Shared Flashcard Set

Details

Visual Perception System
Chapter 5 of the Psychology VCE 3/4 textbook. Flash cards based on the visual perception system.
20
Psychology
12th Grade
05/08/2009

Additional Psychology Flashcards

 


 

Cards

Term
Photoreceptors
Definition
Specialised neurons that detect and respond to light by converting it into neural impulses that can be processed by the brain.

Term
Structure of the eye
Definition
[image]
Term
Visible light spectrum
Definition
Wavelengths that vary between 380 nanometers to 760 nanometers and can be received by the human eye.
Term
Cones
Definition
Photoreceptors that are important for daylight vision, visual acuity and colour vision. Cones do not operate well in dim light.
Term
Rods
Definition
Photoreceptors that are important for night vision because they are more sensitive to dim light than cones. Important for peripheral vision.
Term
Fovea
Definition
A small area located in the center of the retina. 0.3 mm in diameter and contains a high concentration of cones. Visual acuity is highest in this area.
Term
Blind Spot
Definition
The area in the eye where the optic nerve leaves the retina. Contains no rods or cones.
Term
Absolute threshold
Definition
The minimum amount of light energy that is necessary in order for a visual stimulus to be perceived 50% of the time.
Term
Differential threshold or (just noticeable difference)
Definition
The smallest perceptible difference that can be detected between two visual stimuli by the eye 50% of the time.
Term
Reception
Definition
The process by which the structures of the eye capture an image of a visual stimulus and focus it on the photoreceptors contained in the retina.
Term
Transduction
Definition
The process by which photoreceptors in the retina convert electromagnetic energy into electrochemical energy. This involves the use of photopigments.
Term
Photopigments
Definition
Chemicals that are sensitive to light and that are bleached into other chemicals by the light.
Term
Transmission
Definition
The process of sending and receiving visual information in the form of electrochemical energy from neuron to neuron along neural pathways to the visual cortex in the brain.
Term
Transmission process
Definition
Photoreceptors activated by light, then they 'ignite' bipolar cells, which in turn trigger the firing of the ganglion cells. The ganglion cells converge to make the optic nerve which transmits neural impulses from the retina to the primary visual cortex.
Term
Selection
Definition
Process involving differentiating between various features that make up a visual stimulus. Occurs in almost all places of the visual perception system including cones, rods and within the visual cortex.
Term
Feature detectors
Definition
Specialised neurons found in the visual cortex that detect specific 'features' of a visual stimulus. Each type may detect only certain features of a certain stimulus.
Term
Receptive field
Definition
A small area of visual information received by a cluster of photoreceptors. Feature detectors make 'selections' from these small sections of retinal image.
Term
Organisation
Definition
The reassembling of features of visual information in an appropriate and meaningful way.
Term
Interpretation
Definition
The process of assigning meaning to sensory information detected by photoreceptors and transmitted to the brain.
Term
Sequence of visual perception
Definition
Reception, transduction, transmission, selection, organisation, interpretation
Supporting users have an ad free experience!