Ch4

the detection of physical energy through sense organs

Conversion of stimulus to electrical signal

the brain's interpretation of raw senosry input

a stimulus is strongest when we first sense it, after that the sense declines in strength.

the lowest level of a stimulus that we can detect 50% of the time

the smallest change we can sense stimulus intensity

sometimes the stimulus is unclear so our brain makes its best guess.

the process by which we perceive stimuli consistently across varing condition (shape constancy/ color constancy)

colored area containing muscles that control the pupil

curved, transparent dome that bends the incomming light

opening in the center of the Iris that lets light in

Transparent disk that focuses light rays for near/ far distances

Membrane on the back of the eye containing recpetors

area on the retina where light is focused

Transmits visual signals to the rest of the brain

Nearsighted: light focuses too soon

farsighted: light focus too late

visual sensory receptors. located in the retina

sense bright light, concentrated in the fovea, concentraed in the peripheral

sense dim light

• carry visual information from the eye to the brain
• forms the optic nerve

mixing of pigments which in turn absorb more lights and gets darker (painting)

mixing of colored light which in turn gets brighter (light)

idea that color vision is based on three primary colors- blue, green, and red

idea that we perceive things as red or green, blue or yellow, light or dar, so these color must inhibit each other.