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Articles 1 - 3 of 3
Full-Text Articles in Animal Sciences
Ecology And Evolution Of Social Information Use, Clare T. M. Doherty
Ecology And Evolution Of Social Information Use, Clare T. M. Doherty
Dartmouth College Ph.D Dissertations
Sociality is a strategy many animals employ to cope with their environments, enabling them to survive and reproduce more successfully than would otherwise be possible. When navigating their environments and making decisions, social individuals often use information provided by conspecifics (in the form of social cues and signals), thereby increasing the scope and reliability of the information they can gather. However, social information use may be influenced by many factors, including key differences in context across the physical and social environment. My thesis asks and answers a series of questions regarding the trade-offs in social information use across different contexts, …
A Computational Psychiatry Approach Identifies How Alpha-2a Noradrenergic Agonist Guanfacine Affects Feature-Based Reinforcement Learning In The Macaque, S. A. Hassani, M. Oemisch, M. Balcarras, S. Westendorff, S Ardid, M. A. Van Der Meer, P. Tiesinga, T. Womelsdorf
A Computational Psychiatry Approach Identifies How Alpha-2a Noradrenergic Agonist Guanfacine Affects Feature-Based Reinforcement Learning In The Macaque, S. A. Hassani, M. Oemisch, M. Balcarras, S. Westendorff, S Ardid, M. A. Van Der Meer, P. Tiesinga, T. Womelsdorf
Dartmouth Scholarship
Noradrenaline is believed to support cognitive flexibility through the alpha 2A noradrenergic receptor (a2A-NAR) acting in prefrontal cortex. Enhanced flexibility has been inferred from improved working memory with the a2A-NA agonist Guanfacine. But it has been unclear whether Guanfacine improves specific attention and learning mechanisms beyond working memory, and whether the drug effects can be formalized computationally to allow single subject predictions. We tested and confirmed these suggestions in a case study with a healthy nonhuman primate performing a feature-based reversal learning task evaluating performance using Bayesian and Reinforcement learning models. In an initial dose-testing phase we found a Guanfacine …
Lidar Remote Sensing Variables Predict Breeding Habitat Of A Neotropical Migrant Bird, Scott J. Goetz, Daniel Steinberg, Matthew G. G. Betts, Richard T. Holmes
Lidar Remote Sensing Variables Predict Breeding Habitat Of A Neotropical Migrant Bird, Scott J. Goetz, Daniel Steinberg, Matthew G. G. Betts, Richard T. Holmes
Dartmouth Scholarship
A topic of recurring interest in ecological research is the degree to which vegetation structure influences the distribution and abundance of species. Here we test the applicability of remote sensing, particularly novel use of waveform lidar measurements, for quantifying the habitat heterogeneity of a contiguous northern hardwoods forest in the northeastern United States. We apply these results to predict the breeding habitat quality, an indicator of reproductive output of a well-studied Neotropical migrant songbird, the Black-throated Blue Warbler (Dendroica caerulescens). We found that using canopy vertical structure metrics provided unique information for models of habitat quality and spatial patterns of …