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itmightbethecheeksflushingwithembarrassmentoravoicechokingwithemotion

ourphysicalreactionscanrevealwhatwetrulyfeel

andsomethinktheycanshowwhensomeoneslying

typically

whenapersontellsaleg

theybegintosweat

imsure

weveallseentheninenineteenfortiesandfiftiesinterrogationmovies

wherethepersoninahotseat

uhhasasweattybrowlorasweattyupperlitorperhapssweatdrippingdownfromtheirsideburns

rightifyouleanforwardinthechair

couldturnsoutfunnyylikeyouregoingtodiveintoaswimmingpullthisagoaroundyourstumppjacktramarcouitsphysicalsensationstoprobefortruthitsprimarytooltheliedetectororponelygraphed

andthiscouffisjustliketheoneofthedoctorpolygraph

whichworkstakeverysimilartoanyotherbiofeedbackinstrumentthatsimplyrecordsdeviationsfromapersonsphysiologicalnormit

suchassomeonesbloodpressuregoingupandthencomingbackdownorperhaps

adecreaseoranincreaseinpulserateorsweattlyinactivity

butyousometimesonhisbody

yes

apolygraphexaminerknowswhattolookforwhenquestioningsomewheredoyouintendtobecompletelytruthfulwithme

yes

anydeviationfromnormalgoodsignaldeception

ourbodycangiveusaway

andareyousurethatiwonttrytotrickyouonthistest

yes

wewethinkwewerebeingcool

butwhenwerestressed

ournetworkofnervestartstoprepareourbodyforaction

asifitsunderattack

itsaresponsethatheartsbacktoourancientancestorsfightorflight

itstartsbytriggeringyourstressharmonajrenalineyourheartrateincreasestopumpmorebloodtoyourmuscles

asifyouwereabouttogointobattleyourebreathingfeevensasvitaloxygenreachesyourmuscles

andyoubegintosweatthebodycools

sothatyouwnoverheepwhatrushedintoaction

thebrainwontletusstopthesurvivalstrategy

thesebasicnervousfunctionsareautomaticthats

whyapolygraphcanoftenuncoveraliar