The collected data is subsequently transmitted to a simulator which uses an LED light to "color" water to look like lemonade. Electrodes then send specific impulses to the user's tongue, thereby simulating the sour taste of lemonade.
Researchers held blind taste tests so that subjects could tell them whether the artificially flavored lemonade water tasted like the genuine article. First, subjects were required to do a visual inspection as to which liquid looked more like the real thing. Then, consumption tests -- three of each substance, spanning two sessions -- took place.
The results indicated little difference in terms of visual appearance when the fake lemonade was illuminated with a yellow or green LED; they did suggest, though, that the fake lemonade looked more sour when it was lit up with a white LED.
When tasted, the real lemonades managed to rank higher on the sour scale than their doctored counterparts.