Why do our eyes widen in fear and nar­row in dis­gust?

Daily Trust - - HEALTH -

Think about the last time you were home alone and you heard a loud, un­ex­pected noise. Chances are, your eyes widened as you lis­tened for more in­for­ma­tion.Inanew­pa­per,re­searchers have de­tailed why this hap­pens, as well as why our eyes nar­row when some­thing dis­gusts us. The re­searchers, led by Prof. Adam An­der­son sug­gest these op­po­site fa­cial ex­pres­sions are based on emo­tional re­sponses that use the way our eyes gather and fo­cus light to de­tect uniden­ti­fied threats. When our eyes open wider - as they do in fear - the re­searchers say this in­creases sen­si­tiv­ity and ex­pands our field of vi­sion to iden­tify sur­round­ing dan­ger. Al­ter­na­tively, when our eyes nar­row in dis­gust, this blocks light and sharp­ens fo­cus to de­ter­mine the source of our dis­plea­sure.

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