The evolution of dog diet and foraging: Insights from archaeological canids in Siberia.

Research on the evolution of dog foraging and diet has largely focused on scavenging during their initial domestication and genetic adaptations to starch-rich food environments following the advent of agriculture. The Siberian archaeological record evidences other critical shifts in dog foraging and diet that likely characterize Holocene dogs globally. By the Middle Holocene, body size reconstruction for Siberia dogs indicates that most were far smaller than Pleistocene wolves.

Receptive-field structure of direction-selective ganglion cells projecting to the goldfish tectum.

The receptive field of a direction-selective unit of any type consists of an excitatory center 3 degrees -5 degrees in size, a near inhibitory surround and a far surround upon which illumination exerts an influence for both spontaneous activity and specific cell response.