Quantifying harmony between direct and indirect pathways in the basal ganglia: healthy and Parkinsonian states

IF 3.1 3区 工程技术 Q2 NEUROSCIENCES
Sang-Yoon Kim, Woochang Lim
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Abstract

The basal ganglia (BG) show a variety of functions for motor and cognition. There are two competitive pathways in the BG; direct pathway (DP) which facilitates movement and indirect pathway (IP) which suppresses movement. It is well known that diverse functions of the BG may be made through “balance” between DP and IP. But, to the best of our knowledge, so far no quantitative analysis for such balance was done. In this paper, as a first time, we introduce the competition degree \({{\mathcal {C}}}_d\) between DP and IP. Then, by employing \({{\mathcal {C}}}_d\), we quantify their competitive harmony (i.e., competition and cooperative interplay), which could lead to improving our understanding of the traditional “balance” so clearly and quantitatively. We first consider the case of normal dopamine (DA) level of \(\phi ^*=0.3\). In the case of phasic cortical input (10 Hz), a healthy state with \({{\mathcal {C}}}_d^* = 2.82\) (i.e., DP is 2.82 times stronger than IP) appears. In this case, normal movement occurs via harmony between DP and IP. Next, we consider the case of decreased DA level, \(\phi = \phi ^*(=0.3)~x_{DA}\) (\(1 > x_{DA} \ge 0\)). With decreasing \(x_{DA}\) from 1, the competition degree \({{\mathcal {C}}}_d\) between DP and IP decreases monotonically from \({{\mathcal {C}}}_d^*\), which results in appearance of a pathological Parkinsonian state with reduced \({{\mathcal {C}}}_d\). In this Parkinsonian state, strength of IP is much increased than that in the case of normal healthy state, leading to disharmony between DP and IP. Due to such break-up of harmony between DP and IP, impaired movement occurs. Finally, we also study treatment of the pathological Parkinsonian state via recovery of harmony between DP and IP.

Abstract Image

量化基底神经节直接和间接通路之间的协调性:健康状态和帕金森病状态
基底神经节(BG)在运动和认知方面具有多种功能。基底节有两条竞争性通路:促进运动的直接通路(DP)和抑制运动的间接通路(IP)。众所周知,BG 的各种功能可能是通过 DP 和 IP 之间的 "平衡 "实现的。但是,据我们所知,迄今为止还没有对这种平衡进行过定量分析。本文首次引入了 DP 和 IP 之间的竞争度({{\mathcal {C}}_d\ )。然后,通过使用 \({{\mathcal {C}}}_d\) 来量化它们之间的竞争和谐性(即竞争与合作的相互作用),这将有助于我们更清晰、更定量地理解传统的 "平衡"。我们首先考虑多巴胺(DA)水平正常的情况(\phi ^*=0.3\)。在大脑皮层相位输入(10 Hz)的情况下,会出现一个健康的状态,即 \({{\mathcal {C}}}_d^* = 2.82\) (即 DP 比 IP 强 2.82 倍)。在这种情况下,正常运动是通过 DP 和 IP 之间的协调来实现的。接下来,我们考虑DA水平下降的情况,\(\phi = \phi ^*(=0.3)~x_{DA}\) (\(1 > x_{DA} \ge 0\)).随着 \(x_{DA}\) 从 1 开始递减,DP 和 IP 之间的竞争程度 \({{\mathcal {C}}}_d^*\) 从 \({{\mathcal {C}}}_d^*\) 开始单调递减,这导致了帕金森病理状态的出现,同时 \({{\mathcal {C}}}_d\) 减少。在这种帕金森状态下,IP 的强度远高于正常健康状态下的强度,从而导致 DP 和 IP 之间的不和谐。由于 DP 和 IP 之间的和谐被打破,运动就会受损。最后,我们还研究了通过恢复 DP 和 IP 之间的和谐来治疗病理性帕金森状态。
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来源期刊
Cognitive Neurodynamics
Cognitive Neurodynamics 医学-神经科学
CiteScore
6.90
自引率
18.90%
发文量
140
审稿时长
12 months
期刊介绍: Cognitive Neurodynamics provides a unique forum of communication and cooperation for scientists and engineers working in the field of cognitive neurodynamics, intelligent science and applications, bridging the gap between theory and application, without any preference for pure theoretical, experimental or computational models. The emphasis is to publish original models of cognitive neurodynamics, novel computational theories and experimental results. In particular, intelligent science inspired by cognitive neuroscience and neurodynamics is also very welcome. The scope of Cognitive Neurodynamics covers cognitive neuroscience, neural computation based on dynamics, computer science, intelligent science as well as their interdisciplinary applications in the natural and engineering sciences. Papers that are appropriate for non-specialist readers are encouraged. 1. There is no page limit for manuscripts submitted to Cognitive Neurodynamics. Research papers should clearly represent an important advance of especially broad interest to researchers and technologists in neuroscience, biophysics, BCI, neural computer and intelligent robotics. 2. Cognitive Neurodynamics also welcomes brief communications: short papers reporting results that are of genuinely broad interest but that for one reason and another do not make a sufficiently complete story to justify a full article publication. Brief Communications should consist of approximately four manuscript pages. 3. Cognitive Neurodynamics publishes review articles in which a specific field is reviewed through an exhaustive literature survey. There are no restrictions on the number of pages. Review articles are usually invited, but submitted reviews will also be considered.
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