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时间:2018-10-20
《打哈欠真的会传染吗?》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
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
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