chapter 9 Flashcards
sensation
the act of absorbing raw energy (light waves, sound waves) through sensory organs
transduction
conversion of this energy to neural signals
perception
adding meaning or representation
selecting, organizing and interpreting these signals
transduction
conversion of this energy to neural signals
psychophysics
the just noticeable difference is the smallest amount of stimulus change we can detect
head turn preference test
when babies turn their head and act excited with new stimuli
what is webers law
just noticable difference.
law states the brighter the light, the more change in
the spotlight metaphor
we can move our attention to focus on various areas of the visual field- a span from small to large areas of visual angle
narrowing the spotlight gives maximal processing to that part of the visual feild
who introduced spotlight effect, who did he prove wrong?
posner- spotlight effect
freud-wrong-thought you saw all
attention
concentration of mental energy to process incoming information
extrasensory perception (esp)
when animals pick up on senses other than the 5 senses we have
light
electromagnetic radiation visible to our eyes
optics
study of light rays and their interactions
in a vacuum em travels in a straight line, this is described as a ___
ray
signal detection theory
perceptual judgment as combination of sensation and decision-making processes
steps of signal detection theory
stimulus event
neural transduction
cognition/processing
response
visual cortex (v1) (occipital cortex)
the occipital cortex where primary visual sensations are processed
focal distance is what determines
clear vision vs blurry vision
the occipital cortex where primary visual sensations are processed
visual cortex
where do the optic nerves cross
optic chiasm
know structure and function of eye
enter pic here
photoreceptors
light sensitive that transduce light
rods
sensitive to dim light but not color
cones
sensitive to colors but not dim light
bundle of neurons from the retina to the brain
optic nerve
blind spot
point where the optic nerve exist…no photoreceptors
tapetum lucidum
reflective cells in eyes. captures light that allows you to see in dark better
glaucoma
when eye pressure gets too high and destroys retina
whats the number one cause of blindness
diabetes
how does stereo vision allow us to detect 3d of depth
by vergence
Fovea
Area of sharpest vision in the retina
Accommodation
Changing shape of lens to help focus on objects based on distance
