title: Songbirds use spectral shape, not pitch, for sound pattern recognition.
abstract: Humans easily recognize "transposed" musical melodies shifted up or down in log frequency. Surprisingly, songbirds seem to lack this capacity, although they can learn to recognize human melodies and use complex acoustic sequences for communication. Decades of research have led to the widespread belief that songbirds, unlike humans, are strongly biased to use absolute pitch (AP) in melody recognition. This work relies almost exclusively on acoustically simple stimuli that may belie sensitivities to more complex spectral features. Here, we investigate melody recognition in a species of songbird, the European Starling (Sturnus vulgaris), using tone sequences that vary in both pitch and timbre. We find that small manipulations altering either pitch or timbre independently can drive melody recognition to chance, suggesting that both percepts are poor descriptors of the perceptual cues used by birds for this task. Instead we show that melody recognition can generalize even in the absence of pitch, as long as the spectral shapes of the constituent tones are preserved. These results challenge conventional views regarding the use of pitch cues in nonhuman auditory sequence recognition.
authors.affiliation: Department of Cognitive Science, University of California, San Diego, La Jolla, CA 92093;
authors.forename: Micah R
authors.initials: MR
authors.lastname: Bregman
authors.affiliation: Department of Psychology, Tufts University, Medford, MA 02155;
authors.forename: Aniruddh D
authors.initials: AD
authors.lastname: Patel
authors.affiliation: Department of Psychology, University of California, San Diego, La Jolla, CA 92093; Section of Neurobiology, University of California, San Diego, La Jolla, CA 92093; Neurosciences Graduate Program, University of California, San Diego, La Jolla, CA 92093; Kavli Institute for Brain and Mind, La Jolla, CA 92093 tgentner@ucsd.edu.
authors.forename: Timothy Q
authors.initials: TQ
authors.lastname: Gentner
mesh_terms: D000161:Acoustic Stimulation; D000818:Animals; D001522:Behavior, Animal; D009622:Noise; D046709:Pattern Recognition, Physiological / Q000502:physiology*; D010898:Pitch Perception / Q000502:physiology*; D013016:Sound; D013018:Sound Spectrography; D046749:Starlings / Q000502:physiology*
keywords: absolute pitch; comparative cognition; pattern perception; pitch processing; songbirds
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