Current research in neurobiology最新文献

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Entorhinal-hippocampal interactions lead to globally coherent representations of space 内嗅-海马体的相互作用导致空间的全局连贯表征
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100035
Taiping Zeng , Bailu Si , Xiaoli Li
{"title":"Entorhinal-hippocampal interactions lead to globally coherent representations of space","authors":"Taiping Zeng ,&nbsp;Bailu Si ,&nbsp;Xiaoli Li","doi":"10.1016/j.crneur.2022.100035","DOIUrl":"10.1016/j.crneur.2022.100035","url":null,"abstract":"<div><p>The firing maps of grid cells in the entorhinal cortex are thought to provide an efficient metric system capable of supporting spatial inference in all environments. However, whether spatial representations of grid cells are determined by local environment cues or are organized into globally coherent patterns remains undetermined. We propose a navigation model containing a path integration system in the entorhinal cortex and a cognitive map system in the hippocampus. In the path integration system, grid cell network and head direction (HD) cell network integrate movement and visual information, and form attractor states to represent the positions and head directions of the animal. In the cognitive map system, a topological map is constructed capturing the attractor states of the path integration system as nodes and the transitions between attractor states as links. On loop closure, when the animal revisits a familiar place, the topological map is calibrated to minimize odometry errors. The change of the topological map is mapped back to the path integration system, to correct the states of the grid cells and the HD cells. The proposed model was tested on iRat, a rat-like miniature robot, in a realistic maze. Experimental results showed that, after familiarization of the environment, both grid cells and HD cells develop globally coherent firing maps by map calibration and activity correction. These results demonstrate that the hippocampus and the entorhinal cortex work together to form globally coherent metric representations of the environment. The underlying mechanisms of the hippocampal-entorhinal circuit in capturing the structure of the environment from sequences of experience are critical for understanding episodic memory.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100035"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/ae/5a/main.PMC9846457.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10581804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A mind in motion: Exercise improves cognitive flexibility, impulsivity and alters dopamine receptor gene expression in a Parkinsonian rat model 运动中的思维:在帕金森大鼠模型中,锻炼可以提高认知灵活性、冲动性和改变多巴胺受体基因表达
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100039
Wang Zhuo , Adam J. Lundquist , Erin K. Donahue , Yumei Guo , Derek Phillips , Giselle M. Petzinger , Michael W. Jakowec , Daniel P. Holschneider
{"title":"A mind in motion: Exercise improves cognitive flexibility, impulsivity and alters dopamine receptor gene expression in a Parkinsonian rat model","authors":"Wang Zhuo ,&nbsp;Adam J. Lundquist ,&nbsp;Erin K. Donahue ,&nbsp;Yumei Guo ,&nbsp;Derek Phillips ,&nbsp;Giselle M. Petzinger ,&nbsp;Michael W. Jakowec ,&nbsp;Daniel P. Holschneider","doi":"10.1016/j.crneur.2022.100039","DOIUrl":"10.1016/j.crneur.2022.100039","url":null,"abstract":"<div><p>Cognitive impairment, particularly deficits in executive function (EF) is common in Parkinson's disease (PD) and may lead to dementia. There are currently no effective treatments for cognitive impairment. Work from our lab and others has shown that physical exercise may improve motor performance in PD but its role in cognitive function remains poorly eludicated. In this study in a rodent model of PD, we sought to examine whether exercise improves cognitive processing and flexibility, important features of EF. Rats received 6-hydroxydopamine lesions of the bilateral striatum (caudate-putamen, CPu), specifically the dorsomedial CPu, a brain region central to EF. Rats were exercised on motorized running wheels or horizontal treadmills for 6–12 weeks. EF-related behaviors including attention and processing, as well as flexibility (inhibition) were evaluated using either an operant 3-choice serial reaction time task (3-CSRT) with rule reversal (3-CSRT-R), or a T-maze task with reversal. Changes in striatal transcript expression of dopamine receptors (<em>Drd1-4</em>) and synaptic proteins (<em>Synaptophysin, PSD-95)</em> were separately examined following 4 weeks of exercise in a subset of rats. Exercise/Lesion rats showed a modest, yet significant improvement in processing-related response accuracy in the 3-CSRT-R and T-maze, as well as a significant improvement in cognitive flexibility as assessed by inhibitory aptitude in the 3-CSRT-R. By four weeks, exercise also elicited increased expression of <em>Drd1</em>, <em>Drd3</em>, <em>Drd4, synaptophysin, and PSD-95</em> in the dorsomedial and dorsolateral CPu. Our results underscore the observation that exercise, in addition to improving motor function may benefit cognitive performance, specifically EF, and that early changes (by 4 weeks) in CPu dopamine modulation and synaptic connectivity may underlie these benefits.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100039"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/39/00/main.PMC9743054.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10353943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Microstructural interactions contribute to the hotspot in the living cochlea 微观结构的相互作用促成了活体耳蜗的热点
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100045
Junpei Liu , Yanru Bai , Qianli Cheng , Shu Zheng , Stephen Elliott , Guangjian Ni
{"title":"Microstructural interactions contribute to the hotspot in the living cochlea","authors":"Junpei Liu ,&nbsp;Yanru Bai ,&nbsp;Qianli Cheng ,&nbsp;Shu Zheng ,&nbsp;Stephen Elliott ,&nbsp;Guangjian Ni","doi":"10.1016/j.crneur.2022.100045","DOIUrl":"10.1016/j.crneur.2022.100045","url":null,"abstract":"<div><p>The mechanism of the active cochlea relies on a complex interaction between microstructures in the organ of Corti. A significant longitudinal vibration “hotspot” was recently observed in the high-frequency region of the living gerbil cochlea between the Deiters cells and the outer hair cells. A similar phenomenon was also found in guinea pigs with a relatively smaller magnitude. The cause is unknown, but one hypothesis is that this phenomenon is due to the structural constraints between different microstructures. It is not easy to explain the mechanism of hotspots directly from experimental observations. It may also be difficult to image or test if the hotspot will occur in the low-frequency region in the cochlea. We built two three-dimensional finite element models corresponding to the high- and low-frequency regions in the guinea pig cochlea. Responses of the organ of Corti to passive acoustic and outer hair cell electrical excitation were calculated. The two excitations were then superimposed to predict the active response of the organ of Corti. The hotspot phenomenon in the experiment was reproduced and analyzed in-depth about influencing factors. Our results indicate that hotspots appear in the low-frequency region of the cochlea as well. We hypothesize that the hotspot is a locally originated phenomenon in the cochlea, and the traveling wave further enhances the response to low-frequency excitation. The movement of outer hair cells inclined in the longitudinal direction is the leading cause of the hotspot.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100045"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/1f/3d/main.PMC9743062.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10361739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Electrophysiological differences and similarities in audiovisual speech processing in CI users with unilateral and bilateral hearing loss 单侧和双侧听力损失的CI使用者视听语音处理的电生理差异和相似之处
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100059
Natalie Layer , Anna Weglage , Verena Müller , Hartmut Meister , Ruth Lang-Roth , Martin Walger , Micah M. Murray , Pascale Sandmann
{"title":"Electrophysiological differences and similarities in audiovisual speech processing in CI users with unilateral and bilateral hearing loss","authors":"Natalie Layer ,&nbsp;Anna Weglage ,&nbsp;Verena Müller ,&nbsp;Hartmut Meister ,&nbsp;Ruth Lang-Roth ,&nbsp;Martin Walger ,&nbsp;Micah M. Murray ,&nbsp;Pascale Sandmann","doi":"10.1016/j.crneur.2022.100059","DOIUrl":"10.1016/j.crneur.2022.100059","url":null,"abstract":"<div><p>Hearing with a cochlear implant (CI) is limited compared to natural hearing. Although CI users may develop compensatory strategies, it is currently unknown whether these extend from auditory to visual functions, and whether compensatory strategies vary between different CI user groups. To better understand the experience-dependent contributions to multisensory plasticity in audiovisual speech perception, the current event-related potential (ERP) study presented syllables in auditory, visual, and audiovisual conditions to CI users with unilateral or bilateral hearing loss, as well as to normal-hearing (NH) controls. Behavioural results revealed shorter audiovisual response times compared to unisensory conditions for all groups. Multisensory integration was confirmed by electrical neuroimaging, including topographic and ERP source analysis, showing a visual modulation of the auditory-cortex response at N1 and P2 latency. However, CI users with bilateral hearing loss showed a distinct pattern of N1 topography, indicating a stronger visual impact on auditory speech processing compared to CI users with unilateral hearing loss and NH listeners. Furthermore, both CI user groups showed a delayed auditory-cortex activation and an additional recruitment of the visual cortex, and a better lip-reading ability compared to NH listeners. In sum, these results extend previous findings by showing distinct multisensory processes not only between NH listeners and CI users in general, but even between CI users with unilateral and bilateral hearing loss. However, the comparably enhanced lip-reading ability and visual-cortex activation in both CI user groups suggest that these visual improvements are evident regardless of the hearing status of the contralateral ear.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100059"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/7e/fa/main.PMC9672392.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40698128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Potential role of IGF-1/GLP-1 signaling activation in intracerebral hemorrhage IGF-1/GLP-1信号激活在脑出血中的潜在作用
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100055
Ehraz Mehmood Siddiqui, Sidharth Mehan, Sonalika Bhalla, Ambika Shandilya
{"title":"Potential role of IGF-1/GLP-1 signaling activation in intracerebral hemorrhage","authors":"Ehraz Mehmood Siddiqui,&nbsp;Sidharth Mehan,&nbsp;Sonalika Bhalla,&nbsp;Ambika Shandilya","doi":"10.1016/j.crneur.2022.100055","DOIUrl":"10.1016/j.crneur.2022.100055","url":null,"abstract":"<div><p>IGF-1 and GLP-1 receptors are essential in all tissues, facilitating defense by upregulating anabolic processes. They are abundantly distributed throughout the central nervous system, promoting neuronal proliferation, survival, and differentiation. IGF-1/GLP-1 is a growth factor that stimulates neurons' development, reorganization, myelination, and survival. In primary and secondary brain injury, the IGF-1/GLP-1 receptors are impaired, resulting in further neuro complications such as cerebral tissue degradation, neuroinflammation, oxidative stress, and atrophy. Intracerebral hemorrhage (ICH) is a severe condition caused by a stroke for which there is currently no effective treatment. While some pre-clinical studies and medications are being developed as symptomatic therapies in clinical trials, there are specific pharmacological implications for improving post-operative conditions in patients with intensive treatment. Identifying the underlying molecular process and recognizing the worsening situation can assist researchers in developing effective therapeutic solutions to prevent post-hemorrhagic symptoms and the associated neural dysfunctions. As a result, in the current review, we have addressed the manifestations of the disease that are aggravated by the downregulation of IGF-1 and GLP-1 receptors, which can lead to ICH or other neurodegenerative disorders. Our review summarizes that IGF-1/GLP-1 activators may be useful for treating ICH and its related neurodegeneration.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100055"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/fc/c3/main.PMC9846475.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10586919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigating effortful speech perception using fNIRS and pupillometry measures 使用近红外光谱(fNIRS)和瞳孔测量法研究费力语音感知
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100052
Xin Zhou , Emily Burg , Alan Kan , Ruth Y. Litovsky
{"title":"Investigating effortful speech perception using fNIRS and pupillometry measures","authors":"Xin Zhou ,&nbsp;Emily Burg ,&nbsp;Alan Kan ,&nbsp;Ruth Y. Litovsky","doi":"10.1016/j.crneur.2022.100052","DOIUrl":"10.1016/j.crneur.2022.100052","url":null,"abstract":"<div><p>The current study examined the neural mechanisms for mental effort and its correlation to speech perception using functional near-infrared spectroscopy (fNIRS) in listeners with normal hearing (NH). Data were collected while participants listened and responded to unprocessed and degraded sentences, where words were presented in grammatically correct or shuffled order. Effortful listening and task difficulty due to stimulus manipulations was confirmed using a subjective questionnaire and a well-established objective measure of mental effort – pupillometry. fNIRS measures focused on cortical responses in two <em>a priori</em> regions of interest, the left auditory cortex (AC) and lateral frontal cortex (LFC), which are closely related to auditory speech perception and listening effort, respectively. We examined the relations between the two objective measures and behavioral measures of speech perception (task performance) and task difficulty.</p></div><div><h3>Results</h3><p>demonstrated that changes in pupil dilation were positively correlated with the self-reported task difficulty levels and negatively correlated with the task performance scores. A significant and negative correlation between the two behavioral measures was also found. That is, as perceived task demands increased and task performance scores decreased, pupils dilated more. fNIRS measures (cerebral oxygenation) in the left AC and LFC were both negatively correlated with the self-reported task difficulty levels and positively correlated with task performance scores. These results suggest that pupillometry measures can indicate task demands and listening effort; whereas, fNIRS measures using a similar paradigm seem to reflect speech processing, but not effort.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100052"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/c3/4a/main.PMC9743070.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10156109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Understanding them to understand ourselves: The importance of NHP research for translational neuroscience 了解它们,了解我们自己:NHP研究对转化神经科学的重要性
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100049
Annabella Lear , Stuart N. Baker , Hannah F. Clarke , Angela C. Roberts , Michael C. Schmid , Wendy Jarrett
{"title":"Understanding them to understand ourselves: The importance of NHP research for translational neuroscience","authors":"Annabella Lear ,&nbsp;Stuart N. Baker ,&nbsp;Hannah F. Clarke ,&nbsp;Angela C. Roberts ,&nbsp;Michael C. Schmid ,&nbsp;Wendy Jarrett","doi":"10.1016/j.crneur.2022.100049","DOIUrl":"10.1016/j.crneur.2022.100049","url":null,"abstract":"<div><p>Studying higher brain function presents fundamental scientific challenges but has great potential for impactful translation to the clinic, supporting the needs of many patients suffering from conditions that relate to neuronal dysfunction. For many key questions relevant to human neurological conditions and clinical interventions, non-human primates (NHPs) remain the only suitable model organism and the only effective way to study the relationship between brain structure and function with the knowledge and tools currently available. Here we present three exemplary studies of current research yielding important findings that are directly translational to human clinical patients but which would be impossible without NHP studies. Our first example shows how studies of the NHP prefrontal cortex are leading to clinically relevant advances and potential new treatments for human neuropsychiatric disorders such as depression and anxiety. Our second example looks at the relevance of NHP research to our understanding of visual pathways and the visual cortex, leading to visual prostheses that offer treatments for otherwise blind patients. Finally, we consider recent advances in treatments leading to improved recovery of movement and motor control in stroke patients, resulting from our improved understanding of brain stem parallel pathways involved in movement in NHPs. The case for using NHPs in neuroscience research, and the direct benefits to human patients, is strong but has rarely been set out directly. This paper reviews three very different areas of neuroscience research, expressly highlighting the unique insights offered to each by NHP studies and their direct applicability to human clinical conditions.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100049"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9743051/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9462239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Beyond mindfulness: Arousal-driven modulation of attentional control during arousal-based practices 超越正念:在基于唤醒的练习中,唤醒驱动的注意控制调制
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100053
Maria Kozhevnikov , Alina Veronika Irene Strasser , Elizabeth McDougal , Rupali Dhond , Geoffrey Samuel
{"title":"Beyond mindfulness: Arousal-driven modulation of attentional control during arousal-based practices","authors":"Maria Kozhevnikov ,&nbsp;Alina Veronika Irene Strasser ,&nbsp;Elizabeth McDougal ,&nbsp;Rupali Dhond ,&nbsp;Geoffrey Samuel","doi":"10.1016/j.crneur.2022.100053","DOIUrl":"10.1016/j.crneur.2022.100053","url":null,"abstract":"<div><p>Here we report meditative techniques, which modulate attentional control by arousal-driven influences and not by monitoring continuous thought processes as during mindfulness-related practices. We focus on Vajrayana (Tantric Buddhism) practices, during which a sequence of generation (self-visualization as a deity - Yidam) or completion with sign (inner heat -Tummo) stages necessarily precedes non-dual awareness (NDA) Tantric Mahamudra. We compared the electrocardiographic and electroencephalographic correlates of Mahamudra performed after rest (non-Tantric Mahamudra) with Mahamudra performed after Yidam (Tantric Mahamudra) in 16 highly experienced Vajrayana practitioners, 10 of whom also performed Tummo. Both Yidam and Tummo developed the state of PNS withdrawal (arousal) and phasic alertness, as reflected by HF HRV decreases and Alpha2 power increases, later neurophysiologically employed in Tantric Mahamudra. The latter led to the unique state of high cortical excitability, “non-selective” focused attention, and significantly reduced attentional control, quantified by power reductions in all frequency bands, except Theta. In contrast, similar to mindfulness-related practices, non-Tantric Mahamudra was performed in a state of PNS dominance (relaxation), tonic alertness, and active monitoring, as suggested by Alpha1 power increases and less pronounced decreases in other frequency bands. A neurobiological model of meditation is proposed, differentiating arousal-based and mindfulness-related practices.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100053"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/8f/01/main.PMC9559070.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33513956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Phylogenetic view of the compensatory mechanisms in motor and sensory systems after neuronal injury 神经元损伤后运动和感觉系统代偿机制的系统发育观点
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100058
Tadashi Isa , Takamichi Tohyama , Masaharu Kinoshita
{"title":"Phylogenetic view of the compensatory mechanisms in motor and sensory systems after neuronal injury","authors":"Tadashi Isa ,&nbsp;Takamichi Tohyama ,&nbsp;Masaharu Kinoshita","doi":"10.1016/j.crneur.2022.100058","DOIUrl":"10.1016/j.crneur.2022.100058","url":null,"abstract":"<div><p>Through phylogeny, novel neural circuits are added on top of ancient circuits. Upon injury of a novel circuit which enabled fine control, the ancient circuits can sometimes take over its function for recovery; however, the recovered function is limited according to the capacity of the ancient circuits. In this review, we discuss two examples of functional recovery after neural injury in nonhuman primate models. The first is the recovery of dexterous hand movements following damage to the corticospinal tract. The second is the recovery of visual function after injury to the primary visual cortex (V1). In the former case, the functions of the direct cortico-motoneuronal pathway, which specifically developed in higher primates for the control of fractionated digit movements, can be partly compensated for by other descending motor pathways mediated by rubrospinal, reticulospinal, and propriospinal neurons. However, the extent of recovery depends on the location of the damage and which motor systems take over its function. In the latter case, after damage to V1, which is highly developed in primates, either the direct pathway from the lateral geniculate nucleus to extrastriate visual cortices or that from the midbrain superior colliculus–pulvinar–extrastriate/parietal cortices partly takes over the function of V1. However, the state of visual awareness is no longer the same as in the intact state, which might reflect the limited capacity of the compensatory pathways in visual recognition. Such information is valuable for determining the targets of neuromodulatory therapies and setting treatment goals after brain and spinal cord injuries.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100058"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/db/48/main.PMC9593282.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40668329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The mediodorsal thalamus supports adaptive responding based on stimulus-outcome associations 丘脑中背侧支持基于刺激-结果关联的适应性反应
Current research in neurobiology Pub Date : 2022-01-01 DOI: 10.1016/j.crneur.2022.100057
Sarah Morceau, Angélique Faugère, Etienne Coutureau, Mathieu Wolff
{"title":"The mediodorsal thalamus supports adaptive responding based on stimulus-outcome associations","authors":"Sarah Morceau,&nbsp;Angélique Faugère,&nbsp;Etienne Coutureau,&nbsp;Mathieu Wolff","doi":"10.1016/j.crneur.2022.100057","DOIUrl":"10.1016/j.crneur.2022.100057","url":null,"abstract":"<div><p>The ability to engage into flexible behaviors is crucial in dynamic environments. We recently showed that in addition to the well described role of the orbitofrontal cortex (OFC), its thalamic input from the submedius thalamic nucleus (Sub) also contributes to adaptive responding during Pavlovian degradation. In the present study, we examined the role of the mediodorsal thalamus (MD) which is the other main thalamic input to the OFC. To this end, we assessed the effect of both pre- and post-training MD lesions in rats performing a Pavlovian contingency degradation task. Pre-training lesions mildly impeded the establishment of stimulus-outcome associations during the initial training of Pavlovian conditioning without interfering with Pavlovian degradation training when the sensory feedback provided by the outcome rewards were available to animals. However, we found that both pre- and post-training MD lesions produced a selective impairment during a test conducted under extinction conditions, during which only current mental representation could guide behavior. Altogether, these data suggest a role for the MD in the successful encoding and representation of Pavlovian associations.</p></div>","PeriodicalId":72752,"journal":{"name":"Current research in neurobiology","volume":"3 ","pages":"Article 100057"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/26/e1/main.PMC9587292.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40568913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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