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Neurologgers unveil the neural correlate of spatial cognition in 3D and large spaces. (A) In 3D space, place fields (blue spheres) of bat grid cells are arranged as if they were balls packed in a box. (B) A single place cell in the hippocampal CA1 of bats has multiple place fields (blue arcs) with variable sizes during the flight in a 200-m-long tunnel. (C) Electroencephalogram (EEG) in the hyperpallium of frigatebirds alternates between sleep states in each hemisphere.
