Sensory Adaptations and Response to stimuli

Varieties of Stimuli and their Receptors

Sense organs carry messages about the environment to the central

nervous system.

The eyes, ears, nose, tongue, and skin are examples of sense organs.

The sense organs gather information (light, sound, heat, and pressure) from the environment.

The environment is everything outside the body.

The sense organs gather information from outside the body, then send the messages to the brain.

Vision is your ability to see.

Vision involves the eye and the brain.

http://www.cis.rit.edu/mcsl/faq/eye.jpg

PhotoreceptionPhotoreceptors detect “photo” stimuli and are located on the retina. Two light sensitive cells:–Rods• light intensity and motion sensitive

–Cones• color sensitive• Many are present on the fovea centralis

The blind spot for the eye is cause by the optic nerve.

Myopia (Near-Sightedness)

People with near-sightedness cannot see clearly at distance. Correction via concave lenses.

Hyperopia (Farsightedness)People with far-sightedness cannot see clearly up close. Correction with convex lenses.

Astigmatism – an uneven curvature of the eyeball