Behavioral Sciences Review Flashcards
When things are far away…
Muscles of eyes relax
When things are closer…
Muscles of eyes contract
Motion Parallax
“relative motion”
Things far away are slower, things that are closer are faster
What hearing adaptation occurs when there is a louder noise?
Inner ear muscle contracts, dampening vibrations in the inner ear. This protects the eardrum
When does down-regulation of sight occur?
When it’s bright out, your pupils constrict letting less light enter the back of the eye.
rods and cones become desensitized to light
When does up-regulation of sight occur?
When it’s dark out, your pupils dilate letting more light enter the back of the eye.
rods and cones become over-sensitized to light
Absolute threshold of sensation
the minimum intensity of stimulus needed to detect a particular stimulus 50% of the time
Where do balance and spatial orientation come from?
inner ear and limbs
How do we detect what direction our head is moving in?
The semicircular canal of the ear is filled with endolymph, a fluid that shifts based on direction
Signal Detection Theory
How we make decisions under conditions of uncertainty; determining between “noise” and important stimuli
Pragnanz
reality organized such that it is reduced to simplest form possible
Law of Common Fate
If there are an array of dots and half the dots are moving upward while the other half are moving downward, we would perceive the upward moving dots and the downward moving dots as two distinct units.
Conjunctiva
thin layer of cells that lines the inside of your eyelids from the eye
Cornea
transparent thick sheet of fibrous tissue, anterior 1/6th; starts to bends light,
first part of eye that light hits
Anterior Chamber
space filled with aqueous humour, which provides pressure to maintain shape of eyeball; allows nutrients and minerals to supply cells of cornea/iris
Pupil
the opening in the middle of the iris. The size of the pupil can get bigger/smaller based on the iris relaxing/contracting respectively. The pupil modulates the amount of light able to enter the eyeball.
Lens
bends the light so it goes to back of eyeball – focuses light specifically on the fovea of the retina. Adjust how much it bends the light by changing its shape, using the suspensory ligaments
Retina
inside, back area filled with photoreceptors, where the ray of light is converted from a physical waveform to a electrochemical impulse that the brain can interpret
Macula
special part of retina rich in cones, but there are also rods
Fovea
special part of macula. Completely covered in cones, no rods
What wavelength is violet light?
400nm
What wavelength is red light?
700nm
Phototransduction Cascade
Light hits rods (turns rods off) –> bipolar cells (turn on) –> retinal ganglion cells (turn on) –> optic nerve –> brain
When does photopic vision occur?
at levels of high light