P/S Flashcards
(677 cards)
Binocular cues
Retinal disparity
Convergence ( far away - eyes relaxed; close - eyes contract)
Monocular cues
relative size relative height interposition shading and contour motion parallax ( far away- slower; close - faster)
Visual Constancy
our perception of object doens’t change even if it looks different on retina
size constancy
shape constancy
color constancy
Inner ear muscle adjustment
loud noise - contract
Sight Adaptation
light adaptation - pupils constrict, rods and cones become desensitize
dark adaptation - pupils dilate, rods and cones start synthesizing light sensitive molecules
Just noticeable difference
threshold at which you’re able to notice a change in any sensation ; smallest difference that can be detected 50% of the time
Absolute threshold of sensation
the minimum intensity of stimulus needed to detect a particular stimulus 50% of the time
Absolute threshold influncers
Psychological states: expectations experience motivation alterntess
Subliminal stimuli
stimuli below the absolute threshold
Semicircular canals- filled with
filled with endolymph
Semicircular canals detect
Rotational acceleration - what direction our head is moving in and the strength of rotation
-contribute to dizziness and vertigo cause endolymph doesn’t stop spinning when we do
Otolichic organs
Utricle and Saccule; Ca2+ crystals attached to hair cells
Otolithic organs detect
linear acceleration and head positioning
Signal Detection Theory Purpose
looks at how we make decisions under conditions of uncertainty ; “discerning between important stimuli and unimportant “noise”
Origins: sonar
Signal Detection Theory; d’
d’ is the strength of a signal
- hits > misses for strong signal
- misses > hits for weak signals
Signal Detection Theory; c
c is the strategy used
- 2 strategies: Conservative and Liberal
- Conservative - always say no unless 100% sure signal’s present - get misses
- Liberal - always say yes unless 100% sure signal’s absent - get false alarms
Signal Detection Theory; Signal Distribution Graph
2 lines are the noise and the signal
-d’ - the difference between the two
Ideal Signal Detection Strategy
c = 0
- minimizes misses and false alarms
Conservative signal detection strategy
c>1
Liberal signal detection strategy
c <1
Bottom up processing
stimulus influences our perception; Data driven; start with no preconceived ideas
Top down processing
background knowledge influences perception; Theory driven ; perception influenced by our expectation
Gestalt Similarity
Items similar to one another are groped together
Gestalt Pragnanz
reality is reduced to simplest form possible (olympic rings)