Lecture 3 Face Perception Flashcards
Evolutionary reasons we develop ability to recognise faces
Have specific brain area thought to process primarily faces (FFA)
Innate template of the human face means we are predisposed to recognise and interpret
Environmental reasons we develop an ability to recognise faces
Exposure to faces from birth, specifically human, allows us to distinguish
Describe fantz 1963 infant face preference
Presented infants with 3 faces where features arranged either naturally, scrambled or a control - matched for contrast
measure fixation time on stimuli as an indicator of preference
4d/o prefer structured natural face over both scrambled and control
+ compare with complex patterns of bullseye, b+w text, face and pattern with similar facial structure
- look long at patterns but longer for face
Problem with face preference study in infants (fantz 1963)
May just be recognising patterns not faces
A too complex to and b too simple
Describe Maura and Barrera 1981 face preference in infants
Matched stimuli for symmetry and contour - tested after habituation
Faces arranged naturally symmetrical, scrambled symmetrical or assymetric scrambled
Results of Maura and Barrera 1981
1 month - infants show now discrimination between stimuli
2 month - discriminate all and show preference for natural symmetric > others
role of experience?
Describe Johnson and Morton 1991 face preference via infant tracking
Slowly move stimulus across infants line of sight
1 month Track face like stimuli further than scrambled or blank
3-5 month no longer discriminate - track to same extent across stimuli
What do face preference studies show
Preference to static naturally arranged faces by 2months
Preference to moving naturally arranged faces from birth
Describe Johnson and Morton two process theory ‘CONSPEC AND CONLERN’
paradox in infancy CONSPEC Mediates tracking 0-1 month Innate template for directing attention to faces
CONLERN
Mediated static face recognition via learning
1+ months
CONSPEC theorised to ‘‘train up” CONLERN by regulatin approach behaviour/attention to facial sitmuli
Describe CONSPEC
Infant has innate info on structure of faces (not specific to humans) in subcortical visuomotor system
Mental architecture - contain relative structural architecture about location of elements
Not species/genus specific - only need to identify from other stimuli
Describe CONLERN
CONSPEC trains up CONLERN
Direction to conspecifics of face allows learning of visual characteristics
Build representations for stimuli that we encounter (superior processing of this)
perception in cortex
Describe Pascalis et al - face processing over time
6-10m infants ability to discriminate between native speech sounds increases while decreases for foreign sounds
Looking paradigm - 6+9months familiarised to human and monkey faces
Time spent looking at novel human or monkey faces compared to familiar
Results of Pascalis et al
Adults not good at recognising differences between old and new monkey faces but good with humans
6m can discriminate equally well between monkey and human faces - recognise new stimuli regardless of previous exposure
9m discriminate as adults
Describe sangrioli and deschonen 2004 race discrimination and expertise study
tested face recognition in 3-month-old Caucasian infants by conducting two experiments using Caucasian and Asiatic faces and a visual pair-comparison task
Define the other race effect
Inability to distinguish between other races due to limited exposure