Week 5 Sensation and Perception PDF

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Week 5 Sensation and Perception Chapter 3 for Introductory psychology PSY2100 ...

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PSY 2100 08/02/2019

Sensation and Perception Week 5 Notes: Chapter 3 Last Chapter 1. Information transfer a. Neurons, action potential 2. Information regions a. Visual cortex, association cortex This chapter 1. Information detection a. Sense organs, stimulus energy, detection, transduction, transmission to brain, feature detection 2. Information processing Vision - The stimulus input - Electromagnetic energy : the sun - The difference is how fast its moving Hue, brightness and saturation - Wavelength of light determines the hue that we will experience - Hue = colour - Amplitude of the wavelength determines the brightness of the colour - Higher amplitude, brighter colour - Lower amplitude, duller colour - Saturation of wavelengths determines the purity of the colour - Saturation = purity - Greater saturation = greater purity The Eye - Detect and transducer electromagnetic radiation - Transduction is the conversion of the form of energy into another - Cornea - Pupil - Iris - Lens - Retina - Accomodation: muscles changing the shape of the lense for near or far - muscle pulling on the lense - Not the same as constriction and dilation of the pupil The Retina - A main nerve

PSY 2100 08/02/2019 Rods and Cones - 120 million rods - 6 million cones - 1 million ganglion cells - Cones mostly in center of retina (fovea) - Rods are mostly in periphery - Cones are sensitive to wavelengths - Light - Rods do not care they respond to any of it - Rods work harder at night when its dark Blind Spot - Axons from the ganglion cells converge and leave the eye in the middle of the retina, near the fovea - There is a hole in your retina where there are no receptor cells - Brain has no direct information about a small area of your visual field - But it has indirect information - The other eye - Eye movements - Take away the indirect information, and your brain fills in the information by making its best guess based on the adjacent areas of the retina Feature Detection - Optic nerve carries information to the primary visual cortex - Via thalamus - Feature detection cells respond to the various features of an object - Form (edges, lines, angles), movement, colours, depth - Parallel processing - The various features are extracted simultaneously - The visual association areas contain clusters of cells that respond to complex patterns constructed from the combination of individual features Colour Vision - Young-helmholtz trichromatic theory - Any colour created by combining light waves of three primary colours Colour Constancy - Perceiving familiar objects as having consistent colour even if changing illumination alters the objects - Different sources of light emit different relative amounts of different visible light wavelengths...