甲基酸盐对强化延迟,大小和概率的敏感性的影响:冲动和风险选择的影响
Jeremy S Langford1,2, Sydney R Batchelder1,3, Christine E Hughes1
1Department of Psychology, University of North Carolina Wilmington, Wilmington, NC, USA.
Journal of the experimental analysis of behavior
|January 27, 2025
概括
甲基化物降低了子对延迟折扣和概率折扣任务中强化变化的敏感性. 这种效应与基线敏感性有关,这表明药物对冲动选择的影响的潜在预测因素.
科学领域:
- 行为药理学行为药理学
- 决策研究 决策研究
- 选择行为动物模型.
背景情况:
- 精神运动兴奋剂通常会降低对并发链任务中强化变化的敏感性.
- 了解药物如何影响选择行为对于治疗涉及冲动和风险决策的疾病至关重要.
研究的目的:
- 在延迟折扣和概率折扣的条件下,研究甲基酸对子选择行为的影响.
- 为了确定甲基胺是否会改变对不同强化维度 (延迟,大小,概率) 的敏感性.
主要方法:
- 子完成了并发链选择任务,涉及加强延迟/大小和概率/大小之间的权衡.
- 甲基酸盐的剂量没有显著改变整体反应率或偏差.
- 通过分析响应分配来量化对强化尺寸变化的敏感性.
主要成果:
- 甲基酸盐降低了对延迟,大小和强化概率维度的敏感性.
- 药物对敏感性的影响与延迟和大小的基线敏感性相关,但不是概率.
- 响应分配表明每个强化维度对选择的附加和独立贡献.
结论:
- 甲基酸盐通过降低对强化变量的敏感性来影响决策,特别是在延迟折扣 (冲动选择) 中.
- 基线灵敏度可以更可靠地预测药物对冲动选择的影响,而不是对风险选择的影响.
- 这些发现有助于理解决策的基础的神经生物学机制和精神刺激剂的影响.
相关概念视频
01:30Attention-Deficit/Hyperactivity Disorder
36
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings....
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings....
36
01:08Timing and Consequences on Behavior
77
In operant conditioning, the timing of reinforcement is crucial. For animals like rats and cats, immediate reinforcement (within a few seconds) is much more effective than delayed reinforcement. For example, a food reward for a rat needs to follow within 30 seconds of pressing a bar to be effective.
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant...
Humans, however, can respond to delayed reinforcers. We often make decisions between immediate small rewards and delayed larger rewards. This ability to delay gratification is a significant...
77
01:20Desensitization and Tachyphylaxis
1.5K
Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
1.5K
01:29Drugs Affecting Neurotransmitter Synthesis
1.2K
Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase,...
1.2K
01:21Drugs Affecting Neurotransmitter Release or Uptake
929
Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
929
01:25Adrenergic Agonists: Indirect-Acting Agents
1.5K
Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral...
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral...
1.5K