cognitive psych

bottom up processing

details first. “data driven” ex) searching for something (waldo)

top down processing

sees big picture. “concept driven”. previous knowledge and expectations

law of simplicity

people perceive/interpret images in as little shapes as possible

law of similarity

similar things are grouped together

law of good continuation

lines follow smoothest path. ex) un doing rope knot

law of proximity

objects near each other are grouped together

law of common fate

things moving together are grouped together

law of familiarity

things forming familiar shapes/ patterns are grouped together

law of closure

ignore gaps and fill them in

size constancy

we perceive objects as the same size even from different distances

ponzo illusion

ames room. the eye can only see from a limited angle and whole background is changed without them knowing so the image is perceived as an unexplainable illusion

muller lyer illusion

2 lines the same length appear different lengths. depends on the angle of the arrow at the end of them.

physical regularities

brain uses familiar patterns to judge distance and depth

semantic regularities

certain expectations for what we see. ie. someone at desk supposed to see books

perceptual disorders - what causes them

brain lesions - can be temporary - not the same for everyone

contralateral processing

brain processes info from the opposite side

damage to the brain - v1 visual cortex, occipital lobe

blindsight

damage to the brain - parietal lobe

unilateral neglect

damage to the brain - temporal lobe

visual agnosia

unilateral neglect

dont pay attention to other side of their body. ie. left side missing = right side damage

types of agnosia

appreceptive agnosia. associative agnosia. prosopagnosia

symptoms of appreceptive agnosia

cant copy or match objects. cant form patterns

associative agnosia

failure of recognition. can copy object but not identify it

prosopagnosia

face blindness. rely on non facial info to identify