The crows were trained to peck at the screen or move their heads if the two images matched one another, and to remain still if they did not match. In each trial, a grey screen containing zero to four black dots popped up in front of the crows this "sample" image was followed by a "test" image containing either the same or a different number of dots. In the new study, published June 2 in The Journal of Neuroscience, the team ran experiments with two male carrion crows ( Corvus corone), during which the birds sat on a wooden perch and interacted with a computer monitor in front of them. The birds' brain activity patterns also support the idea that zero falls before "1" on crows' mental number line, so to speak. And now, by peering into the brains of crows, Nieder and his colleagues have discovered that the birds' nerve cells, or neurons, encode "zero" as they do other numbers. thinking that is detached from empirical reality," Nieder said. Zero represents that emptiness, the absence of apples, and "that obviously requires very abstract thinking.
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