Chapter 3- The Visual Perception System Flashcards
Reception
Photoreceptors in the retina detect and receive light
Transduction
The retina contains millions of nerve cells that detect and respond to light. These are photoreceptors
They respond by changing th electromagnetic energy (light) to electrochemical energy
Transmission
Sent to the brain via optic nerve
Organisation
Assembling or arranging features of a visual image in a meaningful way
Interpretation
Interpreting or assigning to the visual image as a whole
Visual sensation
Our sense organs and receptors detect and respond to sensory information that stimulates them
Visual perception
By which we give meaning to sensory information, resulting in our personal interpretation of that information
What is the 5 sequential stages of Visual Perception
Reception Transduction Transmission Organisation Interpretation
Visual perception system
Eye Nervous system Optic nerve Brain Visual cortex
Depth cues
Sources of information for our environment or from within our body that helps us:
Perceive how far away objects are
I’m receive depth
Binocular depth cue
Use of both eyes
Convergence (cross eyed)
Retinal disparity ( close one eye and then the other eye)
Monocular depth cue
One eye.
Accomodation -the automatic adjustment of the lens
Fat=close thin=far
Pictorial
Pictorial cues
Linear perspective Interposition Texture gradient Relative size Height in visual field
Linear perspective
Is the convergence of two parallel lines as they record into the distance
Interposition
Partially blocking an object. It is perceived as being further away when it is being blocked
Texture gradient
The texture of an object as the gradual reduction of detail recedes back into the distance
Relative size
To perceive the object as being closer because the object is bigger. And vide versa. To perceive that an object is further away because the object is smaller
Height in visual field
The tendency to perceive the object as being further away because it is closer to the horizon. And vice versa. To perceive the object as being closer because it is further away from the horizon
Visual illusion
Misinterpretation of real sensory information.
The muller lyre illusion
It is the illusion is two lines. They’re equal but one of perceived as being longer (feathered)
Arrow tailed
Size constancy
Objects actual size remains the same
The image casts on the retina changes
Shape constancy
An object maintains its shape
Changes in the shape of the imagine on the retina
Brightness constancy
Maintaining the level of brightness into relation of its surroundings
Changes from the light that is reflected and casts into the retina
Ambiguous/ irreversible stimuli
Visual stimuli that enables figure ground to be perceived as ‘legitimate’ alternative
