PSY 260 Chapter Notes - Chapter 3: Retina, Psy, Spatial Analysis
13 Sep 2018
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Akinetopsia - normal vision except for the inability to perceive motion. Diffi(cid:272)ult(cid:455) i(cid:374) follo(cid:449)i(cid:374)g (cid:272)o(cid:374)(cid:448)ersatio(cid:374) due to (cid:271)li(cid:374)d(cid:374)ess to speaker"s lip (cid:373)o(cid:448)e(cid:373)e(cid:374)t or changing facial expressions. Light enters the eye through the cornea, and the cornea and lens refract the light rays to produce a sharply focused image on the retina, the light-sensitive tissue that lines the back of the eyeball. The retina is made of 3 main layers: the rods and cons (the photoreceptors), the bipolar cells, and the ganglion cells (whose axons make up the optic nerve). The cornea and lens focus the incoming light so that a sharp image is cast onto the retina. The lens is surrounded by a band of muscle that causes the lens to bulge when the muscle tightens, creating the proper shape for focusing images cast by nearby objects. When the muscle relaxes, the lens returns to a flatter shape, allowing the proper focus for objects farther away.
