Somatosensory & motor research最新文献

{"title":"Distribution of perineuronal nets in the adult rat neocortex.","authors":"Kumarie Budhu, Harold Gomes, Yakubmier Borukhov, Philip Chu, Joshua C Brumberg","doi":"10.1080/08990220.2025.2476945","DOIUrl":"https://doi.org/10.1080/08990220.2025.2476945","url":null,"abstract":"<p><p>Perineuronal nets (PNNs) are specialised extracellular matrix structures of the central nervous system that predominantly surround inhibitory interneurons. The development of PNNs is activity dependent and relies on sensory input to mature to an adult expression pattern, coinciding with the crysallization of synaptic circuitry following the closure of the developmental critical period. Our results of a neocortical characterisation demonstrate that the density of PNNs in the neocortex of the Long Evans rat was consistent across animals but varied as a function of the cortical region. Utilising a non-biased random effect model, it was shown that the retrosplenial granular cortex had the highest PNN density and the intermediate endopiriform cortex had the lowest. Given the importance of mystacial vibrissae to the behaviour of rodents, we further analysed the laminar distribution of PNNs within the primary somatosensory cortex (S1). Our results revealed that the layer IV, the 'barrel' region, contained the highest density of PNNs. Within S1, PNN density was consistent across all subregions. S1 had a significantly higher density of PNNs compared with the primary motor (M1) cortex, and PNN levels did not show lateralisation in either M1 or S1. Independent of cortical location, we observed a novel class of relatively large, brightly stained neurons ensheathed by PNNs, which were present exclusively along the layer VI-white matter border. A better understanding of PNNs and their distribution can assist in our understanding of how PNN manipulation can affect neurological conditions such as schizophrenia, epilepsy, stroke, central nervous system injuries, and degenerative processes.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"1-16"},"PeriodicalIF":0.0,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143607608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of transcranial direct current stimulation on motor learning in healthy elderly individuals: a systematic review and meta-analysis.","authors":"Fusheng Zhang, Yanbai Han, Hongli Wang, Yong Li, Dingyu Tang","doi":"10.1080/08990220.2024.2310851","DOIUrl":"10.1080/08990220.2024.2310851","url":null,"abstract":"<p><strong>Background: </strong>Transcranial direct current stimulation (tDCS) is widely used in motor recovery. Nevertheless, whether tDCS improves motor learning in healthy older adults is still controversial. This review aims to investigate the effectiveness of tDCS on motor learning in healthy elderly individuals.</p><p><strong>Methods: </strong>The PubMed, Cochrane Library, Web of Science and Embase databases were initially searched from inception to December 5, 2022. The standard mean difference (SMD) with the corresponding 95% confidence intervals (CIs) were analysed <i>via</i> random-effect models.</p><p><strong>Results: </strong>Compared with the sham group, no significant effects were found regarding improvement in motor learning based on the speed or accuracy of the task and reaction time for the tDCS intervention group. After subgroup analysis, a significant effect was found for improved motor learning based on reaction time in the primary motor cortex (M1)-cerebellar group.</p><p><strong>Conclusions: </strong>This review revealed that tDCS had no significant effect on improving the speed or accuracy of motor learning in healthy elderly adults. However, it has a significant effect on improving the motor learning ability based on the reaction time of the task (mainly referring to the tDCS stimulation position of M1 and cerebellar), although the results have obvious heterogeneity and uncertainty.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"17-27"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139693779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Counterirritation by pain inhibits the responsiveness to aversive loud tones: the role of state anxiety and state fear triggered in the NPU paradigm.","authors":"Silvia Metzger, Claudia Horn-Hofmann, Miriam Kunz, Stefan Lautenbacher","doi":"10.1080/08990220.2024.2322499","DOIUrl":"10.1080/08990220.2024.2322499","url":null,"abstract":"<p><strong>Aim of the study: </strong>The application of a noxious stimulus reduces the perception and responsiveness to other pain stimuli. This inhibition can be experimentally assessed with a method called 'counterirritation'. The question arises if counterirritation acts also on the perception and responsiveness to aversive but non-nociceptive stimuli (e.g., loud tones). Since aversive stimulation is often associated with state anxiety or state fear, we investigated in addition the modulatory effects of these emotions on counterirritation.</p><p><strong>Material and methods: </strong>51 subjects participated in our study. We presented tones with aversive loudness (105 dB), first alone then during counterirritation (immersion of the hand in a hot water bath of 46 °C) to assess inhibition of loudness perception and responsiveness. Influences of state anxiety and state fear on counterirritation were investigated by using the Neutral-Predictable(fear)- Unpredictable(anxiety) Paradigm (NPU), which is based on classical conditioning. Loudness ratings (perception of the aversive tones) and startle reflex (defensive reaction to aversive tones) were assessed.</p><p><strong>Results: </strong>Counterirritation reduced startle reflex amplitudes, but not the loudness ratings. Although state anxiety and state fear were successfully induced, counterirritation remained unaffected.</p><p><strong>Conclusions: </strong>Our study showed that pain inhibits the responsiveness to aversive stimuli (loud tones). Thus, the postulate that 'pain inhibits pain' might be better changed to 'pain inhibits aversiveness'. Consequently, our findings may also question the assumption of a clear pain specificity in inhibitory action as assumed by theoretical approaches like 'conditioned pain modulation' (CPM). Furthermore, counterirritation appeared one more time resistant to the influence of negative emotions.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"38-46"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140069042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Descending motor command to prime mover of dependent finger induces tactile gating in target and distant non-target finger.","authors":"Hitoshi Oda, Ryo Tsujinaka, Shiho Fukuda, Naoki Hamada, Masakazu Matsuoka, Koichi Hiraoka","doi":"10.1080/08990220.2024.2358298","DOIUrl":"10.1080/08990220.2024.2358298","url":null,"abstract":"<p><p>This study examined whether tactile gating induced by the descending motor command to one finger spreads out to the other fingers to which the command is not delivered and whether this gating is dependent on the target finger to which the command is delivered. The change in perceptual threshold to the digital nerve stimulation of one finger induced by tonic contraction of the first dorsal interosseous or abductor digiti minimi muscle was examined. The perceptual threshold to the digital nerve stimulation of the thumb or little finger was increased by tonic contraction of the abductor digiti minimi muscle. This finding indicates that the descending motor command to the prime mover of the little finger abduction induces tactile gating not only in the finger to which the command is delivered but also in the other finger to which the command is not delivered. Tonic contraction of the first dorsal interosseous muscle did not change the perceptual threshold to the digital nerve stimulation in any finger. This finding means that tactile gating occurs particularly when the descending motor command is delivered to the dependent finger. Spreading out of tactile gating of one finger, to which the descending motor command is not delivered, is likely mediated by surround inhibition.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"47-54"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141089551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Connectivity of neural signals to the primary motor area during preparatory periods for movement following external and internal cues.","authors":"Jumpei Kudo, Minoru Hoshiyama","doi":"10.1080/08990220.2024.2319592","DOIUrl":"10.1080/08990220.2024.2319592","url":null,"abstract":"<p><strong>Purpose: </strong>We investigated the connectivity of neural signals from movement-related cortical areas to the primary motor area (M1) in the hemisphere contralateral to the movement side during the period of movement-related magnetic fields before movement.</p><p><strong>Materials and methods: </strong>Participants were 13 healthy adults, and nerual signals were recorded using magnetoencephalography. Spontaneous extension of the right wrist was performed at the participant's own pace and following a visual cue in internal (IC) and external (EC) cue tasks. The connectivity of neural signals to M1 from each movement-related motor area was assessed by Granger causality analysis (GCA). The GCA was performed on the neural activity elicited in a frequency band between 7.8 and 46.9 Hz during the pre-movement periods, which occurred durng the readiness field (RF) and the negative slope prime (NSp). F-values, as connectivity values obtained by GCA, were compared between the EC and IC cue tasks.</p><p><strong>Results: </strong>For NSp periods, the connectivity of neural signals from the left superior frontal area (SF-L) to M1 was dominant in the IC task, whereas that from the left superior parietal area (SP-L) to M1 was dominant in the EC task. The F value in the GCA from SP-L to M1 was greater in the EC task during RF than in the IC task during equivalent periods.</p><p><strong>Conslusions: </strong>In the present study, there were differences in the connectivity of neural signals to M1 between IC and EC tasks. The present results suggested that the pattern of pre-movement neural activity that resulted in a movement was not uniform but differed between movement tasks just before the movement.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"28-37"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139975189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Differences in temporal profile of brain responses by pleasantness of somatosensory stimulation in autistic individuals.","authors":"Alisa R Zoltowski, Michelle D Failla, Jennifer M Quinde-Zlibut, Kacie Dunham-Carr, Estephan J Moana-Filho, Greg K Essick, Grace T Baranek, Baxter Rogers, Carissa J Cascio","doi":"10.1080/08990220.2023.2294715","DOIUrl":"10.1080/08990220.2023.2294715","url":null,"abstract":"<p><p><b>Purpose/Aim</b>. Autistic individuals may show either <i>hyper-</i> or <i>hypo-</i> responsiveness to touch compared to non-autistic individuals. These behavioural responses depend on perceptual and evaluative mechanisms, which unfold sequentially and thus can be distinguished by exploring the timing of neural responses. In this study, we examined neural response timing to pleasant, unpleasant, and affectively neutral textures, to determine whether these perceptual versus evaluative subprocesses differ in autism and how each subprocess contributes to behavioural responses.<b>Materials and Methods.</b> Our sample included <i>n</i> = 13 autistic and <i>n</i> = 14 non-autistic adults who completed functional magnetic resonance imaging. We analysed early, intermediate, and late phases of the tactile response, derived from studies of noxious tactile stimulation, to three different textures.<b>Results.</b> The autistic group showed distinct differences from the non-autistic group to each of the textures, showing earlier, somatosensory differences in response to the pleasantly and unpleasantly rated textures and later, frontomotor differences in response to the neutrally rated texture. Further, reduced early phase response to the pleasant texture correlated with increased sensory seeking behaviour.<b>Conclusions.</b> While preliminary, these results suggest distinct patterns between autistic and non-autistic individuals in how the neural response to touch unfolds and its correspondence with the perceived pleasantness of tactile experience. The findings suggest perceptual differences in response to affectively charged textures and evaluative differences in response to neutral, ambiguous textures. These temporal properties may inform future studies of tactile processing in autism, lending a better understanding of <i>how</i> individuals differ in their sensory experiences across contexts.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"1-16"},"PeriodicalIF":0.0,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11193842/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138886850","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}

{"title":"Between-day variability of soleus H reflex recruitment curve parameters: how many stimulations are required to maximise the reproducibility of the measurements?","authors":"André D Gonçalves, Beatriz Agostinho, Jorge Infante, Pedro Pezarat-Correia, Carolina Vila-Chã, Gonçalo V Mendonça","doi":"10.1080/08990220.2025.2458881","DOIUrl":"https://doi.org/10.1080/08990220.2025.2458881","url":null,"abstract":"<p><strong>Purpose: </strong>The H reflex recruitment curve represents the gold standard for quantifying changes in spinal circuitries. However, there is no agreement on how many stimulations should be applied for each parameter. Thus, we explored the impact of varying the number of stimulations (3, 6, 9, 12 and 15 stimuli per intensity) on between-day reliability of soleus H reflex.</p><p><strong>Materials and methods: </strong>Twenty healthy participants (11 males, 9 females; age: 22.4 ± 2.3 years) visited the laboratory on two days for H-recruitment curves construction, using a 3 s inter-stimuli interval. To explore whether H reflex parameters differed between days, without varying the number of stimulations, paired-sample <i>t</i> tests were performed. Relative and absolute reliability were calculated using the intraclass correlation coefficients (ICCs) and the coefficients of variation (CVs), respectively.</p><p><strong>Results: </strong>M_max, H_max/M_max, H slope, H_thresh, current at 50% of H_max and current at H_max were not significantly different between days (all <i>p</i> > 0.05). ICCs of M_max, H_max/M_max and H_thresh were all good (0.79-0.89). H slope ICCs were moderate (0.56-0.73) between 3 and 12, but good (0.75) with 15 stimulations. Current at H_max ICCs were moderate (0.55-0.0.73) with all stimulations, except with 9 (good: 0.76). CVs of the current at H_max were all moderate (between 5-to-10%). H_thresh CV was poor (>10%) with three, but moderate for other stimulations. M_max, H_max/M_max and H slope CVs were generally poor.</p><p><strong>Conclusions: </strong>9 stimulations are required to ensure higher between-day reliability of H reflex parameters, except for H slope that requires 15 stimulations.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143054760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual muscle tendon vibration does not impede performance of a goal-directed aiming task.","authors":"Niyousha Mortaza, Steven R Passmore, Katinka Stecina, Cheryl M Glazebrook","doi":"10.1080/08990220.2023.2272971","DOIUrl":"10.1080/08990220.2023.2272971","url":null,"abstract":"<p><strong>Aims: </strong>Application of muscle-tendon vibration within the frequency range of 70-120Hz has been studied as a tool to stimulate somatosensory afferents with both the goal of studying human sensorimotor control and of improving post-stroke motor performance. Specific to applications for rehabilitation, current evidence is mixed as to whether dual muscle-tendon vibration is detrimental to the performance of goal-directed upper-limb movements. The current study aimed to determine the effects of muscle-tendon vibration over the wrist flexors and extensors (dual vibration) on performance of a computer goal-directed aiming task.</p><p><strong>Methods: </strong>Twenty healthy participants were assigned to the vibration or control group. An aiming task that involved acquiring targets by moving an unseen cursor on a screen was performed. Vision of the cursor and hand were unavailable throughout the four blocks of movement execution. Only the vibration group received dual vibration throughout four blocks. Task performance was assessed using measures of endpoint accuracy and timing. Perceived hand location was assessed using a set of questions and a computerised conscious perception task.</p><p><strong>Results: </strong>The vibration group had significantly shorter reaction times, without any change in endpoint accuracy, indicating more efficient and effective movement planning. The vibration group did report illusory movement sensation, which was reduced by block 4.</p><p><strong>Conclusions: </strong>Dual vibration did not adversely affect aiming accuracy and showed some improvement in reaction time. The present findings support the potential for using dual vibration to stimulate the somatosensory system as participants improved their performance of a novel goal-directed movement. Notably, improvements were maintained when the vibration was removed.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"238-253"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71416435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The influence of stereotaxic lesions of claustrum on motor movements and behaviour in rats.","authors":"Ahmet Eren Seçen, Didem Tuba Akçalı, Ergin Dileköz, Emin Çağıl, Denizhan Divanlıoğlu, Özgür Öcal, Hayrunnisa Bolay Belen","doi":"10.1080/08990220.2023.2280563","DOIUrl":"10.1080/08990220.2023.2280563","url":null,"abstract":"<p><strong>Background: </strong>This study aimed to expand our existing information on changes in the regulation of motor movement and behaviour by investigating the effects of unilateral and bilateral lesions on the claustrum (CL).</p><p><strong>Material and methods: </strong>36 Wistar Albino adult male rats were randomly divided into six groups. An electrical lesion was created with a constant current source in the unilateral and bilateral anterior clastrum using a stereotaxic frame in rats. The lesioned groups and the control group underwent an automatic behaviour recording device such as mobilisation, freezing, eating, drinking behaviour, grooming, turning, etc. behaviour was recorded and analysed. Simultaneously, ultrasonic sounds in rats were examined with ultrasonic sound recording program. Anxiety was then reassessed with the elevated plus maze test. Data were compared with the control group. Rats were eventually sacrificed and the brain tissue was post-fixed. Histochemical examination was done and lesions' existence was confirmed.</p><p><strong>Results: </strong>In this study, lesions of ventral of CL can cause increase in spontaneous behaviours such as freezing and rearing. And, it has been shown to cause a statistically significant change. In addition to the behavioural changes, right CL lesions have caused a significant increase in drinking behaviour associated with increased anxiety. All operated groups showed a significant decrease in clockwise and counterclockwise rotation movements.</p><p><strong>Conclusion: </strong>Experimental results show that CL lesions influence spontaneous behaviour which indicate the need for new studies to understand the role of CL in anxiety-depression.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"264-271"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134650803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of a contralateral foot touch on stability of one-leg stance in young adults: an exploratory study.","authors":"Balsam J Alammari, Yunju Lee, Alexander S Aruin","doi":"10.1080/08990220.2023.2280541","DOIUrl":"10.1080/08990220.2023.2280541","url":null,"abstract":"<p><strong>Purpose: </strong>Previous studies demonstrated that providing light finger touch to a stationary object leads to reduced body sway. The focus of the current exploratory study was on the investigation of postural sway during one-leg stance when light touch is provided by the contralateral foot.</p><p><strong>Methods: </strong>Eleven healthy young adults participated in the study. They stood on the top of the force platform with eyes open and on their dominant leg with no touch and with a touch from the contralateral foot applied to the stance leg. Medial arch, heel, and big toe of the contralateral foot were used to touch the medial malleolus or mid shank of the stance leg. The excursion, velocity, and sway area of the centre of pressure were obtained and analysed.</p><p><strong>Results: </strong>Standing with light touch from the contralateral foot to the medial malleolus resulted in significantly smaller postural sway as compared to standing with no touch (<i>p</i> < 0.05). There was no difference in the study outcomes between conditions of standing with a touch applied by the medial arch, heel, or big toe to the stance leg.</p><p><strong>Conclusions: </strong>The results of the study suggest that the application of light touch provided by a contralateral foot could be an effective strategy for enhancing body stability when no external support is available. The study outcome provides a foundation for future studies exploring ways to enhance balance control during one-leg stance.</p>","PeriodicalId":94211,"journal":{"name":"Somatosensory & motor research","volume":" ","pages":"254-263"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"107593178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}