chapter 5 lecture Flashcards
transduction
the process by which sensory stimuli are converted to neural signals the brain can interpret
transduction in electromagnetic
light is converted from electromagnetic energy to energy in the form of action potential (neural impulses)
what is a subjective process, sensation or perception
preception
sensation
the stimulation of sense organs
involves the absorption of energy (light sound waves) by sensory organs (eyes and ears)
perception
the selection, organization and interpretation of sensory information
- involves the translation of sensory information into something meaningful
what physical property matches with the hue of a colour
wavelength/frequency
what related preception of colour matches with amplitude
brightness
what related perception matches with purity
saturation
timbre
purity of sound. A pure tone that has only one frequency and one amplitude
what sets apart sound of a piano from sound of flute
what physical property of sound relates to the perception of pitch
wavelength/ frequency
what related perception does amplitude match with
loudness
what physical property matches with timbre
purity
blind spot
the nerves that run from the retina to the brain converge at a spot this spot has no receptor cells
- any image that falls on this spot cannot be seen
- each eye has a blind spot, but you are not aware of the spot because each eye compensates for the blind spot of the other
the retina contains millions of ____ cells. they are where in the retina, what does this mean
receptor
innermost layer
means only 10% of light arriving at the cornea reaches the receptor
receptor cells are sensitive to
light or photoreceptors
do humans have more rods or cones, how many
more rods
rods= 100-125 million
cones =5 to 6.4 million
What are the two types of receptor cells. what classifies them
rods and cones
- shape classifies them
what is the fovea
tiny spot in the center of retina that contains only cones
the periphery of the retina is outnumbered by
rods
cones are responsible for
colour vision
daylight vision
visual acuity
rods are responsible for
peripheral (area right outside of the fovea) vision
night vision
how many light absorbing pigments do rods and cones have
rods - have the same
cones- three different (which any one cone has one of )
four in total
where is visual information processed
retina and brain
in the retina, where is visual information processed
in the receptive field of a ganglion cell
processes- perception of light/dark contrasts