Scientists Investigate How Crows Decode Visual Motion Without a Neocortex

In a recent study, neurobiologists examined how crows determine the direction of a drifting cloud of flickering specks—a classic random‑dot‑motion task used to probe decision‑making in primates. In mammals, neurons in the neocortex accumulate visual evidence over time, with firing rates rising until a threshold triggers a choice. Birds, however, lack a neocortex, raising the question of how their brains encode similar decisions. The research, led by Andreas Nieder at the University of Tübingen, seeks to uncover the neural circuitry that allows crows to process motion cues and reach a perceptual conclusion. By comparing avian and mammalian strategies, the study aims to broaden understanding of how diverse brain architectures support rapid visual judgments.