PSY 111 Chapter Notes - Chapter 4: Vitreous Body, Detection Theory, Optic Nerve
12 Oct 2016
School
Department
Course
Professor
Document Summary
Sensation is the detection of stimuli- energies from the world around us that affect us in some way. Receptors- specialized cells that convert environmental energies into signals for the nervous system. Light is part of the electromagnetic spectrum- the continuum of all frequencies of radiated energy. Receptors respond to wavelengths from 400-700 nanometers. Pupil- an adjustable opening that widens and narrows to control the amount of light entering the eye. Light passes through the vitreous humor, strikes retina (layer of visual receptors covering the back surface of the eyeball) Iris- colored structure on the surface of the eye surrounding the pupil. Cornea- rigid transparent structure on the surface of the eyeball. Lens- flexible structure that varies its thickness accommodates (adjust its focus for objects) Cones- adapted for color, daytime, and detailed vision. Dark adaptation- gradual improvement in the ability to see in dim light. Visual receptors send their impulses away from the brain.
