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Internal state dynamics shape brainwide activity and foraging behaviour 期刊论文
NATURE, 2020, 577 (7789) : 239-+
作者:  Marques, Joao C.;  Li, Meng;  Schaak, Diane;  Robson, Drew N.;  Li, Jennifer M.
收藏  |  浏览/下载:22/0  |  提交时间:2020/07/03

The brain has persistent internal states that can modulate every aspect of an animal'  s mental experience(1-4). In complex tasks such as foraging, the internal state is dynamic(5-8). Caenorhabditis elegans alternate between local search and global dispersal(5). Rodents and primates exhibit trade-offs between exploitation and exploration(6,7). However, fundamental questions remain about how persistent states are maintained in the brain, which upstream networks drive state transitions and how state-encoding neurons exert neuromodulatory effects on sensory perception and decision-making to govern appropriate behaviour. Here, using tracking microscopy to monitor whole-brain neuronal activity at cellular resolution in freely moving zebrafish larvae(9), we show that zebrafish spontaneously alternate between two persistent internal states during foraging for live prey (Paramecia). In the exploitation state, the animal inhibits locomotion and promotes hunting, generating small, localized trajectories. In the exploration state, the animal promotes locomotion and suppresses hunting, generating long-ranging trajectories that enhance spatial dispersion. We uncover a dorsal raphe subpopulation with persistent activity that robustly encodes the exploitation state. The exploitation-state-encoding neurons, together with a multimodal trigger network that is associated with state transitions, form a stochastically activated nonlinear dynamical system. The activity of this oscillatory network correlates with a global retuning of sensorimotor transformations during foraging that leads to marked changes in both the motivation to hunt for prey and the accuracy of motor sequences during hunting. This work reveals an important hidden variable that shapes the temporal structure of motivation and decision-making.


  
Is stump removal for bioenergy production effective in reducing pine weevil (Hylobius abietis) and Hylastes spp. breeding and feeding activities at regeneration sites? 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2018, 424: 184-190
作者:  Rahman, Abul;  Viiri, Heli;  Tikkanen, Olli-Pekka
收藏  |  浏览/下载:9/0  |  提交时间:2019/04/09
Logging  Stump removal  Roots  Forest pests  Larvae  
Phenological and distributional shifts in ichthyoplankton associated with recent warming in the northeast Pacific Ocean 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (1) : 259-272
作者:  Auth, Toby D.;  Daly, Elizabeth A.;  Brodeur, Richard D.;  Fisher, Jennifer L.
收藏  |  浏览/下载:22/0  |  提交时间:2019/04/09
California Current  El Nino  fish larvae  ichthyoplankton  Pacific Ocean  phenology  warm blob  
A new offshore transport mechanism for shoreline-released tracer induced by transient rip currents and stratification 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (6)
作者:  Kumar, Nirnimesh;  Feddersen, Falk
收藏  |  浏览/下载:11/0  |  提交时间:2019/04/09
larval transport  cross-shore exchange  transient rip currents  early-stage larvae  shoreline pollution  
Larvae drift simulations of the Pacific oyster in Skagerrak - influence of climate change on larvae development, survival and dispersal 科技报告
来源:Center for International Climate and Environmental Research-Oslo (CICERO). 出版年: 2016
作者:  Rinde, Eli;  Hjermann, Dag Øystein;  Staalstrøm, Andre
收藏  |  浏览/下载:14/0  |  提交时间:2019/04/05
VDP::Matematikk og naturvitenskap: 400  VDP::Mathematics and natural scienses: 400  Klimaendringer / Climate change  Larvespredning / Larvae dispersal  Stillehavsøsters / Crassostrea gigas  Strømmodellering / Water current modelling