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Lecture 19

Psychology Lecture 19.docx

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University of Toronto Scarborough
Steve Joordens

Psychology Lecture 19 Sensation and perceptionErnst Weber interested in our subjective states and perceptions of the world Different weights and you have to see which weights are heavier which lights are brighterHow do we perceive the external worldFinishing the ends of sentences its an instinctive ability for humans to be able to finish sentencesOur brain is a little ahead of our ears the world is being analyzed interpreted and assumptions and predictions are being made as wellBottom upand top down influences memory previous experiences analyzing that input and guiding how we perceive itSensation and perceptionSensation senses input devicessight sound smell Focus on sensory systems How do we go from patterns of light into perceiving human beingsWe need to understand the eye ball to understand how we perceive our sensesViewing optical illusions Perception is the end product of sensation to give you an output Sensation is the detection of simple stimulus properties such as brightness colour sound frequencies sweetness Perception is the detection of objects their location their movements their background Fireworks we perceive it to be fireworks in the city When its really different kinds of lightSensation is the raw sensory inputPerception is what you ultimately see or hear it asTransduction is the first step of sensation The process that changes the physical stimulus from the external world into a neural impulseThe process that changes it from a physical energy into a neural impulse is called transductionDifferent sense organs are sensitive to different kinds of energiesSpecific receptornerve cells react to the energy and stimulate a neural impulseTable 51 different sensory systems and what they are sensitive toSkin can sense touch temperature and vibrationMuscles can sense pain Light we are sensitive to the tiny black bar on the colour scale The world that we perceivetheres a lot more in the world and around us that we just dont see and our sensory systems are our only connections to the external worldMorse code could use to communicate to one anotherWe can communicate a very rich message Temporal codingthe rate of neural firing can help the brain distinguish between different kinds of inputsAnatomical coding the way a message is perceived depends on where it originatedIf you tap on your eye you will perceive flashes of light The action of tapping stimulatesthe receptor cells at the back of the eye and they tell the brian theres light existingPsychophysics physics of the midTwo grey circlesand eventually one of the circles will seem differentErnst weber Webers procedure and he starts with two variables that are equal and trying to see when we humans notice a substantial difference
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