Quiz 4 Flashcards
Accommodation
change in curvature of lens depending on distance
convergence
eyes turn in when focusing on object
binocular disparity
each eye has a slightly different view of the world
stereopsis
the impression of depth arising from binocular disparity
how do accommodation and convergence help in perception of depth?
by signaling to the brain about the distance of objects
what are random dot stereograms?
images of seemingly random dots that, when viewed with focused eyes, reveal a 3D image, demonstrating how the brain perceives depth based on slight differences in each eye
(we can perceive depth from binocular disparity alone)
horoptor
imaginary surface that passes through the point of fixation
secondary depth cues
perception of size and distance are related (size-distance scaling)
describe the difference between corresponding and noncorresponding points when talking about binocular disparity
corresponding points are those on the retinas of both eyes, that when stimulated, give rise to the same visual direction, while non-corresponding points stimulate different directions
stereoscope
device used to present two slightly displaced images to the eyes
how can you use eyeheight to judge size?
the horizon intersects with an observers eyeheight
comparing the visual angles of the objects top and bottom to your eye level
how does height in the field give a cue to distance?
horizon line is generally higher than the foreground
relative size
if two objects are the same size, the one that is farther will have a smaller image size
why is motion important?
it is important for survival
it is more practical for current day (motion of vehicles, environmental ambiguities)
autokinetic effect
in completely dark room, single dot will appear to move
motion aftereffects
after staring at movement in one direction, stationary object will appear to move in opposite direction
apparent motion
we perceive motion in a sequence of static images
induced motion
when the background moves in one direction we perceive motion of the object in other direction
moon illusion
moon appears larger on the horizon than when it is high in the sky
emmert’s law
size of the retinal image is fixed - perceived size of the afterimage changes with distance
