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Lecture 1

PSYC 2390 Lecture Notes - Lecture 1: Retina, Membrane Potential, Oscilloscope


Department
Psychology
Course Code
PSYC 2390
Professor
Lana Trick
Lecture
1

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Jan12th,2016,Lecture1
Overview:processesinvolvedinperception
Transduction
● Changingenergyfromoneformtoanother
● Nervoussystemiselectric:chargesrunningupanddownnerves
● Vision:lightenergy,formofelectromagneticradiation.Thisthenfeedsintotheelectrical
system
○ Distalstimulation:(distal:faraway),lightcomesofftheobjectandbouncesinto
oureye.
○ Coloursreflectlightdifferently,black:verylittlereflection,white:lotsofreflection,
red:onlyreflectsredlight,etc.
○ Proximalstimulation:lightbeingshoneontotheretina(backoftheeye),thisis
whatwe’reactuallyrespondingto,notthedistalstimulation.
■ whatyouseeisthepatternoflightbeingshoneonthebackoftheeye
● Hearing:mechanicalenergy,occurswhenmoleculeshitup/pushesagainstanother
molecule.Eachmoleculehitseachotheronebyonecreatingawavepattern,reaching
theear,thenfeedsintotheelectricalsystem
Interpretation
● Ksomethingstructure:whenthere'slike3circleswithlinestomakeitlooklikeatriangle
istherebutthere’snotriangle,yourbraininterpretswhatiscausingthelinessoitmakes
thetriangle.
Thephysiologyofperception
Neuronanditsparts
● “Wires”intheelectricalsystem
● Whyelectricalshocktherapyissoharmful,justlikehowapowersurgeisharmfulfora
computer
● Reviewofneuronstructure
○ Dendrites:receiveinformation
○ Axon:sendinginformationdownthecellawayfromthedendrites
■ width,somearebig(fast)andsomearenarrow(slow).Sizedetermines
howquicklyandelectricpulsetravels.
○ Myelinsheath:shapedsimilartosmall“bubbles”.Thickenstheaxontosend
messagesfaster,byhavingtheinformationjumpfromonepositionontheneuron
toanother,fasterthantravelingstraightdownit.
■ MS(multiplesclerosis)disordercausingthemyelintobreakdownand
lossofabilitytosendinformationdowntheaxon.
■ Babiesbornwithoutmuchmyelin,theyhavealltheaxonstheyneedbutif
theywerebornwithmyelintheirskullswouldhavetobemuchbigger.
Graduallygrowsinfromheadtofoot(controlofhead/armsbeforelegs).
Howinformationistransferredinsideasingleneuron(presynaptictransmission)
● Atoms:discussedwhatanelectron,neutron,protonis.
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