Your eyes play tricks. And your brain makes it worse. Both teenagers and adults misjudge how much they pour into glasses. They will pour more into short wide glasses than into tall slender glasses, but perceive the opposite to be true. The delusion of shape even influences experienced bartenders, though to a lesser degree, a researcher at the University of Illinois at Urbana-Champaign has found.
How shape can alter a person’s notion of size has been widely investigated. For instance, triangles are generally perceived to be larger than squares, and horizontal shapes are seen as smaller than vertical objects of identical volume.
Yet research examining the effects of shape on how people determine how much they consume is limited, said Brian Wansink, a professor of marketing and nutritional science at Illinois. To understand the process better, Wansink examined how shape influences teenagers, adults and bartenders who pour beverages into empty glasses.
Mark Reutter | EurekAlert!
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