Psychology 2220A/B Chapter 6: Chapter 6 - the visual system
8 Mar 2017
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Document Summary
Light enters the eye and reaches the retina: no species can see in the dark, some capable with little light. Light can be thought of as: particles of energy (photons, waves of electromagnetic radiation, humans see light between 380-760 nm, wavelength: perception of colour. Light enters eye through the pupil size changes in response to changes in illumination: sensitivity: ability to see when light is dim, acuity: ability to see details. Lens: focuses light on the retina: ciliary muscles alter the shape of the lens, accommodation: process of adjusting the lens to bring images into focus. The retina and translation of light into neural signals: the reti(cid:374)a is (cid:862)i(cid:374)side-out(cid:863) light passes through several cell layers before reaching its receptors, vertical pathway: receptors bipolar cells retinal ganglion cells. Lights of the same intensity but different wavelengths may not look equally bright: spectral sensitivity curve shows relationship between wavelength and brightness, different curves for photopic and scotopic vision.
