打哈欠真的会传染吗？

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1、打哈欠真的会传染吗？　　人们常说打哈欠会传染，每次你一打呵欠，周围的人也会跟着打哈欠。难道哈欠真的可以传染，还是仅仅是巧合而已？我们来看看神经学家是怎么说的吧！　　“Ayawnisaninstinctivebehavior：Youdon’thavetolearntodoit，andyawnsareevenpresentbeforebirth.”saysRobertProvine，aprofessorofpsychologyandneuroscienceattheUniversityofMaryland，BaltimoreCounty.　　Whenweseesomeoneels

2、eyawn，wedon’tthinktoourselves，“Well，I’llyawn，too.”Itjusthappens——it’sinstinctive，andit’saveryprimalaspectofhumanbehaviorthatgoesbacktoancientherdmentality.　　Adeliepenguins，forinstance，employyawningaspartoftheircourtshipritual.Thehappycouplesfaceoffamidtheicefloesandthemalesengageinwhatisdes

3、cribedasan“ecstaticdisplay，”theirbeaksopenwideandtheirfacespointedskyward.　　Itmaybe，therefore，thatwhenyourentryuponthesceneinspiresaroundofuncontrollableyawning，youhavemerelystumbledontoagaggleofAdeliepenguinsindisguise，whoaresignalingtheirpowerfuleroticlongingforyou.Aslimhope，admittedly，bu

4、tanyportinastorm.　　Asforthelargerquestionofwhyyawnsarecatching，nobodyreallyknows.Factis，wedon’tknowwhypeopleyawn.　　Itwaslongbelievedyouyawnedwhentherewastoomuchcarbondioxideandnotenoughoxygeninyourblood.Apartofyourbraincalledthebrainstemdetectedthisandtriggeredtheyawnreflex.Yourmouthstretch

5、edwideandyouinhaleddeeply，shootingajoltofoxygenintothelungsandthencetothebloodstream.　　Subsequently，youexhaledalotofCO2.Oftenyou’dstretchwhileyawning，whichseemedtotemporarilyimprovecirculation.Youyawnedandstretchedalotmorewhenyougottiredbecauseyourbreathingsloweddown.　　Orsopeoplethought.Inr

6、ecentyears，though，afewradicalshavesaidtheprecedingisallmalarkey.Whoknows，theysay，maybeweyawnbecauseit’stoowarmintheroom.　　Cecilisn’tabouttosettletheissuehere，andhedoesn’tneedto.Wemerelyobservethatwhateveryawn-inducingconditionsprevailforyoualsoapplytoyourfriends.　　Ifyou’reoutlateinsomecrowd

7、eddive，you’reprobablyalltired，allwarmunderthecollar，andallbreathingthesamestaleair.You’reprobablyallonthevergeofayawn，too，andthepowerofsuggestionfromseeingonepersondoitisenoughtopusheverybodyelseovertheedge.　　Adultsrarelycatchacaseoftheyawnsfromachildora