PET• fMRI adapts MRI to measure functional
changes in brain activity• Amount of oxygen found in blood affects
its magnetic properties• fMRI detects regions with changes in
levels of blood oxygenation due to activity-related changes in blood flow
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Touch MRI
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Left hand touch
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Face processing in autism
• Recognition of faces and interpretation of facial expressions are integral part of interpersonal interactions
• Typically developing children discriminate between familiar and unfamiliar faces by a very early age
• Failure to look at faces is one of earliest symptoms of autism; may be present within first year
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Fusiform Gyrus
Gray 2010
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Schultz et al, 2000
The Fusiform Gyrus
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What is the Fusiform Gyrus?• Area of the temporal lobe• Present in both right and left hemispheres• Certain areas activated in:
– Facial recognition– Color recognition
• Communicates with amygdala• Specialized area for viewing faces- fusiform face
area• Intraoperative electrical stimulation disrupted
facial recognition (Fried et al 1982)
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fMRI experiment: face, object, pattern stimuli
Schultz et al, 2000
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Face Object
Typical Control Group
ASDs Group
Patterns of brain activation
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What happened in your fusiform face area?
• If you saw the faces the FFA responded much more strongly
• If you saw the vase the FFA was not as highly activated
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Fusiform Gyrus in Autism
• Abnormalities in the structure of the FG• Hypoactivation of fusiform face area• Indicates disruption of connectivity
– Inability to generate higher level facial perception processes
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Pierce and Redcay 2008
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Gerlotti et al. 2005
Grelotti et al. 2005
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Amygdala
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What is the amygdala?
• Located within medial temporal lobe• Sends information to and receives information
from multiple neurological structures• Involved in the fear response• Analyzes facial expressions to determine
emotional states
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Amygdala
• Emotion, arousal• Critical structure for social-emotional
functioning• Works in concert with frontal lobes,
cingulate gyrus, temporal cortex to add emotional tone
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Fusiform Gyrus-Amygdala Connections
• The viewing of emotional faces increases interaction between the two
• Amygdala acts to increase neural activity of FG to increase awareness of emotional states
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Superior Temporal Sulcus
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What is the Superior Temporal Sulcus?
• Fold located in the temporal lobe
• Visually analyzes biological motion to interpret and predict the intentions of others
• Vital for ‘detection of life’
• Essential for understanding of eye-gaze
• Responds strongly to eye and mouth movements
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Eye Gaze Research
Which part of the face is the person looking at?
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Visual Fixation Patterns
Viewer with autism – greenTypical viewer – yellow Klin et al, 2002
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Klin et al, 2002
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Nacewicz 2006
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Eye-Gaze Processing in Autism
• Individuals with ASD can detect gaze direction• However difficulty in inferring mental states
from gaze analysis
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Pelphrey et al. 2004
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Superior Temporal Sulcus in Autism
• Lack of engagement and activation with mPFC
• Does not differentiate between biological and non biological motion
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Pelphrey et al. 2003
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Processing of Emotional Expressions in Autism
• Abnormal modulation of activation from static vs. dynamic emotion in:– Amygdala– FFG– STS
• Amygdala reduced capacity to process visual information and create a sense of emotional meaning
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Pelphrey et al 2007
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Ishai et al. 2008
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Mirror Neuron Systems and the Superior Temporal Sulcus
Iacobono and Dapretto 2006
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Mirror Neurons• Located in the frontoparietal area
• Active when:– Performing goal directed actions
– Observing goal directed actions
• Regions containing MNS connected to STS
• Involved in the development of the ability to imitate
• Critically important structure in enabling individuals to experience and express empathy
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Importance of Imitation
• Learning
• Social interaction
• Understanding other’s actions and the feelings that go along with the actions
• Empathy
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Medial Prefrontal Cortex
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Medial Prefrontal Cortex
• Frontal lobe• Information from multiple subcortical and
cortical structures• Responsible for reasoning, reflection, and
emotional inferences• STS and mPFC connection
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Theory of Mind• Ability to explain and predict behavior of others by recognizing their:
– Thoughts– Feelings– Goals
• Different levels of ToM– Inferring personal mental state– Inferring other’s mental state– Analyzing socially relevant cues
• Information integrated from visual senses regarding:– Eye-gaze– Facial recognition– Emotional status of face
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Oxytocin and Autism
• Social peptide• Better known as Pitocin• The trust hormone• New role in the treatment of ASDs• Access to the CNS
– Nasal spray
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Kirsch et al 2005
fMRI study of Oxytocin’s Effect on Amygdala Response to Fear
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‘Face’ training
• Use of computer games
• Pre- and post-training fMRI
• Assess whether patterns of FG activation can be modified by training and whether changes are associated with improvements in social skills
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artist with autism, age 14
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Building Upon Structures and Function
Pelphrey and Carter 2008
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Conclusions• Social brain is the interaction and connection of
multiple neurological structures integrating information to enable social and emotional functioning
• Structures have many connections to and from other structures
• Significant differences shown in individuals with autism• Further research will further increase understanding of
the social brain
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Thank you