Visual Sensory Information PDF

Visual Sensory Information • • • • • • • Actineack of eye • Transmission is the electrical activation of one neuron by another neuron. Perception is conscious sensory experience of neural processing. Processing is the neural transformation of multiple neural signals into a perception. Transductio...

Visual Sensory Information • • • • • • • Actineack of eye • Transmission is the electrical activation of one neuron by another neuron. Perception is conscious sensory experience of neural processing. Processing is the neural transformation of multiple neural signals into a perception. Transduction occurs whenever energy is transformed from one form to another; in this case, light energy is transformed to electrical energy by rods and cones. Sensation requires a physical stimulus to be converted into a neural impulse. In the case of the eye, light is being converted to a neural impulse by a photoreceptor. What is light? o Light is an electromagnetic wave. o Electromagnetic (EM) spectrum contains everything from gamma rays (low wavelength) to AM/FM waves (long wavelength). Visible light is in the middle of the EM spectrum. § Violet (400nm) – Red (700nm). Highest to lowest wavelength: ROYGBV o The Sun is one of most common sources of light all over refina take light Light enters pupil and goes to retina, which contains rods and cones & create neral imprise o There are 120 million rods, for night vision sensitive to light § Light comes in, goes through pupil, and hits rod. Normally rod is turned on, but when light hits turns off. § When rod is off, it turns on a bipolar cell, which turns on a retinal ganglion cell, which goes into the optic nerve and enters the brain. o There are 6-7 million cones responsible for color vision § 3 types: red, green, blue , posterior 19 Anterior & · A - r