Transcript Sensation powerpoint

Sensation
Mrs. Craig
Vision--Parts of the Eye
 Cornea
 Iris
 Lens
 Pupil
 Retina
 Fovea
 Blind Spot
Rods & Cones
 Rods- receptor cells sensitive to violet-
purple wavelengths; good for night vision;
only sees black & white
 Cones- receptor cell for colors; works in
daylight.
 Cones are concentrated in the center of the
retina, Rods are spread around the outside.
Color Blindness
 Red-green blind - the most common, and
more in males than females.
 yellow-blue blind
 totally color blind - with only rods
functioning, must avoid bright light.
Afterimages
 Firing of unused cones after steady viewing
in order to bring cone levels into balance
Find your Blind Spot
Place two marks on a blank sheet
about 4 inches apart.
Cover your left eye and stare at the
left mark.
Move the paper toward your face
until the other mark disappears.
It’s in your blind spot!
Audition (Hearing)
 Pitch - how high or low a sound is.
 Intensity - how loud a sound is (decibels)
Parts of the Ear
 ear drum, bones, cochlea, cilia, auditory
nerve.
Cutaneous reception
 1. Physical changes
 2. Temperature changes
 3. Continuously Active/Pain - responds to
injury or poison
Olfaction (Smell)
 Cilia report detected molecules to the
olfactory bulb.
 Animals use Pheromones to communicate
by smell.
Taste
 Taste buds on tongue report to brain
 taste buds made of papillae
 Four types of taste receptors: sweet, sour,
bitter, and salt.
 Salt - needed in childhood especially.
 Bitter - to warn of poison
 Sugar - needed for energy