Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Rhythmic activity"”.
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Mechanisms of ionic current changes underlying rhythmic activity recovery after decentralization
Neuronal networks capableof generating rhythmic output in the absence of patterned sensory or central inputs are widely represented in the nervous system where they support a variety of functions, from learning and memory to rhythmic motor activity such as breathing. To perfectly function in a …
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Cellular and Circuit Properties of Slow Oscillations In The Thalamic Reticular Nucleus
… (TRN) generate distinct types of oscillatory activity. While the reciprocal synaptic circuits between TRN and sensory thalamic nuclei underlie the generation of sleep spindles, the mechanisms regulating slow (<1 >Hz) forms of thalamic oscillations are poorly understood. Under <em>in vitro</em> …
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Modeling the hippocampus : finely controlled memory storage using spiking neurons
… second study examined the underpinnings of the rhythmic activity of the hippocampus. These oscillations in the theta range (4-12 Hz) are theorize to play a major role in the memory functions and in processing sequences of events and actions in both place and time. We found the generation of …
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Steroid Synthesis Patterns in Cultured Fetal and Neo-Natal Hamster Adrenal Glands
… developed, it became apparent that the daily rhythmic activity of organisms fell mainly into two categories. The rhythms were either exogenous or endogenous in origin (Frisch, 1960; Burning, 1964; Wolf, 1962; Sollberger, 1965). | Exogenous rhythms in living systems depend on the cyclic …
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Regulation of Thalamic Neuron Excitability and Intrathalamic Rhythms by Vasoactive Intestinal Peptide
… antioscillatory actions of VIP on intrathalamic rhythmic activity (Chapter 2). The excitatory and antioscillatory actions of VIP are predominantly mediated by VPAC2 receptors, and are mediated via the cyclic AMP-dependent second messenger system (Chapter 3). In Chapter 4, I describe experiments …
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The role of specific voltage-activated and calcium-activated potassium currents in shaping motor neuron firing output during rhythmic motor activity
Rhythmic muscle contractions underlie a number of behaviors, such as respiration, ingestion, and locomotion, which are necessary for survival. Though in many cases motor neurons (MNs) themselves do not generate the basic motor rhythm, research suggests that the intrinsic properties of MNs may shape …
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Translation and transcription are required for endogenous bursting after long term removal of neuromodulators
… neuromodulatory inputs to regulate the network activity. The pyloric network of the Cancer borealis stomatogastric ganglion (STG), a rhythmic motor pattern-generating network, requires modulatory inputs to generate this activity. When neuromodulatory inputs are removed, the pyloric network falls …
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The Fifteenth-Century French Chanson: A Computer-Aided Study of Styles and Style Change
… showing chord configurations, nonharmonic tones, rhythmic activity, voice crossing, voice direction, and range; and (b) for each composition and repertory, a statistical summary of properties such as chord inversion and duration, nonharmonic tone classification and distribution, root and bass-line …
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Images of Remembered Earth
… pitch selection, the overall tempo scheme, rhythmic activity, and formal shape. Pitch materials are expansive by design; this expansive quality is exhibited through the employment of wedge-shaped musical ideas and through the utilization of higher and lower registers. O'Keeffe's use of color …
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Calcium Channel Gamma(6) Subunit: In Search of Its Functions and Mechanisms of Action
… activated (LVA) calcium currents regulate rhythmic activity and cell proliferation in the heart. Previous studies using heterologous expression systems showed that gamma6 robustly inhibits Cav3.1 current, which is a major LVA component in adult atrial myocytes. On the other hand, gamma4 and …
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The comparison of two rhythm syllable systems on the meter recognition abilities of second and third grade students
… and a student questionnaire to identify prior rhythmic activity experience. During the treatment period, the students learned the same rhythm patterns: instruction differed only in the type of rhythm syllable system used. The time-based treatment group used Kodaly rhythm syllables, the …
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An In Vitro mammalian model for investigating locomotor pattern generation
… inhibited by Mg$\sp{++}$). Spontaneous bursting activity rarely occurred. In contrast, NMDA increased the occurrence of rhythmicity, especially in the absence of Mg$\sp{++}$. When rhythmic activity occurred spontaneously or was evoked by NMDA, rhythm was usually present in one muscle and faster …
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Functional investigation of PERIOD in the mammalian circadian clock
… Per clock genes are essential for circadian rhythmicity, little is known about the cell-autonomous mechanisms that confer 24h organisation to the activity and subcellular localisation of PER-containing complexes. In this study, I aimed to provide a molecular understanding for the rhythmic …
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A neuronal switch for approach/avoidance in cost-benefit decision
… to orient or avoid was a function of spontaneous rhythmic activity in the feeding motor network. In addition, manipulating the feeding network activity modified the fictive turn motor output in response to the unilateral sensory stimulus. Activation and suppression of the feeding network by …
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Loss of synchrony in an inhibitory network of type-I oscillators
… in the generation and regulation of coherent rhythmic activity in a variety of neural systems. While recent work revealed the synchronizing influence of inhibitory coupling on the dynamics of many networks, it is known that strong coupling can destabilize phase-locked firing. Here we examine …
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The Role of Gamma Oscillations and Cortical Inhibition In The Development of Working Memory In Adolescence
… study. First, I investigated the endogenous rhythmic activity generated by children and adolescence when performing a serially presented working memory task of varying set size. I found evidence of maturation in the generation of gamma-band rhythms which differed in power between groups, but …
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State-space modeling of MEG time series
… non-invasively offers information about neural activity in the brain by measuring its magnetic field. Estimating the cerebral sources of neural activity from MEG is an ill-posed inverse problem that presents several challenges. First, this inverse problem is high-dimensional, as the number of …
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Vibration Serviceability of Long Span Slender Floors
… serviceability issues in building floors under rhythmic loading. This happens as a result of reduced natural frequencies and damping ratios due to reduced structural rigidity (Devin et al, 2015). Even though these vibrations do not lead to structural failure in most cases, they can often create …
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A computational and experimental study of the Drosophila larval locomotor system and its developmental critical period
… neuronal network dynamics is adjusted through activity-regulated plasticity mechanisms. Because plasticity is elevated, these phases are also vulnerable, such that disturbances during this highly plastic phase, but not outside, can lead to lasting maladjustment. In humans, several …
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The philosophical, behavioural and academic merit of uMaskandi music
… performers. The sound of the music, the observed rhythmic activity of the performers, and the language of the libretto and its elocution are only the surface of the activity. There is still, but, more signification in the unsaid source of the music. The reason for the neglect of this music style …