DEHUMANIZING THE LOWEST OF THE LOW: NEUROIMAGING RESPONSES TO EXTREME OUT-GROUPS Lasana T. Harris and Susan T. Fiske Princeton University, 2006
Jan 11, 2016
DEHUMANIZING THE LOWEST OF THE LOW:NEUROIMAGING RESPONSES TO EXTREME OUT-GROUPS
Lasana T. Harris and Susan T. Fiske
Princeton University, 2006
Introduction - Prejudice
Allport (1954), father of prejudice research Antipathy based on a perceived social
category
Not as “black and white” as like/dislike – different types of prejudice
Extreme forms of prejudice may deny their targets full humanity
Stereotype Content Model (SCM) Predicts differentiated prejudices
1. Friend-foe judgment (warmth)2. Capability judgment (competence)
Societal groups: intend either help or harm, are either
capable or incapable of enacting these intentions
Stereotype Content Model (SCM) 4 combinations of the dimensions 4 emotions
towards social groups1.Pride2.Envy3.Pity4.Disgust
Not all groups provoke animosity
Competent + warm = middle-class, pride and admiration
Competent + not warm = rich people, envy and jealousy
Warm + incompetent = elderly people, pity and sympathy
Stereotype Content Model (SCM)Low warmth + low competence = most
extreme out-groups, disgust and contempt
Based on perceived moral violations and subsequent negative outcomes these groups allegedly cause themselves
Dislike and disrespect
Extreme discrimination: Excluding out-groups from full humanity
The Medial Prefrontal Cortex (mPFC)
fMRI data: mPFC differentially activated in social
compared to nonsocial cognition especially when required to make social
judgments about people
“Social groups falling into the low-warmth/low-competence quadrant of the SCM might not significantly activate the mPFC”
Participants
22 Princeton University undergraduates, for course credit
Right-handed
Reported no abnormal neurological condition, head trauma, brain lesions
Normal or corrected vision
Mean age across the two studies: 19.5 years
12 participants were women
6 were ethnic minorities
Method
Participants shown images of Different social groups (Study 1, 10 subjects) Different objects (Study 2, 12 subjects)
Assessed each picture which of the four SCM emotions best described
how the image made them feel
Once inside the scanner, once outside
Blood-oxygen-level-dependent (BOLD) signal changes recorded
The Images
Study 1 48 colour photographs of eight different social groups
Study 2 Eight images of objects, each shown three times each
Each study had six filler neutral images
Each picture depicted one of the four SCM quadrants 254 undergraduate students had pretested 80 images:
“How much of the following emotions does this picture make you feel?” on a 5-point scale
ANOVA, t-tests – only pictures with reliable effects selected
Results – Study 1
Support for the dehumanization hypothesis
Participants identified the predicted emotions for the pictures of the social groups
Outside scanner: low-low rated higher on disgust
Results – Study 1
Significant mPFC activity for pride, envy, pity
No activity above significant threshold for disgust
Results – Study 1
Did find that there was activation in the left insula and the right amygdala
Insula – disgust
Amygdala - fear
Results – Study 2
No mPFC activity above baseline for disgust-inducing objects
Small yet significant mPFC activation for objects inducing envy
Pride, envy, pity: social emotions felt during presence (implied or actual) of a person Participants reported envy towards an object
only if the presence of a person was implied (stack of money)
Discussion
Used to investigate and reduce “hate crimes, prisoner abuse”
Clear to read
Focus on previous research and the introduction
Almost no discussion
Specific examples of extreme out-groups
What eight social groups shown – which ones elicited disgust
Significance of testing inside and outside the scanner
Discussion
Rating of photos to standardize Done by Princeton students as well: more likely to have similar
opinions as their peers – no random sampling for study or standardization
Objects induced people’s emotions when they weren’t meant to
In study 2, the pictures were repeated three times, to be consistent: have 48 pictures as well
Amygdala and insula mentioned only in passing – study that further to see if combined that is what they imply or if its only when they are separate Aspects that make people feel this way – living
conditions, inability to relate What manipulations/changes could make people not feel
this way