PSYA01 Oct. 14
Limits of Sensation
Humans do not sense all there is to sense:
Bats have echolocation
Sharks can detect minute electrical currents
Rattlesnakes can sense low frequency vibrations
Dogs can smell cancer
Humans’ vision is good because we are not a physically strong predator.
Vision = transducing light into perception
Iris - The colored part of your eye … it is actually a
muscle that controls the size of the pupil.
Pupil - The black part in the middle of the eye … the
opening that allows light into the eyeball … lights out!
Sclera - The white part of the eye … a tough membrane
that serves as protection
Cornea - The fluid filled outer coating of the eye …
provides moisture and nutrients
Lens – Focuses the incoming light onto the retina. This
lens is flexible and slight alterations in it can alter the
focus of it, a process called accommodation (as an
Aqueous Humor - This fluid nourishes the front of the eye PSYA01 Oct. 14
Vitreous Humor - This fluid nourishes and supports the inner part of the eye
Retina – The surface that the image lands on. The inner coating is the retina is the part
that transmits the light signal (focused or not) into a neural signal.
Transduction: sensory neurons translate the physical properties of the outside world into