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Chapter 5

Study Guide-Chapter 5

5 Pages

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Steve Joordens

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CHapter 5- Sensation - how the sense system function depends on specific modalty of the info AND on the characteristics of teh information and the state of the brain at the time it recieves it - visual sense is rapidly changing yet appears stable - sound however is not so variably, changes are more gradual - sound carry around obstales, vision does not Sensory Processing -psych define sensation---> detection of simply properties of stimuli, such as brightness - percetpion-->detection of objects, there location, movement and background Transduction -the task of the sense organ is transmit signals to the brain that are coded in such a ways was to rep faithfully the events that have occured -def: literal meaning; leading across. This is the process where sense organs convert energy from the enviro into neural activity -receptor cells; release chem transmitter subs that stimulate other neurons -dendrites respond dircelty ti tge physical stimuli without intervention of specialized receptor cells Sensory Coding -Action potentials cannot be altered and are fixed in size and duration - a code is a system of symbols or signals representing information - two general forms of coding - anamtomical;interpret location and the type of sensory stimulus. since the brain does not have direct info about the phys energy on an organ, it uses this form of coding. eg rubbing eyes. Sensory coding for the body is anat. - Temporal coding;coding interms of time; rate. Can communicate quantative info to the brain. Tells you the intensity, all sensory organs use this PSychophysics --europe birthplace -study of relationships between physical characteristics of stimuli and the sensation they produce -two ways of measuring ppls senses 1.The principal of the Just-Noticable Difference -ernest weber -jnd is directly related to the magnitude of the stimulus -diferent senses had different ratios, these ratio; Weber fractions www.notesolution.com
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