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Article

Hormones and Animal Communication  

Eliot A. Brenowitz

Animals produce communication signals to attract mates and deter rivals during their breeding season. The coincidence in timing results from the modulation of signaling behavior and neural activity by sex steroid hormones associated with reproduction. Adrenal steroids can influence signaling for aggressive interactions outside the breeding season. Androgenic and estrogenic hormones act on brain circuits that regulate the motivation to produce and respond to signals, the motor production of signals, and the sensory perception of signals. Signal perception, in turn, can stimulate gonadal development.

Article

Neurobiology of Obstructive Sleep Apnea  

Steven Holfinger, M. Melanie Lyons, Nitin Bhatt, and Ulysses Magalang

Obstructive sleep apnea is recognized as a heterogeneous disease presenting with varying underlying risk factors, phenotypes, and responses to therapy. This clinical variance is in part due to the complex pathophysiology of sleep apnea. While multiple anatomical issues can predispose to the development of sleep apnea, factors that control the airway musculature also contribute via different pathophysiologic mechanisms. As sleep apnea does not occur during wakefulness, the impact of sleep stages on respiration is of critical importance. Altogether, understanding sleep apnea pathophysiology helps to guide current treatment modalities and helps identify potential targets for future therapies.