High level visual processing week 3 Flashcards
Define perception
Interpreting sensations to make sense of the outside world
High level perception is the recognition of faces, objects etc.
How do we recognise objects ?
The information that is seen/the sensory input is matched with a stored representation of that object in the memory.
How do we ensure we recognise objets even when from many different viewpoints, 3 possibilities:
We can ensure we store as many representations of objects as possible.
Or use BIDERMAN (1987) object recognition theory, we recognise objects based on their parts. Parts are called geometric ions/units, or GEONS. The way geons come together in a particular order and shapes make that object.
Also MARR 1982 proposed similar idea, objects are cylindrical shapes w/ diff orientations etc. just like humans.
Which brain pathway is responsible for object recognition
The VENTRAL “what” Stream = damage to it created visual agnosia in patient DF
How is face recognition different to objects recognition
Objects = analytical Faces = Surface features critical, pigmentation and shading, the eye region also highly important.
Holistic processing of faces - the representation of parts is influenced by the presence of other parts (ex the composite illusion)
Name three primary brain regions involved in face recognition and cite study
Haxby et al 2000
In ventral stream, 3 main regions activate primarily for faces:
Occipital face area , Fusiform face area, Superior temporal sulcus
Definition of prosopagnosia , and explain the different types
Severe deficit in face recognition w/ no visual impairment or other disability. First account by BODAMER 1947
Acquired proso, = develops after brain damage like stroke or head injury.
Developmental proso = no apparent brain damage, emotion recogni intact, runs in families.
Apperceptive proso - inability to perceptually process faces
Associative proso - inability to recognise previously familiar faces
