Object And Face Recognition Flashcards
What is a study linking to stage 4 of object and face recognition? (Compare to memory)
Engelman
View dependence
Toy car was rotation 0 degrees or 75 degrees
Was harder to identify when rotated
What are the 5 steps towards object and face recognition?
- See basic features
- Perceive organisation
- Perceive shape
- Compare to existing memory
- Decide familiarity
What difference does familiarity have on object and face recognition?
Familiarity vs unfamiliarity
Familiar objects are able to be recognised from a greater distance and poorer quality
Study by Burton - showed students CCTV of university staff. They were able to recognise the staff they were familiar with even when the quality was poor.
Was is a study looking into the importance of the third stage of object and face perception? (Perceive shape)
Rubins vase
The picture could look like either two peoples face looking towards each other or a vase.
What does RBC stand for and what is it?
Recognition by components
This is when objects are more recognisable when certain identifiable components of are visible of that object. (Example with watering can and scissors.)
What are the some of constancies within perception?
Size constancy - when two lines are shown and one appears to be longer than the other but actually they are the same
Light constancy - our visual systems can overlook shadows
Colour constancy - colour of an object stays similar even under varying conditions (two tiles that look different colours)
What is a constancy?
Our perception of an object stays the same even though the sensation of the object changes through external factors e.g. Shadows or size
Face vs object recognition what is the debate?
Some scientists and psychologists say that the shape of an object is everything but however this has been disputed.
Hole et al distorted pictures of peoples faces which made them harder to identify and also changed the pictures into negative.
The thatcher illusion - Thompson turned a picture of Margaret thatcher upside down and manipulated her eyes. The picture with manipulated eyes was harder to point out when upside down that when not.
What other factors are also important within recognising faces and objects?
Context - where the object or face is, is it in an environment that is suitable or typical?
Davenport and potter - pope on an American football pitch
Why do computers sometimes fail at recognising objects or faces?
For humans to recognise objects or faces the objects need to have semantic and perceptual similarity.
Computers don’t have good perceptual similarity and therefore aren’t
as good as humans at it.
What is Marr’s theory of perception?
His theory of vision had 3 stages; primal sketch, 21/2D and 3D.
Primal sketch - blobs edges lines curves etc
21/2D - surface of object
3D - volume of object
What is the thatcher illusion an example of?
Configural processing
What is the relevance/importance of the second stage in object and face processing?
Occlusion - not being able to see a part of an object because it is occluded (blocked) by another object in front of it. It is also knowing that a hidden piece of an object still exists.
