A - Face Recognition Flashcards
What is face recognition?
understanding and interpretation of faces
it is a form of pattern recognition
Where have theories of face recognition come from?
adult face perception studies
studies of people with impairments in face perception
Why study faces?
faces are central to the human world
it is thought that face perception is different to object perception
central for social interaction, media, imagination etc.
Jeffrey and Rhodes
“faces convey a wealth of information”
What do faces show?
Jeffrey and Rhodes - proportions and expressions are important in identifying origin, emotional tendencies, health and some social information
Little and Perrett, 2007 - can access personality attributions i.e. introvert or extrovert - although this appears easier in women than men
Little et al., 2013 - accuracy in discrimination of self-reported co-operators using static facial information
Specialised mechanisms
these allow different parts of the face to be identified separately and then be processed as whole too
Thompson, 1980
Yin, 1969
Thompson, 1980
the Thatcher illusion shows that each feature of the face is analysed independently and coded relative to gravity - special mechanisms within the brain allow this to happen
looking at different features looks okay but specialised mechanisms quickly realised when upright that it is wrong
Yin, 1969
when faces are upright they are processed by special mechanisms in the right hemisphere
faces presented upside down do not stimulate this mechanism so are treated like objects
highlights different processes for object perception to face perception
Brain asymmetry
left hemisphere processes info from and controls right side of body
right hemisphere processes info from and controls left side of body
Face expression
more prevalent on the left side of the face (80%)
explanation = emotional/motor control bias to right hemisphere
Prosopagnosia
helpful in understanding how normal face perception may work
Bodamer, 1947 - brain damage can produce problems in face recognition, even one’s own reflection
Farah, 1990 - 94% of prosopagnosia patients have experienced damage to the right hemisphere of the brain
Recognition
humans are really good at recognising faces even with different angles, lighting etc.
but humans are really poor at recognising unfamiliar faces
computer analysis systems are even poorer at face recognition - Hancock, Bruce and Burton, 2000
EWT is not reliable because of this poor recognition of unfamiliar faces
Internal and external features
you describe people you don’t know well in terms of external features - i.e. glasses, hair colour
you describe people you do know well in terms of internal features - i.e. personality
Information Processing Models - Bruce and Young - description
1986 - model of face processing
series of stages each accessed serially
face is seen, the structural encoding begins
view-centred descriptions - expression analysis, facial speech analysis and directed visual processing - all refine information given from structural encoding
expression-independent descriptions assess FRUs, PINs and name generation
all assessed in cognitive system where information is stored
Bruce and Young, 1986 further description
the two paths
1 - recognition of faces - has a feature-by-feature analysis - this creates a structural model of a face which can be compared to faces stored in memory - explains why faces of known people can still be recognised at novel angles, lighting etc.
2 - recognition of expression - looks at simple physical aspects of the face i.e. age, gender, facial speech