無(wú)論你是“右派”還是“左撇子”,,鸚鵡或許都能夠告訴你,為什么人們喜歡用一只手勝過(guò)另一只手,。
在一系列的實(shí)驗(yàn)中,,研究人員觀察了來(lái)自16個(gè)品種的322只鸚鵡嘗試用爪子攫取一個(gè)物體——一件玩具或一塊食物——的過(guò)程。由于鳥(niǎo)類(lèi)的眼睛位于頭部?jī)蓚?cè),,因此它們不能像人類(lèi)一樣直視前方;相反,,鳥(niǎo)類(lèi)不得不將頭部轉(zhuǎn)向一側(cè),。然而像人類(lèi)一樣,鸚鵡個(gè)體表現(xiàn)出了對(duì)一只爪子的強(qiáng)烈偏愛(ài):研究人員注意到,,一只“左撇子”鸚鵡會(huì)將頭轉(zhuǎn)向右側(cè),,從而賦予左眼更佳的視野。它隨后會(huì)用“左腳”抓住物體,,這大概因?yàn)橛米笱鄹欉@只爪子會(huì)更為容易,。如果早期動(dòng)物的眼睛像鳥(niǎo)類(lèi)一樣位于頭部的兩側(cè),那么它們使用一側(cè)眼睛來(lái)抓住物體的需要或許導(dǎo)致了使用右手或左手習(xí)慣的進(jìn)化,,研究人員在日前的《生物學(xué)快報(bào)》網(wǎng)絡(luò)版上報(bào)告了這一研究成果,。(生物谷Bioon.com)
生物谷推薦原文出處:
Biol. Lett. doi: 10.1098/rsbl.2010.1121
Cerebral lateralization determines hand preferences in Australian parrots
Culum Brown* and Maria Magat
Individual preference for the use of one limb over the other to explore the environment or manipulate objects is common trait among vertebrates. Here, we explore the hypothesis that limb preference is determined by the engagement of a particular cerebral hemisphere to analyse certain stimuli. We recorded the eye and foot preferences of 322 individuals from 16 species of Australian parrots while investigating potential food items. Across all species, eye preferences explained 99 per cent of the variation in foot use in Australian parrots. The vast majority of species showed significant relationships between eye and foot preferences at the population level.