Chapter 5 - Chapter 5 Chapter 5: Sensation I. Some Useful...

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Chapter 5 Chapter 5: Sensation I. Some Useful definitions II. Basic Principles III. Vision IV. Hearing V. Other Senses I . Some Useful Definitions - Sensation: the process by which sense organs (ie eyes) are activated by a stimulation, by an energy from the physical world. This energy is going to be translated into an electrical msg that is going to be sent to the brain for further processing. - Perception: the brain is going to use the information sent by the senses, it’s going to select, organize, integrate, and interpret into something meaningful. - You can’t have perception without sensation because perception is analyzing the info by sensation but you can have sensation without perception. - Bottom-up processing: Sensation is described as this. Take the very basic units and you build up. Start with MOST basic, elementary information and build up. “doing something from scratch” - Top-down processing: perception is described as this. You’re gonna use your knowledge, existing knowledge, assumptions, expectations to analyze and process the data. EX: reading a word that’s misspelled - Prosopagnosia: people who suffer from this are people who are unable to recognize familiar faces including their face (usually from an injury to the temporal lobe). - Psychophysics: an exciting branch in psychology. Principles of psychology and physics. Field that helped in understanding psychology. Researchers study relationships between the attributes of physical world and its properties and our psychological experiences of them. - Sensory receptors: specialized cells in the nervous system. They don’t get activated by neurotransmitters. They’re activated by energy in the physical world (ex sound waves). They will take this energy and translate it into an
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Chapter 5 electrical msg (neural msg) or into an action potential. Then they transmit the energy to the brain for further processing. II. Basic Principles 1. Detection & Transduction - We must be able to detect energy in the physical world in order to have sensation. Our organs only allow us to detect tiny fraction of energy of physical world. Do we really see and experience the world as it is? - There must be transduction: transformation of the energy of the physical world into the neural world and then to the brain - Sensation: the detection and transduction of the physical world 2. Absolute Threshold - The energy that we detect must be strong enough for us to detect. - Absolute Threshold: the minimum amount of energy/stimulation that must be there in order for us to detect it fifty percent of the time. - On avg, on a clear night, we can see a clear light of a candle that’s 50 km away from us - AT: varies from one person to the next, varies for the same person from one time to another - Signal Detection: Part of psychophysics and theorists tell us that when it comes to detecting stimulation, energy in the physical world, our ability to do so has to do with two things: how strong the stimulus is AND with our
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This note was uploaded on 01/13/2010 for the course PSY psy1101 taught by Professor Haddad during the Spring '09 term at University of Ottawa.

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Chapter 5 - Chapter 5 Chapter 5: Sensation I. Some Useful...

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