Most of our daily decisions are governed by one of two systems: an impulsive system driving instantaneous decisions and a deliberative system driving thoughtful ones. The impulsive system reacts to immediately available concrete rewards. In contrast, the deliberative system reacts to more delayed rewards and/or punishments, which imposes consideration of longer-term choice consequences. Contingency management for addiction treatment is hypothesized to engage deliberative processes. Ultimately, in both decision-making situations, an action is needed to enact the decision. Whether those actions differ in implementation is an open question whose answer could inform as to whether distinct neural systems are engaged. To explore whether there is evidence of separate mechanisms between deliberated and immediate choices, we trained monkeys to perform a decision-making task where they made a choice on a touch screen between two visual cues predicting different amounts of reward. In immediate choice (IC) trials, the cues appeared at the final response locations where subjects could immediately touch the chosen cue. In deliberated choice (DC) trials, compound cues appeared orthogonally to the response locations. After a delay, allowing for decision formation, an identifying cue component was displaced to the randomly assigned response locations, permitting subjects to reach for the chosen cue. Both trial types showed an effect of cue value on cue selection time. However, only IC trials showed an effect of the competing cue on response vigor (measured by movement duration) and a reach trajectory that deviated in the direction of the competing cue, suggesting a decision reexamination process. Reward modulation of response vigor implicates dopaminergic mechanisms. In DC trials, reach trajectories revealed a commitment to the chosen choice target, and reach vigor was not modulated by the value of the competing cue. Our results suggest that choice-action dynamics are shaped by competing offers only during instantaneous, impulsive choice. After a deliberated decision, choice-action dynamics are unaffected by the alternative offer cue, demonstrating a commitment to the choice. The potential relevance to contingency management is discussed.
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http://dx.doi.org/10.3389/fnbeh.2021.674169 | DOI Listing |
ACS Nano
January 2025
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
Under a changing climate, enhancing the drought resilience of crops is critical to maintaining agricultural production and reducing food insecurity. Here, we demonstrate that seed priming with amorphous silica (SiO) nanoparticles (NPs) (20 mg/L) accelerated seed germination speed, increased seedlings vigor, and promoted seedling growth of rice under polyethylene glycol (PEG)-mimicking drought conditions. An orthogonal approach was used to uncover the mechanisms of accelerated seed germination and enhanced drought tolerance, including electron paramagnetic resonance, Fourier transform infrared spectroscopy (FTIR), metabolomics, and transcriptomics.
View Article and Find Full Text PDFPlant Mol Biol
January 2025
College of Agronomy, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
The lipoxygenase (LOX) gene family is widely distributed in plants, and its activity is closely associated with seed viability and stress tolerance. In this study, we cloned the rice(Oryza sativa)lipoxygenase gene OsLOX1, a key participant in the 13-lipoxygenase metabolic pathway. Our primary focus was to investigate its role in mediating responses to drought stress and seed germination in rice.
View Article and Find Full Text PDFNutr Metab Cardiovasc Dis
December 2024
Department of Basic Medical Sciences, Faculty of Medicine and Health Sciences, Rovira i Virgili University, Escorxador, 43003, Reus, Spain. Electronic address:
Beckground And Aims: Individuals with a higher body fat percentage may have higher serum levels of caffeine and its metabolites and process caffeine more slowly than individuals with a lower body fat percentage, so the aim of this study is to compare the occurrence of positive and negative effects of caffeine in nonobese and obese women.
Methods And Results: One hundred and sixty women were included in the study. Body fat was determined using the mBCA 515 SECA analyzer.
J Hazard Mater
December 2024
Natural Products Research Center of Guizhou Province, Guiyang, China; Guizhou Medical University Key Laboratory of Chemistry for Natural Products, Guiyang, China. Electronic address:
The eco-stoichiometry of Ca/Cd in soil significantly affects Cd uptake and accumulation by plants in carbonate regions. In this study, the physiological responses and detoxification mechanisms of Capsicum annuum L. (capsicum) were investigated based on the eco-stoichiometric relationship of Ca/Cd in production substrates under varying pH levels (5, 6, and 7).
View Article and Find Full Text PDFMol Hortic
January 2025
State Key Laboratory for Crop Stress Resistance and High-Efficiency Production, College of Horticulture, Northwest A&F University, Yangling, Shaanxi, China.
Grapevine is an important economic fruit tree worldwide, but grape production has been plagued by a vast number of fungal diseases, which affect tree vigor and the quality and yield of berries. To seek remedies for such issues, researchers have always been committed to conventional and biotechnological breeding. In recent years, increasing progress has been made in elucidating the molecular mechanisms of grape-pathogenic fungi interactions and resistance regulation.
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