Siffar Hourglass Ba Alamar Haihuwa da Lafiya ba ce

Na halarci tarurruka da yawa a cikin shekaru arba'in da suka gabata, kuma tattaunawa da yawa da na ji sun burge ni. Sau da yawa na dawo gida cikin wahayi ba kawai ta yadda muka koya game da yanayin ɗan adam ba amma har da ƙasƙantar da kai don yawan abin da za a koya.

Kwanan nan na halarci taron shekara -shekara na 31 na Halayyar Dan Adam da Kungiyar Juyin Halitta (HBES). Tsawon shekaru, masu halarta a wannan taron sun haɗa da wasu fitattun mutane a doron ƙasa (gami da EE Wilson, Richard Dawkins, Leda Cosmides, Sarah Hrdy, Steven Pinker, da Napoleon Chagnon).

Taron HBES koyaushe yana da ban sha'awa musamman, kuma taron makon da ya gabata ya sake nuna ainihin abin da zan koya.

Lokacin yana da kyau a gano kun yi kuskure

Akwai rashin fahimta ta musamman game da kimiyya, kuma ita ce wacce ta ci gaba da samun ci gaba har ma da manyan masu ilimi, gami da furofesoshi da yawa a cikin ilimin ɗan adam da kimiyyar zamantakewa. Wannan kuskuren shine imani na kimiyya abu ne mai sauƙi na zaɓin mutum da ɗanɗanar mutum. A kan wannan ra'ayi, babu wani abu kamar ci gaban kimiyya, kawai jerin abubuwan sabani na tarihi na canjin yanayi, ko canje -canje a cikin abin da hip yayi imani da shi a yau.

Amma a zahiri, alamar tsarin kimiyya shine yunƙurin yin amfani da tsauraran matakai don ladabtar da son zuciya, don shawo kan fifikon fifikon mu game da yadda yakamata gaskiya ta kasance, da kuma tilasta mana yin la'akari da hujja da gaske cewa gaskiya na iya zama, a zahiri. ya bambanta da yadda muka saba yi imani.

Ba wai masana kimiyya ba su kasance masu saukin kai ga duk son zuciya da fifiko iri ɗaya kamar kowa, amma idan suna yin aikinsu yadda yakamata, suna samun hanyoyin tilastawa kansu yin la'akari da shaidu na gaskiya ko akan waɗannan son zuciya. (duba Kimiyya na Tunanin Kimiyya)

Don haka, yakamata ya zama mai gamsarwa musamman ga masanin kimiyya ya canza ra'ayinsa ta fuskar shaida. Amma saboda duk son zuciya mai ƙarfi, sabon shaidar dole ne ta kasance mai ƙarfi da gamsarwa.

Don haka, na yi farin ciki lokacin da na ji masana ilimin halayyar ɗan adam na UCSB Steve Gaulin da William Lassek suna ba da adireshin taro wanda a zahiri ya canza tunanina game da wani abu da na yi imani da shi a baya.

Ga abin da na yi imani: “Mata masu ƙarancin raunin kugu-zuwa-hip (a kusa .7) sun kasance masu koshin lafiya da haihuwa, kuma suna da yara masu koshin lafiya.”

Na yi imani da ƙarfi sosai cewa a zahiri na faɗi waɗannan ainihin kalmomin a cikin littafin ilimin halin ɗan adam na zamantakewa (Kenrick, Neuberg, Cialdini, & Lundberg-Kenrick, 2019). Kuma ba ni kaɗai ba ne na gaskanta wannan, a zahiri, shine bayanin da Dev Singh ya bayar, wanda ya fara aikin nuna cewa maza suna da sha'awar mata masu ƙarancin raunin kugu-zuwa-hip.

Amma zancen Gaulin da Lassek sun gabatar da shaidar da ta kai ni ga canza ra'ayina gaba ɗaya. Sannan sun sauƙaƙe hadiyewa ta hanyar gabatar da shaidu waɗanda suka ba da shawarar wani dalili na daidaitawa don fifikon maza da yawa ga mata masu adadi na agogo (aka a .7 kugu zuwa rabo hip).

To, me ke faruwa? Dangane da shaidar da Gaulin da Lassek suka gabatar, kuma aka buga su a cikin wasu labaran kwanan nan a cikin mujallar Ilimin Juyin Halitta , a zahiri ya fi koshin lafiya ga mace ta ɗauki ƙarin kitse na jiki, koda lokacin da aka adana wannan kitse a tsakiyar ta. Bugu da ƙari, mata masu ɗan ƙaramin kitse na zahiri sun fi haihuwa (Lassek & Gaulin, 2018a; 2018b).

Idan ba lafiya da haihuwa ba, me ke sa raunin ƙugu-zuwa-hip ya zama abin sha'awa?

Shin sha’awar maza ga mata masu kunkuntar kugu kawai na ɓarna ne? A'a. Gaulin da Lassen sun ce, kunkuntar kugu dangane da kwatangwalo alama ce ta samarin da suka balaga (ana samun rarraba kitse a cikin mata tun suna ƙuruciya; ƙananan 'yan mata suna da ƙanƙantar da kai dangane da kugu; tsofaffi mata suna da faffadan kwatangwalo, amma haka kuma an kara yawan kitse a kugu, musamman bayan sun haifi yara). Da zarar yarinya ta balaga, sai ta fara rarraba wani irin kitse a ƙugu da cinyoyinta - omega 3 fatty acid. Wannan kitse yana da mahimmanci musamman ga ci gaban kwakwalwar ɗiyanta mai yuwuwa.

Adadin agogon agogo alama ce ba cewa yanzu matashiya tana da yawan haihuwa, amma har yanzu ba ta haifi yara ba, kuma da alama za ta haifi 'ya'ya masu ƙoshin lafiya da ƙwaƙƙwaran kwakwalwa. A cikin al'adun gargajiya, waɗannan haihuwar na iya faruwa kusan shekaru goma bayan shekarun mafi kyawun raunin kugu-da-hip.

Don haka, budurwar da .7 kugu-zuwa-hip ba ta da yawa kamar nubile (a cikin ma'anar balaga, amma ba ta haifi ɗa ba tukuna).

Gaskiyar cewa maza suna da sha'awar zaɓar mata masu irin sifar jikin nan, in ji Gaulin da Lassen, nuni ne cewa kakanninmu maza sun kasance a ciki na dogon lokaci. Idan suna neman abokan haɗin gwiwa kawai na ɗan gajeren lokaci, za su zaɓi abokan haɗin gwiwa kaɗan kaɗan tare da ƙarin kitse na jiki, waɗanda wataƙila za su iya haihuwa sosai a cikin 'yan watanni masu zuwa. Maimakon haka, zaɓin maza yana nuna cewa suna zaɓar abokan haɗin gwiwa waɗanda suka balaga, amma waɗanda ke da matsakaicin adadin shekarun haihuwa.

Shafukan yanar gizo masu alaƙa akan matasa da ilimin halittar sha'awa

• Hankali a matsayin littafin canza launi. Tattaunawa game da jan hankalin duniya tsakanin tsofaffi maza da ƙanana mata, da wasu bayyanannun al'adu.
• Hankali azaman littafin canza launi 2: Bayanin dalilin da yasa samari a cikin al'ummar Tiwi duk suna auren tsofaffi mata, kuma me yasa hakan ba hujja bane na tunanin Blank Slate.
• Jima'i, ƙarya, da manyan bayanai. Ta yaya danna kan OK Cupid ke yin tunani game da jan hankalin duniya tsakanin tsofaffi da ƙananan mata?
• Shin ovulation yana canza sha'awar jima'i na mata, bayan duka? Rahotanni kan wani abu mai ban sha'awa da na koya a tarurrukan kwanan nan na Ƙungiyar Halayen Dan Adam da Juyin Halitta.
• Me yasa ake hada 'yan wasan Hollywood da irin wadannan' yan mata?
• Hanya tsakanin shekarun karuwanci da samun kudin shiga.
• Tsofaffi maza, ƙananan mata, da ilimin halin ki.

Lassek, WD, & Gaulin, SJ (2018a). Shin Ƙananan WHRs da BMIs sun yanke hukunci mafi yawan jan hankali suna nuna Haihuwa mafi girma? Ilimin Juyin Halitta, 16 (4), 1474704918800063.

Lassek, WD, & Gaulin, SJ (2018b). Shin Ƙananan WHRs da BMIs da aka Hukunta Mafi Yawan Sha'awa suna Nuna Kyakkyawan Lafiya? Ilimin Juyin Halitta, 16 (4), 1474704918803998.

Singh, D. (1993). Mahimmancin daidaitawa na kwarjini na mace: Matsayin rabo na kugu-zuwa-hip. Jaridar Mutum & Ilimin halin ɗan adam, 66, 298.