Lecture 5 Flashcards
response expansion
the perceived magnitude increases more quickly than the stimulus intensity
response compression
the perceived magnitude increases more slowly than stimulus intensity
Steven’s Power Law
quantifying relationship between perceived magnitude and stimulus intensity
P = KS^n
light
a form of electromagnetic radiation; energy produced by vibratons of electrically charged material
wave
an oscillation that travels through a medium by transferring energy from one particle to another without causing permanent displacement of the medium
photon
quantum of visible light or other form of electromagnetic radiation
visible light
the energy within the electromagnetic spectrum that humans can perceive
how do we make an image?
a sharp image is amde from light reflecting from one (and only one) of each point of an object
camera obscura
completely dark except for a porthole that allows in a stream of light
tiny porthole
crisper images but less light
larger porthole
blurrier image but more light
to produce a crisp image
(1) let enough light into the eye
(2) represent one and only one point on the distal stimulus
refraction
allows many light rays through, but refocuses them through one hole
retina
membrane in the back of the eye that contains photoreceptors
what is the goal of the eye?
focus a crisp image on the retina, which is sent to the brain via the optic nerve
