What is The Visual Perception System, Explain Related Terms Flashcards

Consists of the complete network of physical structures involved in vision

Sensory perspective (Physiological structures and processes) - the same for everybody
Psychological Perspective (Cognitive processes) - differs because of past experiences, context e.g.

Specialised neurons that detect and respond to light by converting it into neural impulses that can be read by the brain
RODS & CONES

A ring of muscle that expands or contracts to change the size of the pupil and to regulate the amount of light entering the eye.

Con-vexed shape covering that protects the eye and helps focus light rays onto the retina.

LIGHT -
travels in waves that vary in LENGTH (frequency) and HEIGHT (amplitude)

The colour of the light.

The intensity of the light.

380 nanometres (violet light) to 760 nanometres (red light)

Made up of layers of neural tissue that line up the very back layer of the inner surface of the eye.
-Processes images
-transducers electromagnetic energy
-Transmits neural messages to the visual cortex of the brain

Specialised photoreceptors important for daylight vision, visual acuity, and colour vision

centrally located

Thus the area of most finely focused vision on the retina is the FOVEA which contains only cones

Specialised photoreceptors important for night vision, important for peripheral vision because rods are distributed in large numbers in the outer retina, while cones tend to be centrally located

To slightly look above/below or to the side of the object. This will focus the image on the periphery of the retina where there are most rods, providing better reception of the image.

Section of the retina containing no cones or rods and where the optic nerves leaves the retina.

The minimum amount of energy necessary before a stimulus is detected 50% of the time.