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Lecture 3

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PSY353 Lecture 3 - Jan 22, 2013 Perceiving and Communicating with Others  we are face specialists (better than anything eles can identify,, recognize and evaluate faces/facial expressions)  How do we do it?   How does it change developmentally?  Try to link brain development, neural network maturity and behavioural changes  beahvaiour and neural substrates in adults  development of behaviour  development of neural substrates Face perception  The face processing system  o 1) face preference o  prefer to look at faces vs/ objects  prefer attractive faces (even infants) o 2) Face categorization o  ex. male vs. female  age of person  emotion o 3) Face recognition o  is it familiar (do i know this person?)  children not very good at recognition beyond primary caregivers  prospagnosia: neurological disorder wher one cannot recognize faces  Baby Human - Face Recognition: Youtube Video  o baby human not attracted to specific features but the light and dark contrasts o within 4 wks higher brain centres develop which make baby more apt to look at facial features o @ 2 months of age vision becomes more develloped (looks blurry) o  baby able to make conections b/w sights and sounds  during lab tests experimenters assume that babies look longer at something b/c its novel or they are familiar with it or like it Face processing in adults  relational information: adults discriminate faces by looking at how facial features relate to each other in size, locatio, distance from each other  o infants cannot do this I) face Preference  newborn infants prefer face-like stimuli (prefer A. over B.)  not necessarily that they like faces, like top-heavy configuration  cannot tell difference b/w proper face and top-heavy configuration (newborns) thatcher effect/inversion effect  Margeret thatcher (PM of England)  cut out facial features and flip them differently from face itself  top upside down picture looks normal, looking at same picture flipped know its not normal  o upside down face in inverted but face features are not (in right side up pic its the opposite) 2) Face categorization  Norm-base coding  o subconsciously create a prototype of what a face should look like in your brain o  compare new faces based on prototype (familiar to prototype get encoded closer, novel gets encoded farther away)  protoype is presumably fluid o infants (3mos) categorize face different from objects o study: trained infants where women = primary caregiver, to be familiar to either male/female model pictures o  babies are comparing female face from experiment to prototype based on mother, don't have same ability with novel male pictures  effect switches when primary caregiver is male  babies can still tell a male vs. female face without hair (although hair is important for contrasts in face) o ORB study: o  babies prefer faces of their own ethnicity between 3- 6 months of age  at 3 months and before look at all different ethnicities that same o contact hypothesis - the faces you see in early development shape your
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