A comparison between two ways to measure minimum frequency and an experimental test of vocal plasticity in red-winged blackbirds in response to noise
| Autor: | Alejandro A. Ríos-Chelén, Gavin C. Lee, Gail L. Patricelli |
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| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Communication medicine.medical_specialty Energy distribution business.industry 05 social sciences Small sample Audiology Plasticity 010603 evolutionary biology 01 natural sciences Measure (mathematics) Behavioral Neuroscience Noise Duration (music) Roadway noise medicine Spectrogram 0501 psychology and cognitive sciences Animal Science and Zoology 050102 behavioral science & comparative psychology business Psychology |
| Zdroj: | Behaviour. 153:1445-1472 |
| ISSN: | 1568-539X |
| DOI: | 10.1163/1568539x-00003390 |
| Popis: | We examined whether red-winged blackbirds modulate their vocalizations in response to experimental highway noise, alternating between ambient-control and noise-playback periods. Our measures of song duration were shorter, and with a lower value of freq5% (a measure of energy distribution), during noise-playback; however, we interpret these results as noise-induced artefacts. This apparent lack of vocal plasticity should be taken cautiously because we had a small sample size and most birds produced only one song type: song type-related vocal plasticity was unlikely to be found. We found no evidence of a shift in minimum frequency with noise when this was measured with a threshold method on power spectra, but it seemed to increase when measured by eye from spectrograms. Our results suggest that the by-eye practice can lead to bias, which is problematic as several previous studies have used this procedure. Use of the threshold method, over the by-eye practice, is encouraged. |
| Databáze: | OpenAIRE |
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