sensory

感官
  • 文章类型: Journal Article
    沙捞越,婆罗洲,拥有16种独特的Durio物种,其中一半是可食用的,只有Duriozibethinus被广泛种植。尽管它们对砂拉越的农村社区具有营养和经济意义,鲜为人知的土著榴莲在科学文献中的代表性仍然不足,同时面临着在野外灭绝的风险。因此,这项研究的目的是对这些野生食用榴莲进行全面的化学分析,提供对他们的营养和感官味道属性的见解。在最佳成熟度下分离可食用部分,并对样品进行进一步分析。野生食用榴莲基因型表现出不同的特征,甚至在同一物种内。大多数野生榴莲的特征是主要由蔗糖组成的糖组合物,占67.38-96.96%,除了以其低总糖含量(每100克0.49±0.17克)而闻名的红肉Durio坟墓。尽管味道平淡,该物种的脂肪含量(14.50±0.16%)和纤维含量(12.30±0.14%)明显更高。Duriodulcis表现出明显更高的碳水化合物含量(29.37-30.60%),其强烈的气味归因于其蛋白质含量低(2.03-2.04%)。土著榴莲提供每日矿物质摄入量的相当大百分比,100克提供约15.71-26.80%的钾,71.72-86.52%的磷,9.33-27.31%的镁,和足够的微量矿物质。黄色的鲜艳的肉色,橙色和红色肉质的Duriograveolens和Duriokutejensis显示出高水平的抗坏血酸(31.41-61.56mg100g-1),类胡萝卜素(976.36-2627.18µg100g-1)和抗氧化特性,而Duriodulcis和Duriooxleyanus,尽管他们的肉体沉闷,含有较高的酚类(67.95-74.77mgGAE100g-1)和类黄酮(8.71-13.81QEmg100g-1)水平。这些努力使人们对野生食用榴莲的营养丰富度有了更深入的了解,从而支持商业化和保护工作。
    Sarawak, Borneo, harbours 16 unique Durio species, half of which are edible, with only Durio zibethinus widely cultivated. Despite their nutritional and economic significance to the rural communities in Sarawak, the lesser-known indigenous durians remain underrepresented in the scientific literature while facing the risk of extinction in the wild. Thus, the aim of this study was to conduct comprehensive chemical analyses of these wild edible durians, offering insights into their nutritional and sensory taste attributes. The edible part was separated at optimal ripeness, and the samples were subjected to further analysis. Wild edible durian genotypes exhibit varied characteristics, even within the same species. The majority of wild durians are characterized by a sugar composition consisting predominantly of sucrose, constituting 67.38-96.96%, except for the red-fleshed Durio graveolens renowned for its low total sugar content (0.49 ± 0.17 g per 100 g). Despite its bland taste, this species possessed significantly greater fat (14.50 ± 0.16%) and fibre (12.30 ± 0.14%) content. Durio dulcis exhibited a significantly greater carbohydrate content (29.37-30.60%), and its intense smell was attributed to its low protein content (2.03-2.04%). Indigenous durians offer substantial percentages of daily mineral intake, with 100 g servings providing approximately 15.71-26.80% of potassium, 71.72-86.52% of phosphorus, 9.33-27.31% of magnesium, and sufficient trace minerals. The vibrant flesh colours of yellow-, orange- and red-fleshed Durio graveolens and Durio kutejensis show high levels of ascorbic acid (31.41-61.56 mg 100 g-1), carotenoids (976.36-2627.18 µg 100 g-1) and antioxidant properties, while Durio dulcis and Durio oxleyanus, despite their dull flesh, contained high phenolic (67.95-74.77 mg GAE 100 g-1) and flavonoid (8.71-13.81 QE mg 100 g-1) levels. These endeavours provide a deeper understanding of the nutritional richness of wild edible durians, thereby supporting commercialization and conservation efforts.
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  • 文章类型: Journal Article
    背景神经传导研究有助于理解周围神经系统的各种病理。它有助于医生区分两种主要类型的外周病因:轴突变性和脱髓鞘。以过度脂肪沉积或肥胖形式的体重增加可能对神经传导产生令人担忧的影响。所以,找到各种人体测量参数(年龄,性别,高度,体重,腰臀比和体重指数)与运动和感觉正中神经传导参数(潜伏期,振幅和速度)进行了这项横断面研究。材料与方法共选取87名受试者及其身高,体重,使用标准技术测量腰臀比和体重指数.在肌电图机上测量运动和感觉神经传导参数。数据被存储,列表和分析。结果男性和女性受试者的平均身高±SD分别为1.699±0.072m和1.589±0.067m。男性和女性受试者的平均体重±SD分别为64.089±11.497kg和52.949±8.404kg,分别。正常的平均BMI,体重不足和超重受试者的±SD分别为21.668±2.048kg/m2,17.074±0.794kg/m2和26.595±0.915kg/m2。体重与运动正中神经传导的潜伏期具有显着相关性(p=0.0025)。在男性和女性受试者中,腰臀比与运动正中神经传导速度显着相关(p=0.042和p=0.036)。分别。超重类别的BMI与运动正中神经传导研究的潜伏期和波幅有显著的相关性(p=0.0156和p=0.0290),分别。结论本研究表明,身体BMI的增加会影响神经传导。这可以作为评估肥胖对周围神经传导影响的初步研究,尤其是在印度人口中。
    Background Nerve conduction studies ease the understanding of the various pathologies of the peripheral nervous system. It helps physicians to delineate between the two principal types of peripheral etiologies: axonal degeneration and demyelination. An increase in weight in the form of excessive fat deposition or obesity could have a worrisome effect on nerve conduction. So, to find the association of various anthropometric parameters (age, gender, height, weight, waist-hip ratio and body mass index) with motor and sensory median nerve conduction parameters (latency, amplitude and velocity) this cross-sectional study was conducted. Materials and method A total of 87 subjects were taken and their height, weight, waist-hip ratio and body mass index were measured using standard techniques. Motor and sensory nerve conduction parameters were measured on an electromyography machine. Data was stored, tabulated and analyzed. Results The average height of male and female subjects ± SD was 1.699 ± 0.072 m and 1.589 ± 0.067 m respectively. The average weight of male and female subjects ± SD was 64.089 ± 11.497 kg and 52.949 ± 8.404 kg, respectively. The average BMI of normal, underweight and overweight subjects ± SD was 21.668 ± 2.048 kg/m2, 17.074 ± 0.794 kg/m2 and 26.595 ± 0.915 kg/m2 respectively. Weight showed a significant (p = 0.0025) correlation with the latency of motor median nerve conduction. Waist-hip ratio showed a significant (p = 0.042 and p = 0.036) correlation with motor median nerve conduction velocity in both male and female subjects, respectively. BMI in the overweight category showed a significant (p = 0.0156 and p = 0.0290) correlation with latency and amplitude of motor median nerve conduction study, respectively. Conclusions This study exemplifies that an increase in BMI of our body can affect nerve conduction. This could serve as a preliminary study to assess the effect of obesity on peripheral nerve conduction, especially in the Indian population.
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  • 文章类型: Journal Article
    背景:自闭症谱系障碍(ASD)是一种儿童期发病的复杂神经发育障碍,其特征是交流和社交互动存在问题,并且受到限制,重复,刻板的行为。ASD的患病率为36名儿童中的1名。尽管ASD具有很高的遗传力,但其遗传结构很复杂。为了确定ASD的潜在候选基因,我们对与ASD一致或不一致的单卵(MZ)双胞胎进行了全面的遗传学研究。
    方法:本研究招募了5对MZ双胞胎及其父母。双胞胎中有四个是和谐的,而其中一个是ASD的不和谐。对双胞胎及其父母进行全外显子组测序。使用Twist人类定制核心外显子组试剂盒富集外显子组DNA,在HiSeq系统上进行配对末端测序。
    结果:我们发现了几种罕见的致病变异(纯合隐性,复合杂合,从头)在受ASD影响的个体中。
    结论:我们报告了诊断为ASD的个体的新变异。这些基因中有几个与大脑相关的功能有关,以前在ASD中没有报道。有趣的是,在涉及感官知觉的基因中观察到了一些变异(听觉[MYO15A,PLEC,CDH23,UBR3,GPSM2],嗅觉[OR9K2],味觉[TAS2R31],andvisual[CDH23,UBR3]).这是印度人口中MZ双胞胎的首次全面遗传研究。需要进一步验证以确定这些变体是否与ASD相关。
    BACKGROUND: Autism spectrum disorder (ASD) is a childhood-onset complex neurodevelopmental disorder characterized by problems with communication and social interaction and restricted, repetitive, stereotyped behavior. The prevalence of ASD is one in 36 children. The genetic architecture of ASD is complex in spite of its high heritability. To identify the potential candidate genes of ASD, we carried out a comprehensive genetic study of monozygotic (MZ) twins concordant or discordant for ASD.
    METHODS: Five MZ twins and their parents were recruited for the study. Four of the twins were concordant, whereas one was discordant for ASD. Whole exome sequencing was conducted for the twins and their parents. The exome DNA was enriched using Twist Human Customized Core Exome Kit, and paired-end sequencing was performed on HiSeq system.
    RESULTS: We identified several rare and pathogenic variants (homozygous recessive, compound heterozygous, de novo) in ASD-affected individuals.
    CONCLUSIONS: We report novel variants in individuals diagnosed with ASD. Several of these genes are involved in brain-related functions and not previously reported in ASD. Intriguingly, some of the variants were observed in the genes involved in sensory perception (auditory [MYO15A, PLEC, CDH23, UBR3, GPSM2], olfactory [OR9K2], gustatory [TAS2R31], and visual [CDH23, UBR3]). This is the first comprehensive genetic study of MZ twins in an Indian population. Further validation is required to determine whether these variants are associated with ASD.
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  • 文章类型: Journal Article
    玉米丝,通常被认为是甜玉米加工中的废料,通常被大多数食品制造业丢弃。本研究旨在通过评估玉米丝的植物化学物质来最大限度地利用玉米丝,物理化学和感官特性。具有增强的营养价值的食品的开发是该行业的科学家和食品生产者的紧迫关注。因此,这项研究的重点是创建高营养松饼掺入未充分利用的玉米丝粉(CSP)。在松饼准备中,CSP用于以10%的水平部分替代精制小麦粉,20%,30%和40%。随着CSP比例的增加,松饼的蛋白质和粗纤维含量逐渐增加。此外,加入CSP后,松饼的总酚含量和抗氧化活性显着增加(p≤0.05),当使用CSP代替40%的精制小麦粉时,达到最大值。CSP的掺入导致L*(亮度)值降低,导致松饼中较低的a*(红色)和b*(黄色)值。纹理分析表明,凝聚力,随着配方中CSP含量的增加,松饼的咀嚼性和胶粘性增加。进行感官评价以评估玉米丝松饼的可接受性。在松饼中添加CSP改善了感官特征,包括颜色,香气,口感,质地和整体可接受性。这些发现表明,CSP有潜力用于开发烘焙食品,即时混合,婴儿食品配方和增值项目。
    Corn silk, often considered as a waste material in sweet corn processing, is typically discarded by most food manufacturing industries. This study aims to maximize the utilization of corn silk by evaluating its phytochemical, physicochemical and sensory characteristics. The development of food products with enhanced nutritional value is a pressing concern for both scientists and food producers in the industry. Therefore, this research focuses on the creation of highly nutritious muffins incorporating underutilized corn silk powder (CSP). In the muffin preparation, CSP was used to partially replace refined wheat flour at levels of 10%, 20%, 30% and 40%. As the proportion of CSP increased, the protein and crude fiber content of the muffins gradually increased. Additionally, the total phenolic content and antioxidant activity of the muffins significantly increased (p ≤ 0.05) with the inclusion of CSP, reaching their maximum values when CSP was used to replace 40% of the refined wheat flour. The incorporation of CSP led to a decrease in the L* (lightness) value, resulting in lower a* (redness) and b* (yellowness) values in the muffins. Texture analysis revealed that the cohesiveness, chewiness and gumminess of the muffins increased as the amount of CSP in the recipe was raised. A sensory evaluation was conducted to assess the acceptability of the corn silk muffins. The addition of CSP in muffins improved the sensory characteristics including colour, aroma, mouthfeel, texture and overall acceptability. These findings indicate that CSP has the potential to be used in the development of bakery food products, instant mixes, infant food formulas and value-added items.
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  • 文章类型: Journal Article
    视觉系统已经发展为区分不同波长的光。感知颜色的能力,或特定的光波长,很重要,因为颜色传达了有关环境中生物和非生物特征的关键信息。的确,不同波长的光可以驱动脊椎动物大脑中不同的活动模式,然而,尚不完全了解的是,不同的波长是否可以引起病因相关的行为变化。为了解决可见光谱中的特定波长如何调节行为性能,我们使用幼体斑马鱼和刻板的光搜索行为。先前的工作表明,光的停止会触发过渡的光搜索行为,我们用它来询问波长相关的行为调制。在可见光范围内使用8个窄光谱光源,我们证明了所有波长诱导的运动参数与搜索行为一致,然而,搜索行为的幅度是频谱敏感的,基本的运动参数在短时间内以不同的模式调制,中等,和长波长。然而,我们的数据还表明,并非所有搜索的运动特征都受到波长的影响.要定义波长如何调制搜索性能,我们用替代波长进行了额外的测定,双波长,和可变强度。最后,我们还测试了盲幼虫,以确定波长依赖性行为变化的哪些成分可能包括来自非视网膜光接收的信号。这些发现具有重要意义,因为生物体可以在实验室和自然环境中暴露于不同的波长,因此会产生独特的行为输出。
    Visual systems have evolved to discriminate between different wavelengths of light. The ability to perceive color, or specific light wavelengths, is important as color conveys crucial information about both biotic and abiotic features in the environment. Indeed, different wavelengths of light can drive distinct patterns of activity in the vertebrate brain, yet what remains incompletely understood is whether distinct wavelengths can invoke etiologically relevant behavioral changes. To address how specific wavelengths in the visible spectrum modulate behavioral performance, we use larval zebrafish and a stereotypic light-search behavior. Prior work has shown that the cessation of light triggers a transitional light-search behavior, which we use to interrogate wavelength-dependent behavioral modulation. Using 8 narrow spectrum light sources in the visible range, we demonstrate that all wavelengths induce motor parameters consistent with search behavior, yet the magnitude of search behavior is spectrum sensitive and the underlying motor parameters are modulated in distinct patterns across short, medium, and long wavelengths. However, our data also establishes that not all motor features of search are impacted by wavelength. To define how wavelength modulates search performance, we performed additional assays with alternative wavelengths, dual wavelengths, and variable intensity. Last, we also tested blind larvae to resolve which components of wavelength dependent behavioral changes potentially include signaling from non-retinal photoreception. These findings have important implications as organisms can be exposed to varying wavelengths in laboratory and natural settings and therefore impose unique behavioral outputs.
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  • 文章类型: Journal Article
    声音是哺乳动物的重要导航线索。在空间导航中,海马位置细胞根据视觉信息编码环境的空间表示,但是在多大程度上,音频空间信息可以实现可靠的位置细胞映射是未知的。我们通过在黑暗中记录CA1位置细胞来评估这一点,在视觉可靠的情况下,触觉,或嗅觉信息不可用。雄性大鼠暴露于从局部或远端空间位置传递的不同频率的听觉线索。我们观察到远端,但不是本地提示演示,启用并支持稳定的位置字段,无论使用的声音频率。我们的数据表明,对于位置场映射的听觉信息的相关性存在上下文依赖性:而本地可用的听觉线索并不能作为位置场锚定的显着空间基础,听觉线索定位以远端信息的形式支持位置细胞的空间表示。此外,我们的结果表明,CA1神经元可以有效地利用听觉刺激来产生位置场,并且海马锥体神经元不仅依赖于视觉线索来生成基于非中心参考框架的位置场表示。
    Sound is an important navigational cue for mammals. During spatial navigation, hippocampal place cells encode spatial representations of the environment based on visual information, but to what extent audiospatial information can enable reliable place cell mapping is largely unknown. We assessed this by recording from CA1 place cells in the dark, under circumstances where reliable visual, tactile, or olfactory information was unavailable. Male rats were exposed to auditory cues of different frequencies that were delivered from local or distal spatial locations. We observed that distal, but not local cue presentation, enables and supports stable place fields, regardless of the sound frequency used. Our data suggest that a context dependency exists regarding the relevance of auditory information for place field mapping: whereas locally available auditory cues do not serve as a salient spatial basis for the anchoring of place fields, auditory cue localization supports spatial representations by place cells when available in the form of distal information. Furthermore, our results demonstrate that CA1 neurons can effectively use auditory stimuli to generate place fields, and that hippocampal pyramidal neurons are not solely dependent on visual cues for the generation of place field representations based on allocentric reference frames.
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  • 文章类型: Journal Article
    背景和目的:Fugl-Meyer运动能力评估和感觉评估量表(FMA)是中风患者上肢和下肢感觉运动损害最常用和推荐的结果指标。这项研究的目的是进行跨文化翻译和将量表改编为波兰语,并评估FMA对缺血性中风患者上肢和下肢部分的运动表现和感觉的可靠性。方法:波兰语版本的FMA(FMA-PL)是使用一组专家进行的前后翻译开发的,然后由法官小组根据国际准则进行评估。该研究涉及86名患者(F=30,M=56,即35%;患者平均年龄为64±12岁,36的右侧笔划和50的左侧笔划)。FMA-PL由两名经验丰富的神经物理治疗师进行了两次,评估之间有2小时的间隔(重测和评估者之间)。通过计算组内相关系数(ICC)来定义结果测量的可靠性。还计算了测量的标准误差(SEM)和最小可检测变化(MDC)。测试的内部一致性由Cronbach的α指标确定。结果:在FMA-PL量表上评估了三个域。从整个测试来看,结果在12-124分范围内获得:FMA-UE-PL2为64分,FMA-LE-PL4为34分,FMA-S-PL0为24分。对于总FMA-PL评分和每个域的结果,ICC值在0.99-1.00的范围内。针对测试-重测测量计算的整个FMA-PL的SEM和MDC分别为0.22和1.60。在同一研究者的重复测量期间获得的总FMA-PL评分的SEM和MDC分别为1.3和3.5分,分别。为总FMA-PL计算的Cronbachα值,FMA-UE-PL,FMA-LE-PL,和FMA-S-PL项目分别为0.938-0.939、0.932-0.934和0.634-0.722。结论:波兰语版本的FMA是亚急性和慢性中风阶段患者上肢和下肢运动和感觉评估的一致且可靠的结果指标。
    Background and Purpose: The Fugl-Meyer Assessment of Motor Performance and Sensory Assessment Scale (FMA) is the most commonly used and recommended outcome measure for the sensorimotor impairment of the upper and lower limbs in stroke patients. The aim of this study was to perform cross-cultural translation and adaptation of the scale into Polish and to evaluate the FMA\'s reliability of motor performance and sensation of the upper and lower limb sections among ischemic stroke patients. Methods: The Polish version of the FMA (FMA-PL) was developed using a forward-backward translation performed by a group of experts and then evaluated by a panel of judges according to international guidelines. The study involved 86 patients (F = 30, M = 56, i.e., 35%; the average age of patients was 64 ± 12 years, 36 with right-sided stroke and 50 with left-sided stroke). The FMA-PL was carried out twice by two experienced neurological physiotherapists with a 2 h gap between assessments (test-retest and inter-rater). The reliability of the outcome measure was defined by calculating the intraclass correlation coefficient (ICC). The standard error of measurement (SEM) and the minimum detectable change (MDC) were also calculated. The internal consistency of the test was determined by the Cronbach\'s alpha indicator. Results: Three domains were evaluated on the FMA-PL scale. From the whole test, results were obtained in the range of 12-124 points: 64 points for FMA-UE-PL 2, 34 points for FMA-LE-PL 4, and 24 points for FMA-S-PL 0. The ICC values were in the range of 0.99-1.00 for the total FMA-PL score and the results of each domain. The SEM and MDC for the entire FMA-PL calculated for test-retest measurements were 0.22 and 1.60, respectively. The SEM and MDC for the total FMA-PL score obtained during repeated measurements of the same investigator were 1.3 and 3.5 points, respectively. The Cronbach\'s alpha values calculated for the total FMA-PL, FMA-UE-PL, FMA-LE-PL, and FMA-S-PL items amounted to 0.938-0.939, 0.932-0.934, and 0.634-0.722, respectively. Conclusions: The Polish version of the FMA is a consistent and reliable outcome measure for the motor and sensory evaluation of the upper and lower limbs for patients in subacute and chronic stroke stages.
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  • 文章类型: Journal Article
    什么是已知的?将身体移入\'定型\',\'重复\',“仪式化”或“不寻常”方式是接受自闭症诊断的标准的一部分。然而,这些运动的原因及其个人价值还没有得到很好的理解。某些移动方式已成为混乱的一部分,并收到了负面的判断,而其他运动则没有。这篇论文补充了什么?我们搜索了在线博客,寻找自闭症成年人写的运动描述,使用他们首选的语言和定义。博客作者说,许多类型的运动吸引了负面的判断,包括运动中表现出的不协调,在不寻常的地方跳舞或反复移动,比如在刺激的时候。然而,运动提供了个人利益,可以增强思考和注意力,提供有意义的例程,有助于感官调节,释放能量,提高身体意识,情绪调节和加强自我认同。对实践和政策的影响运动可能是一种福祉资源,用来减少分心,压倒性的,自闭症患者的困惑和痛苦。这应该在个人应对策略和心理治疗中考虑。这项研究中提供的例子可以为自闭症评估提供信息,以确保运动的含义与运动的外观一起考虑。一些运动,如刺激,与许多其他运动方式具有相同的功能,包括跳舞和锻炼,如果反映在政策和实践中,这可能有助于减少自闭症患者的耻辱。增进理解对于告知如何评估自闭症很重要,以及自闭症的个人经历是如何被听到的。
    UNASSIGNED: What is already known?Moving the body in \'stereotyped\', \'repetitive\', \'ritualised\' or \'unusual\' ways is part of the criteria for receiving a diagnosis of autism. However, the reasons for these movements and their personal value are not well understood. Certain ways of moving have become part of a disorder, and have received negative judgements, whereas other movements have not.What this paper adds?We searched online blogs for descriptions of movement written by autistic adults, using their preferred language and definitions. The blog authors said that many types of movement attracted negative judgement, including mis-coordination shown during sports, dancing in unusual places or moving repetitively, such as when stimming. However, movement provided personal benefits, and could enhance thinking and focus, provide meaningful routine, contribute to sensory regulation, release energy, increase body awareness, emotion regulation and strengthen self-identity.Implications for practice and policyMovement could be a well-being resource, used to reduce distraction, overwhelm, confusion and distress for autistic people. This should be considered within personal coping strategies and psychological therapies. The examples provided in this study could inform autism assessments, to ensure that the meanings of movements are considered alongside the appearances of movement. Some movements such as stimming have the same functions as many other ways of moving, including dancing and exercising, which could help to reduce stigma around being autistic if reflected in policy and practice. Improving understanding is important for informing how autism is assessed, and how personal experiences of being autistic are heard.
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  • 文章类型: Journal Article
    微跳是基本的动眼现象和复杂的认知功能过程之间的接口,对于微妙的实验和充分的统计分析,它们也是一个挑战。在特殊主题问题的第二部分(第一部分见4),作者提出了一系列文章,这些文章表明,微跳仍然是科学研究的一个有趣和有益的领域,在许多领域的感官研究的前沿,感性的,和认知过程。.在他们的文章“复杂决策过程中对认知努力和情绪唤醒的瞳孔和微跳反应”中,44%urawska,Duchowski,&Wichary(1)研究了情感启动下多属性决策过程中瞳孔和微跳对信息处理的反应。参与者被随机分配到三个情感启动条件(中性,令人厌恶的,和色情),并指示做出歧视性决定。正如作者所假设的那样,结果表明,微小扫视速率抑制和瞳孔扩张,取决于决策前的认知努力,并通过情感启动来调节。逆向启动增加了瞳孔和微跳对信息处理工作的反应。结果表明,瞳孔反应受情感启动的影响比微扫视率更大。根据瞳孔和微视行为的神经心理学机制讨论了结果。在文章“在单眼和双眼刺激条件下的微跳速率特征相关”中,Leube,Rifai,&Wahl(2020)研究了微跳在单眼和双眼条件下的定向分布和速率。在两种刺激条件下,参与者都固定了一个Gabor贴片,该贴片在很宽的空间频率范围内以45°或135°的方向随机呈现。微扫视大多是水平取向的,而与光栅的空间频率无关。该结果在两种刺激条件之间是一致的。这项研究发现,微跳跳速率特征曲线在两种刺激条件之间相关,因此,将微跳的使用扩展到临床应用,由于参数为对比敏感度,在临床研究中经常进行单眼测量。马丁的这项研究“高速连续视觉搜索过程中的微跳”,戴维斯,Riesenhuber,&Thorpe(3)提供了对视觉搜索过程中发生的微跳的分析,针对小脸粘贴到杂乱的背景照片或简单的灰色背景。指示参与者在变化的场景中瞄准奇异的3度直立或倒置的面孔。一旦参与者的目光到达目标面部,在不同的随机位置显示了一张新的面孔。无论实验背景如何(例如背景场景,没有背景场景),或目标偏心(从4到20度的视角),作者发现,微视速率在12毫秒内降至接近零的水平。在刺激发作后和第一次扫视之前,几乎没有任何微跳。在大约20%的试验中,有一个单一的微扫视,几乎立即发生在前一个扫视的偏移。作者认为,需要通过处理刺激的视觉层次结构进行一次前馈才能实现长时间的连续视觉搜索,并提供证据证明微扫视可以发挥感知功能,例如在连续视觉搜索过程中纠正扫视或实现面向任务的目标。虽然许多研究已经描述了视觉注视过程中的眼球运动,包括微跳,在大多数情况下,只有水平和垂直分量被记录和分析。关于微跳的扭转成分知之甚少。在这项研究中,“在固定和视动刺激期间快速阶段的微跳的扭转成分”Sadeghpour&Otero-Millan(5)记录了在固定和扭转视动刺激期间围绕三个旋转轴的眼球运动。作者发现,固定过程中微扫视的扭转分量的平均幅度为0.34±0.07度,速度遵循主序列,其斜率与水平和垂直分量相当。微扫视过程中扭转位移的大小与水平分量相关,而与垂直分量无关。与固定刺激固定过程中产生的微跳相比,在存在视动刺激的情况下,诱导眼球震颤产生更频繁和更大的扭转快速阶段。快速相的扭转分量和垂直聚散分量随速度的增加而增加。在以前的研究中,微跳被解释为任务负荷的心理生理指标。到目前为止,不同类型的任务需求如何影响微扫视率仍在争论中。Schneider等人在他们的文章“任务难度与微视速率之间的相互作用:视觉负荷的关键作用的证据”中。(6)检查了视觉负荷之间的关系,心理负荷和微视速率。参与者执行了一个连续的绩效任务(n-back),其中视觉任务负载(字母与抽象数字)和心理任务负荷(1-back到4-back)作为受试者内部变量进行操纵。眼动追踪数据,记录了绩效数据和主观工作量。数据分析显示,对于高视觉需求的刺激(即抽象数字),微扫视速率增加,而精神需求(n-back-level)并不调节微视速率。作者得出结论,微小扫视率反映了任务的视觉负荷,而不是其心理负荷。这一结论符合克鲁格等人的命题。(2)“微跳区分看和看”,将感官与认知现象联系起来。当前的特殊主题为围绕微跳的研究景观增加了几个新的有趣方面。它们仍然是跨学科研究和跨学科应用的有吸引力的焦点。因此,正如在本期特别专题的第一部分中已经指出的那样,对微跳的研究不仅会持续下去,但随着知识库的扩展而不断发展。
    Microsaccades are at the interface between basic oculomotor phenomena and complex processes of cognitive functioning, and they also have been a challenge for subtle experimentation and adequate statistical analysis. In the second part of the special thematic issue (for the first part see  4) the authors present a series of articles which demonstrate that microsaccades are still an interesting and rewarding area of scientific research the forefront of research in many areas of sensory, perceptual, and cognitive processes.. In their article \"Pupillary and microsaccadic responses to cognitive effort and emotional arousal during complex decision making\" Krejtz, Żurawska, Duchowski, & Wichary (1) investigate pupillary and microsaccadic responses to information processing during multi-attribute decision making under affective priming. The participants were randomly assigned into three affective priming conditions (neutral, aversive, and erotic) and instructed to make discriminative decisions. As hypothesized by the authors, the results showed microsaccadic rate inhibition and pupillary dilation, depending on cognitive effort prior to decision and moderated by affective priming. Aversive priming increased pupillary and microsaccadic responses to information processing effort. The results indicate that pupillary response is more influenced by affective priming than microsaccadic rate. The results are discussed in the light of neuropsychological mechanisms of pupillary and microsaccadic behavior. In the article \"Microsaccadic rate signatures correlate under monocular and binocular stimulation conditions\" Essig, Leube, Rifai, & Wahl (2020) investigate microsaccades with respect to their directional distribution and rate under monocular and binocular conditions. In both stimulation conditions participants fixated a Gabor patch presented randomly in orientation of 45° or 135° over a wide range of spatial frequencies. Microsaccades were mostly horizontally oriented regardless of the spatial frequency of the grating. This outcome was consistent between both stimulation conditions. This study found that the microsaccadic rate signature curve correlates between both stimulation conditions, therefore extending the use of microsaccades to clinical applications, since parameters as contrast sensitivity, have frequently been measured monocularly in the clinical studies. The study \"Microsaccades during high speed continuous visual search\" by Martin, Davis, Riesenhuber, & Thorpe (3) provides an analysis of the microsaccades occurring during visual search, targeting to small faces pasted either into cluttered background photos or into a simple gray background.  Participants were instructed to target singular 3-degree upright or inverted faces in changing scenes.  As soon as the participant\'s gaze reached the target face, a new face was displayed in a different random location.  Regardless of the experimental context (e.g. background scene, no background scene), or target eccentricity (from 4 to 20 degrees of visual angle), The authors found that the microsaccade rate dropped to near zero levels within 12 milliseconds.  There were almost never any microsaccades after stimulus onset and before the first saccade to the face. In about 20% of the trials, there was a single microsaccade that occurred almost immediately after the preceding saccade\'s offset.  The authors argue that a single feedforward pass through the visual hierarchy of processing a stimulus is needed to effectuate prolonged continuous visual search and provide evidence that microsaccades can serve perceptual functions like correcting saccades or effectuating task-oriented goals during continuous visual search. While many studies have characterized the eye movements during visual fixation, including microsaccades, in most cases only horizontal and vertical components have been recorded and analyzed. Little is known about the torsional component of microsaccades. In the study \"Torsional component of microsaccades during fixation and quick phases during optokinetic stimulation\" Sadeghpour & Otero-Millan (5) recorded eye movements around the three axes of rotation during fixation and torsional optokinetic stimulus. The authors found that the average amplitude of the torsional component of microsaccades during fixation was 0.34 ± 0.07 degrees with velocities following a main sequence with a slope comparable to the horizontal and vertical components. The size of the torsional displacement during microsaccades was correlated with the horizontal but not the vertical component. In the presence of an optokinetic stimulus a nystagmus was induced producing  more frequent and larger torsional quick phases compared to microsaccades produced during fixation of a stationary stimulus. The torsional component and the vertical vergence component of quick phases increased with higher velocities. In previous research, microsaccades have been interpreted as psychophysiological indicators of task load. So far, it is still under debate how different types of task demands are influencing microsaccade rate. In their article \"The interplay between task difficulty and microsaccade rate: Evidence for the critical role of visual load\" Schneider et al. (6) examined the relation between visual load, mental load and microsaccade rate. The participants carried out a continuous performance task (n-back) in which visual task load (letters vs. abstract figures) and mental task load (1-back to 4-back) were manipulated as within-subjects variables. Eye tracking data, performance data as well as subjective workload were recorded. Data analysis revealed an increased level of microsaccade rate for stimuli of high visual demand (i.e. abstract figures), while mental demand (n-back-level) did not modulate microsaccade rate. The authors concluded that microsaccade rate reflects visual load of a task rather than its mental load. This conclusion is in accordance with the proposition of Krueger et al. (2) \"Microsaccades distinguish looking from seeing\", linking sensory with cognitive phenomena. The present special thematic issue adds several new interesting facets to the research landscape around microsaccades. They still remain an attractive focus of interdisciplinary research and transdisciplinary applications. Thus, as already noted in the first part of this special thematic issue, research on microsaccades will not only endure, but keep evolving as the knowledge base expands.
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  • 文章类型: Journal Article
    嗅觉感觉神经元(OSN)是哺乳动物一生中连续产生的几种神经元类型之一。长期以来,人们一直认为嗅觉感觉神经发生的持久性超出了早期发育的范围,其功能只是为了替换因暴露于环境损害而丢失或受损的神经元。嗅觉感觉神经发生也可能发挥适应性功能的可能性已经得到了相对较少的考虑,很大程度上是由于假设新OSN的生成相对于OSN亚型是随机的,由单个气味受体基因定义,每个神经前体在数百种可能性中随机选择表达。因此,预测不同OSN亚型的相对出生率是恒定的,并且不受嗅觉体验的影响。这个假设受到质疑,然而,有证据表明,特定OSN亚型的出生率可以通过嗅觉剥夺来操纵嗅觉体验而选择性地改变,富集,和条件范式。此外,对损伤后OSN人群恢复的研究提供了进一步的证据,表明嗅觉感觉神经发生在亚型方面可能不是严格随机的。在这里,我们回顾了这些证据,并考虑了特定嗅觉体验可以以亚型选择性方式调节嗅觉感觉神经发生率的前景的机制和功能含义。
    Olfactory sensory neurons (OSNs) are one of a few neuron types that are generated continuously throughout life in mammals. The persistence of olfactory sensory neurogenesis beyond early development has long been thought to function simply to replace neurons that are lost or damaged through exposure to environmental insults. The possibility that olfactory sensory neurogenesis may also serve an adaptive function has received relatively little consideration, largely due to the assumption that the generation of new OSNs is stochastic with respect to OSN subtype, as defined by the single odorant receptor gene that each neural precursor stochastically chooses for expression out of hundreds of possibilities. Accordingly, the relative birthrates of different OSN subtypes are predicted to be constant and impervious to olfactory experience. This assumption has been called into question, however, by evidence that the birthrates of specific OSN subtypes can be selectively altered by manipulating olfactory experience through olfactory deprivation, enrichment, and conditioning paradigms. Moreover, studies of recovery of the OSN population following injury provide further evidence that olfactory sensory neurogenesis may not be strictly stochastic with respect to subtype. Here we review this evidence and consider mechanistic and functional implications of the prospect that specific olfactory experiences can regulate olfactory sensory neurogenesis rates in a subtype-selective manner.
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