To do so, a set of experimental subjects viewed 30 different food items on a computer screen and reported how much they would pay for those items. (sciencedaily.com)
However, it's promising that contagious scratching is observed among mice, for example, since they're often used as experimental subjects to understand brain diseases. (news.stlpublicradio.org)
Thus, mice, cats and dogs see the world much the way a red - green color - blind person does, making them ideal experimental subjects. (scientificamerican.com)