Asymmetrical number-space mapping in the avian brain

► The ms clarifies the nature of already described avian pseudoneglect-like behaviour. ► Numerical information is spontaneously encoded by chicks. ► Numerical (ordinal) computation would be bilateral (both hemispheres). ► Spatial information is processed unilaterally (into the right hemisphere). ► The left-ward bias depends on coupling of numerical and spatial representations.