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at 2444 × 1224 in Scientists Find Brain Cells That Know Which End Is Up.

These images used in the study provoked some of the strongest response from neurons that help the rhesus monkeys subjects understand the direction of gravity. (Credit: Johns Hopkins University)

These images used in the study provoked some of the strongest response from neurons that help the rhesus monkeys subjects understand the direction of gravity. (Credit: Johns Hopkins University)