Electrophysiological and hormonal mechanisms underlying seasonal changes in song behavior in the Gambels white-crowned sparrow Free read é 104

characters Electrophysiological and hormonal mechanisms underlying seasonal changes in song behavior in the Gambels white-crowned sparrow.

Electrophysiological and hormonal mechanisms underlying seasonal changes in song behavior in the Gambels white-crowned sparrow. Free read é 104 ½ Steroid sex hormones can induce dramatic seasonal changes in reproductive related behaviors aRinsic electrophysiological properties of HVC are static across breeding conditions those of RA neurons change I found that these changes in RA electrophysiology occur in wild non laboratory manipulated birds and the speed at which the changes are induced is modulated by photoperiod These electrophysiological changes in RA are dependent upon the activation of androgen and estrogen receptors in its afferent nucleus HVC Antagonizing these receptors blocks increases in song stereotypy but not song rate linking changes in RA electrophysiology and morphology back to behavi.

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He morphological changes have been carefully studied for many years it is not these changes per se that alone underlie changes in song behavior Rather it is how the electrophysiological properties of song control neurons change which in concert with morphology changes the circuit dynamics This dissertation takes some first steps towards understanding this process First in order to ground the neurobiology I determined which aspects of song behavior change on which time scale I then recorded from neurons in the song control nuclei HVC and RA and found that while the int.

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Electrophysiological and hormonal mechanisms underlying seasonal changes in song behavior in the Gambels white crowned sparrowSteroid sex hormones can induce dramatic seasonal changes in reproductive related behaviors and their underlying neural substrates For example in adult white crowned sparrows increased photoperiod raises circulating testosterone triggering morphological and structural changes in song control nuclei which accompany dramatic changes in song behavior Male songbirds can be brought into the laboratory where circulating levels of hormone and photoperiod can be abruptly manipulated providing controlled conditions under which rapid seasonal like changes can be studied While t.