Christopher Harshaw

Learn More
Many precocial birds show a robust preference for the maternal call of their own species before and after hatching. This differential responsiveness to species-specific auditory stimuli by embryos and neonates has been the subject of study for more than four decades, but much remains unknown about the dynamics of this ability. Gottlieb [Gottlieb [1971].(More)
We examined the hemodynamic response to afterload reduction by sodium nitroprusside in 7 patients with severe mitral regurgitation of purely valvular origin. Lowering of systemic vascular resistance was associated with major reductions in pulmonary capillary mean (29 +/- 2 to 13 +/- 1 mm Hg) and left ventricular end diastolic (20 +/- 3 to 9 +/- 1 mm Hg)(More)
Studies examining the effects of stimulus contingency on filial imprinting have produced inconsistent findings. In the current study, day-old bobwhite chicks (Colinus virginianus) received individual 5-min sessions in which they were provided contingent, noncontingent, or vicarious exposure to a variant of a bobwhite maternal assembly call. Chicks given(More)
Hunger, thirst and satiety have an enormous influence on cognition, behavior and development, yet we often take for granted that they are simply inborn or innate. Converging data and theory from both comparative and human domains, however, supports the conclusion that the phenomena hunger, thirst and satiety are not innate but rather emerge(More)
Precocial avian hatchlings are typically highly social and show strong species-typical preferences for the maternal calls of their own species. The influence of social contingencies on the acquisition of species-specific preferences has, however, largely been neglected. We found that exposing bobwhite (BW) quail chicks to a Japanese quail (JQ) call(More)
  • 1