Neurons Die Naturally, Songs Degrade (IMAGE) University of Washington Caption The natural die off of neurons in the song center of a sparrow's brain as the breeding season concludes causes a measureable decline in the song that scientists can measure. Credit T Larson/U of Washington Usage Restrictions Credit required License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.