PPVK Vision 6 Flashcards
Motion
changes in position over time
What is sufficient to create a vivid sensation of motion in perception?
Viewing sequential snapshots of a stationary object changing position
Pregled uzastopnih snimaka nepokretnog objekta koji mijenja položaj
What is the term for a perceptual experience that is indistinguishable from continuous motion despite different physical stimuli?
Metameric perceptual experience.
Apparent motion (prividno gibanje)
Osjećaj kretanja koji proizlazi iz gledanja uzastopnih statičnih slika.
Do changes in image position on the retina always result in motion perception?
No, if they are caused by movements.
Motion aftereffect (MAE)
the illusion of motion of a stationary object that occurs after prolonged exposure to a moving object
Interocular transfer
the transfer of an effect from one eye to another
MAE exhibits interocular transfer
The Reichard detector
motion sensitive neurons with motion receptive fields, manager of early V1 neurons
Correspondence problem (motion)
motion detection system which feature in frame 2 corresponds to which feature in fram 1
Aperture problem
When you see a moving object through a small opening (like a peephole), it can be hard to tell the exact direction it’s moving because you only see part of it.
What determines global motion?
motion information from several receptive fileds:
- local apertures -> local motion
Lesions in which layer of LGN impair perception of large fast, radpidly moving objects?
Magnocellular layers
Which part also plays important role in motion perception?
MT - Middle temporal layer
First-order motion
the motion of an object that is defined by changes in luminance
Second order motion
the motion of an object that is defined by changes in contrast or texture (invisible to reichard fields and fourier based mechanisms)
Our sensitivity to ___________ is considerably _______ than our ability to preceive ___________ motion.
second order, weaker, first order
Perception of second-order motion is also more sluggish and requires ______ ________ ________
greater spatial integration
Human motion visual motion perception served by three separate motion systems :
- first order motion: Sustav osjetljiv na promjene svjetlosnih uzoraka u pokretu
- second order motion: Sustav koji vidi kad se pomiče upadljiv dio slike, iako je svjetlina svuda ista
- third order motion : Sustav koji prati kretanje važnih dijelova slike, označenih na posebnoj mentalnoj karti, dok nevažne dijelove zanemaruje.
Optic array
the collection of light rays that interract with objects in the world in front of a viewer
Optic flow
promjenjivi kutni položaj točaka u perspektivnoj slici koju doživljavamo dok se krećemo kroz svijet
Time to collision
is the amount of time left before you hit something, if you keep going at the same speed.
Biological motion
the pattern of movement of all animals
Perceived speed varies on factors such as
luminance, contrast, stimulus size, eccentricy type of motion, pursuit eye movement
the leading model of speed perception relies on_____?
Bayesian framework
