Reading Time: < 1 minuteDec. 30 (UPI) -- Testosterone introduced to specific regions of the male canary's brain affects the frequency and quality of songs, which are used to attract females. Researchers at Johns Hopkins University divided the 20 male canaries into three groups. One group was given testosterone injections in one specific area of the brain -- the medial preoptic nucleus, or POM, which affects sexual motivation. The second group was given testosterone that acted throughout the brain and the third group was given no testosterone. The birds that received targeted testosterone sang at a higher rate, but some sang very poorly, and … Read more
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