The test sub­ject is given a taste­less cookie

Science Illustrated - - FOOD -

with a sym­bol on its sur­face. The sym­bol al­lows soft­ware to cre­ate a graphic sur­face struc­ture such as choco­late coat­ing and fol­low the cookie, al­though the test sub­ject moves it about one way or the other.

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