Seeing Flashcards
what is the process of Visual accommodation in regards to the eye itself
the process of changing the curvature of the lens to keep the light entering the eye focused on the retina
where does light enter and process in the eye (3 elements)
enters thru cornea, passes thru pupil which is surrounded by iris
Nearsighted?
When the focus is in front of the retina, can see close stuff but not stuff far away
Farsighted
When the focus is behind the retina, When people can see things far away but not close
What does the Optic nerve do?
sends vast amounts of visual information, via the thalamus, to the brain
what are Rods
visual neurons that specialize in detecting black, white, and grey colours. found around the fovea. sensitive to low levels of light
what are cones
sensitive to color, specialize in detecting fine detail, 5 million or so of these in each eye, operate best in bright light. found around and in the fovea
where is the Feature Detector Neurons located, and what does it respond to
located in the visual cortex, respond to strength, angles, shapes, edges, movements of a visual stimulus
how many color variations can the human visual system detect?
7 million, but they’re all created by the three same primary colours
what does the trichromatic color theory claim in regards to cones
claims that the colour we see depends on the mix of the signals from the three types of cones
What does color blindness mean
the inability to see green and/or red colours
Opponent-process colour theory
hint: think combinations
claims we analyze sensory info not from red, blue green, but from three combos of opponent colours: red-green, black-white, yellow-blue
What is a gestalt
A meaningfully organized whole
What are depth cues?
messages from our bodies and our external environment that gives us info about space and distance
Binocular depth cues
depth cues that are created by the space between our eyes, and require coordination of both eyes
what is convergence (what is it from and what is it)
a binocular depth cue, the inward turning of our eyes that is needed to focus on objects that are closer to us
What does accommodation do
helps determine depth
monocular depth cues do what
depth cues that help us perceive depth using only one eye
beta effect
perception of motion that occurs when different images are presented next to each other in succession, like how movies and stopmotion works
Phi phenomenon
We perceive a sensation of motion caused by the appearance and disappearance of objects that are near each other, like a little loading sign on a webpage
