social neuroscience (azim) - social neuroscience iii
TRANSCRIPT
Social Neuroscience Iii
psy400
Topics
• What is social neuroscience? (15)• Neuroimaging and TMS: Tools of SN
(35)
What is Social Neuroscience (SN)?
Physics biology neuroscience
Cognitivepsychology
Social psychology
math
sociologyeconomicsanthropology
humanities
ecosystems
chemistry
What is Social Neuroscience (SN)?
• SN: An interdisciplinary field that uses methodologies from both the neuro and social sciences to better understand the biological mechanism that underlie social processes and behaviour
• Holds that this multi-level analysis can enlighten both social psychology and neuroscience
• SN is a new field, – Partly because the tools did not exist to
appropriately study SN– Partly because social psychology is
‘messier’ than, say, cognitive. Therefore many neuroscientists ignored it, in order to simplify a dauntingly complex brain.
What is Social Neuroscience (SN)?
EEG(Electroencephelagram)
• How it works: Electrodes placed on the scalp record voltage differences between different parts of the brain
• Pros: – High temporal resolution, – Measures neuronal activity directly (via
electrical output), – Relatively easy to use.
• Cons: – Limited to surface (cortical) activity– Limited spatial resolution/anatomical
specificity
Pet(Positron emission tomography)
• How it works: A scanning device reads the positron emissions that are released as a previously injected sugar decays. Thus, it can assess the blood flow, oxygen and glucose consumption in different parts of the brain.
• Pros: – Unlike EEG, offers 3D resolution– Can measure several metabolic indicators– Tracers can reveal neurotransmitter
receptors/transporters
• Cons:– Requires radioactive injections – Radioactive half life means only short tasks
can be measured– Blood flow, oxygen and glucose consumption
are all indirect correlates of brain activity
MRI(magnetic resonance imaging)
• How it works: Uses magnetic fields and radio waves to produce high quality images by manipulating the spin of hydrogen protons
• Pros:– No radioactive tracers needed– High resolution imaging– Can register water content,
inflammation and bleeding
• Cons:– Can only register structure, and not
function
fMRI(functional magnetic resonance imaging)
• How it works: Adapts MRI to register the magnetic properties of oxygenated and deoxygenated hemoglobin, allowing real-time blood flow to be imaged
• Pros:– Can see activation in addition to high res
brain structures– Scanners can be fitted to present stimuli– Higher spatial and temporal resolution than
PET
• Cons:– Cannot trace neurotransmission like
PET– Blood flow is, again, only an indirect
correlate of brain activity
TMs(transcranial magnetic stimulation)
• How it works: Targeted magnetic pulses temporarily excite sugar-cube sized groups of neurons, allowing increases or decreases in neuronal excitability
• Pros:– Can manipulate activation rather than just
image it, allowing causality to be inferred– Temporary with no lasting damage
• Cons:– Researchers still unclear on how it works,
exactly 1cm3
Beyond“It happens in the brain!”
• Only a deeply ingrained dualism makes people amazed when behaviours are tied to brain regions: “Wow, that happens in the brain?!”-ism.
• But of course it does. SCN goes beyond this, requiring the neural correlates (or causes) of social behaviour do edify it, rather than merely locate it.
Other tools
• Animal Models– From Aplysia to Rattus and Hominoidea
• Neuro-endocrinology– The roles of, e.g.
• Androgens and estrogens• Corticosteroids• Oxytocin and vasopressin
• Clinical patients
Social Neuroscience Ii
psy400
Topics
• Key Studies in SN– Stereotyping (35)– Social Rejection (15)
Some Social areas under sn study
• Stereotyping• Social Rejection• Social Emotions• Attitudes and Attitude Change
stereotyping
• What can social neuroscience tell us about stereotyping that we don’t already know?– How does stereotyping arise in the
brain? – How automatic is it?– How difficult is it to prevent?
stereotyping
• Hart et al. (2000). Differential response in the human amygdala to racial outgroup vs. ingroup face stimuli. Neuroreport, 11, 2351-2355– Used fMRI to compare amygdalic activation when
Black and White subjects were presented with unfamiliar Black and White faces.
– In first block, amygdala activation found for both race congruent (ingroup) and race incongruent faces (outgroup
– But in second block, activation had habituated for ingroup faces, but not for outgroup faces.
stereotyping
• Hart et al. (2000). Differential response in the human amygdala to racial outgroup vs. ingroup face stimuli. Neuroreport, 11, 2351-2355
stereotyping
• Phelps et al. (2000). Performance on indirect measures of race evaluation predicts amygdala activation. Journal of Cognitive Neuroscience, 12, 729-738. - Found positive correlation between amygdala
activation and Implicit Associations Task scores of anti-Black prejudice, but not with self-report measures of anti-Black prejudice
- Familiar and high regarded black faces, like Bill Cosby and Will Smith, however, showed no more IAT prejudice or amygdala activation than ingroup White faces.
•Discussion:– What are the implications of Hart et
al, 2000? - Discussion question: How does
Phelps et al. jive with Hart et al.? - Can unfamiliarity and threat be
parsed as explanations? If so, how?
stereotyping
stereotyping
• Cunningham et al. (2004). Separable Neural Components in the Processing of Black and White Faces. Psychological Science, 15, 806-813.– Used fMRI to measure amygdala and prefrontal
activation while presenting Black or White faces to White participants for either 30msec (subliminal) or 525msec (supraliminal)
– For subliminally presented faces, found greater amygdala activation Black than White
– For supraliminally presented faces, found greater PFC activation for Black than White
stereotyping
• For 30msec, subliminal condition:
Amygdala activation is associated with threat, vigilance, emotional arousal and ambiguity
stereotyping
• For 525msec, supraliminal condition:
The prefrontal cortex and anterior cingulate are associated with inhibition, conflict and control.
•Discussion Questions:– What does Cunningham et al. suggest
about the automaticity of racial prejudice?
– Why do you think there was PFC and ACC activation for Black faces presented supraliminally?
– What implications does the difference between the sub and supraliminal presentations have for research on racism?
stereotyping
social rejection
• Eisenberger and Lieberman (2004) Why rejection hurts: a common neural alarm system for physical and social pain. TICS, 8, 294–300
- Found an overlap between the neural regions activated during physical experiences of pain, as well as those involved is ‘social pain’ or rejection
social rejection
• Eisenberger and Lieberman (2004) – Suggest that the ACC plays a key role in
a “neural alarm system”
social rejection
• Eisenberger et al. (2006) An experimental study of shared sensitivity to physical pain and social rejection. Pain, 126, 132-138– Demonstrate that those with greater baseline
sensitivity (trait) to pain also self-report more social distress in social rejection situations
– Greater social distress is also associated with greater pain unpleasantness (state) administered experimentally
social rejection
• Eisenberger and Lieberman (2004) and Eisenberger, et al. (2006)– Classic example of how social
neuroscience studies can enlighten our understanding of both social psychology and neuroscience
– It can also shed light on the evolutionary origins of neural and cognitive brain mechanisms. DISCUSSION: How?
Social Neuroscience Iii
psy400
Topics
• Key studies in SN II– Empathy (20)– Attitude change (15)
• Central Questions and Future Directions – Towards an integrated understanding of how human behaviour happens (15)
empathy
• Singer et al. (2004). Empathy for pain involves the affective but not sensory components of pain. Science, 303, 1157-1162– Used fMRI to observe brain activation when
pain was administered to a subject, or to the subject’s loved one, who was seated in the same room
– Empathizing with an other’s pain activates the regions associated with the affective, but not sensorimotor areas of pain
empathy
• Singer et al. (2004). Empathy for pain involves the affective but not sensory components of pain. Science, 303, 1157-1162
Green areas show activation in the ‘self’ condition
Red areas show activation in the ‘other’ condition
empathy
• Singer et al. (2006). Empathic neural responses are modulated by the perceived fairness of others. Nature, 439, 466-9.– Male and female subjects watched
confederates play an economic game where one confederate played fairly and the other played unfairly
– Subsequently, brain activation was monitored in the watching subjects while the game confederates were exposed to pain
empathy
• Singer et al. (2006). Empathic neural responses are modulated by the perceived fairness of others. Nature, 439, 466-9.– Both sexes responded towards the fair players
with the affective pain area activation associated with empathic pain
– For the unfair player, however, males showed marked decreases in this empathic response and, instead showed increased activation in areas of the nucleus accumbens typically associated with reward – suggesting a punishment ‘thrill’
empathy
• Singer et al. (2006). Empathic neural responses are modulated by the perceived fairness of others. Nature, 439, 466-9.
females
males
Attitude change
• Lieberman et al. (2001). Do amnesics exhibit cognitive dissonance reduction? The role of explicit memory and attention in attitude change. Psychological Science, 12, 135-140. – Sought to see if attitude change always requires
consciousness– Exposed anterograde amnesic patients to the free
choice paradigm. The patients were given two pictures and told to choose the one they preferred. Over time, they grew to like the preferred picture more, and dislike the other picture more, in comparison with other pictures, despite not having conscious recollection over making the initial decision that prompted the attitude change.