Le sopracciglia sono un vantaggio evolutivo


A che cosa servono le sopracciglia? A proteggere gli occhi da particelle di sporco e sudore, certo, ma anche a metterci in connessione con altri esseri umani. Secondo una ricerca pubblicata tempo fa su Nature Ecology and Evolution, la capacità di apparire amichevoli o intimidenti è ben espressa dalla forma delle ossa del cranio: oggi non avremmo sopracciglia capaci di alzarsi e aggrottarsi, se nel tempo non avessimo perso un ingombrante osso della fronte.

Valore aggiunto. Come raccontano i ricercatori dell’Università di York, autori dello studio, le specie più antiche mostravano, rispetto ai Sapiens, ossa aggettanti sopra agli occhi, che sfruttavano per incutere timore a distanza. Con il tempo, il cranio si sarebbe appiattito e allargato per fare spazio a cervelli più grandi, spianando la strada a un importante strumento di comunicazione sociale: le sopracciglia, utili per veicolare empatia, sorpresa, disgusto, disappunto e, in generale, trasmettere stati d’animo.


Il cranio di Kabwe 1, in primo piano, e quello di un umano arcaico.
© Paul O’Higgins/University of York

Per esclusione. Il gruppo di ricerca ha cercato di spiegare perché i nostri lontani cugini – come i Neanderthal – avessero arcate sopraccigliari così prominenti, che ai Sapiens mancano.

Utilizzando software per le ricostruzioni tridimensionali, gli scienziati hanno confrontato un modello di cranio fossile di un Sapiens con quello di un Homo heidelbergensis vissuto in Zambia tra i 300 mila e i 125 mila anni fa (noto come “Kabwe 1”).

Hanno così potuto escludere che la spessa arcata sopraccigliare servisse a riempire lo spazio tra l’alloggiamento del cervello e l’inizio della fronte; e anche che avesse uno scopo nel favorire la masticazione – due ipotesi avanzate per spiegare questo tratto del viso. Sul piatto rimane la funzione sociale: un osso…



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