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Clutter affects object discrimination differentially based on distance. A: close clutter (+10 cm) impairs pairwise discrimination of all objects compared with the no clutter condition. B: power spectra for echoes recorded with 10 cm clutter. C: far clutter (+20 cm) interferes with discrimination less than close clutter, and for some object pairs, improves discrimination over the no clutter condition. D: power spectra for echoes recorded with 20 cm clutter.
