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Sparrows can benefit from Steroids

Journal of Neuroscience, Eliot Brenowitz and his colleagues reported that the Gambel’s white-crowned sparrow birds attract their mates and create more neuronal connections which trigger their brains, all because of increased levels of testosterone. This steroid thus increases the size of song production areas of birds’ brain.

Researchers studied on 19 adult male white-crowned sparrows, out of them 11 were surgically deafened. A week after the surgery, all of the birds were given testosterone implants and shifted to long-day light conditions, which are normal breeding conditions.

From Brightsurf:

The birds’ three song-control regions are called the HVC, RA and X. All are located in the forebrain and grow quickly and in sequence. The brains of the birds were examined after 7 and 30 days, and the volume of the song production areas did not differ between the deafened and the hearing sparrows. Even though the deafened birds sang considerably less often, there was no degradation in the structure of their songs, according to Brenowitz.

“This study suggests that playing tapes of recorded speech to try to help a person recover language after a stroke might not be productive. But perhaps we could use neutrophins, growth-inducing proteins whose synthesis by brain neurons is stimulated by testosterone. In sparrows, brain areas are directly stimulated by these hormones to grow and one day such hormones might possibly help repair brain damage caused by strokes or neurodegenerative diseases,” said Brenowitz.

A bird’s brain has three controls- called the HVC, RA and X. All are located in the forebrain and grow quickly and in sequence.

After examining the birds after 7 and 30 days, results showed that there was no difference in the volume of the song production areas of the deafened and the hearing sparrows.

Studies also proved that seasonal growth of these song production areas of the brain does not require hearing or high levels of singing. Brenowitz said, “Such hormones might possibly help repair brain damage caused by strokes or neurodegenerative diseases.”

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