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Your brain finds it easy to size up four objects but not five — here’s why
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doi: https://doi.org/10.1038/d41586-023-03136-w
References
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Kutter, E. F., Bostroem, J., Elger, C. E., Mormann, F. & Nieder, A. Neuron 100, 753–761 (2018).