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Sensation vision.docx

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Steve Joordens

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 example, squint). 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 neural signs. Visual Transduc
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