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Chapter 1-4

PS262 Chapter 1-4.docx

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Wilfrid Laurier University
Elizabeth Olds

PS262Chapter109212013goal is to understand the human model starting with the detectors the eyes ears skin receptors and receptors in the nose and mouth and then moving on to the computer the brain Want to understand how we sense things in the environment and understand them the skeptic might say for vision a picture of the environment is focused on the back of my eye and that picture provides all the information my brain needs to duplicate the environment in my consciousnessthis has lead people on the wrong track for yearsWhy Read This BookHelp you in later studiesFuture studies in medicine or related fields Studying perception can help you become more aware of the nature of your own perceptual experiencesYou will learn as you study perception is that everything you see hear taste feel or smell is created by the mechanisms of your sensesperception depends on the properties of the sensory receptors The Perceptual ProcessPerception is a long and winding roadThe road begins outside of you with stimuli in the environmenttrees buildings birds chirping smells in the airThe road ends with the behavioral responses of perceiving recognizing and taking actionThis journey is called the perception process which contains 7 steps Must remember that this is a simplified process because we could go far beyond a tree to describe it much betterStimuli Steps 1 and 2 begins with the environmental stimulus the tree that the person is observing Step 1persons perception is based on the light reflected from the tree step 2Principle of transformationwhich states that stimuli and responsescreated bystimuli are transformed or changed between the environmental stimulus and perceptionWhen reflected light reaches the eye it is transformed as it is focused by the eyes optical system which is the cornea at the front of the eye and the lens directly behind itthey form a sharp image of the tree on the receptors of the persons retina a 04mm thick network of nerve cells that covers the back of the eye and that contains the receptors for visionPrinciple of representation which states that everything a personperceives is based not on direct contact with stimuli but on representations of stimuli that are formed on the receptors and on activity in the persons nervous systemReceptor ProcessesTransduction Step 3Sensory receptorscells that are specialized to respond to environmental energy with each sensory systems receptors specialized to respond to a specific type of energyVisual Receptorsrespond to lightAuditory Receptorsrespond to pressure changes in the air
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