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 21 for “"HVC"”.
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Analysis of Novel Genes Whose mRNAs are Enriched in the HVC-Associated Telencephalon of Songbirds
… surrounding and including song nucleus HVC. The goal of the analysis was to determine what kind of protein is encoded by each RNA, whether the RNA distinguishes sites of defined neural plasticity (i.e., the telencephalic song control nuclei or the neurogenic ventricular zone), and …
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Net Addition and Long-Term Survival of Adult-Born Neurons in the Zebra Finch HVC: Why Replace When You Can Keep Them All?
… Many neurons in the canary song control nucleus, HVC, are discarded every year, with cell loss peaking at the end of the breeding season. New neurons numerically replace those that have died and this replacement process occurs at a time when vocal output is most plastic, suggesting adult …
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Control of Sexually Dimorphic Brain Pathway Development in Cultured Zebra Finch Brain Slices
… of a male-specific projection from nucleus HVC (higher vocal center, in the neostriatum) to nucleus RA (robust nucleus of the archistriatum). Fibers from HVC first enter the male RA about day 30 post-hatch, and extend toward but never enter the female RA except in birds given estrogen …
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Neural mechanisms underlying the emergence of rhythmic and stereotyped vocalizations in juvenile songbirds
… that a premotor area in the songbird brain, HVC, is important for stereotyped adult song, the role of HVC in juvenile song is less known. This thesis characterizes how activity in HVC develops during song learning in juvenile birds. Early in song learning, temporal structure emerged in HVC. …
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An Emergent Architecture for Scaling Decentralized Communication Systems (DCS)
… clustering using hierarchical virtual clusters (HVC) to facilitate self-organizing network structures. With increasing network complexity, decentralized systems can generally lead to unreliable and irregular service quality, especially given unpredictable node mobility and traffic dynamics. The …
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A neural clock underlying the temporal dynamics of an auditory memory
… used in imitation. We provide evidence that HVC, a pre-motor region that controls the timing of adult song, is involved in storing the timing of the tutor memory. This works shows how focal cooling can be used to study the formation of temporally structured memories even in the absence of …
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Building a state space for song learning
… been observed in the premotor cortical nucleus HVC, where neurons burst in sparse sequences. However, such sparse sequences are not present in very young birds, which sing highly variable syllables of random lengths. Furthermore, young birds learn by imitating a tutor song, and it was previously …
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Generation and tuning of learned sensorimotor behavior by multiple neural circuit architectures
… of single-unit recordings in zebra finch area HVC during singing. While HVC is known to be essential for proper expression of adult vocalization, its circuit architecture is contentious. Evidence is presented against the recently postulated gesture-trajectory extrema hypothesis for the …
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A study of the absorption characteristics of gaseous galaxy halos in the local Universe
… Milky Way, the so-called high-velocity clouds (HVCs), fast moving neutral gas complexes in the halo that can be traced by absorption-line measurements, are believed to play a crucial role in the overall matter cycle in our Galaxy. Over the last decades, the properties of these halo structures …
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Molecular Analysis of Neural Structures During Song Learning in the Zebra Finch
… in nucleus RA during the formation of the HVC to RA connection in motor path for song production. The timing of this event suggests that changes in neurofilament structure marks the ingrowth of axons from HVC into RA. I used differential display PCR to identify myelin basic protein as …
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Transitioning Between Preparatory and Precisely Sequenced Neuronal Activity in Production of a Skilled Motor Behavior
… projection neurons in the cortical song nucleus HVC are necessary for producing learned song and exhibit precise sequential activity during singing. Using cell-type specific calcium imaging we identify populations of HVC premotor neurons associated with the beginning and ending of singing-related …
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Androgen Regulation of Gene Expression Associated with Cell Growth and Neural Plasticity: Studies in Songbird Brain and the S115 Cell Line
… in the canary to the testis and the song nuclei HVc, RA, and MAN. The AR mRNA is regulated by androgens in the periphery in a tissue specific manner. Using a sensitive semi-quantitative per assay, regulation of the AR mRNA by androgen treatment and by natural fluctuations of circulating androgens …
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Alternate methodology for generation and use of key characteristics
… from suppliers; Hardware Variability Control (HVC) addressed hardware variation internal to Boeing. One of the tools utilized by both AQS and HVC is the use of Key Characteristics. Key Characteristics are defined at Boeing as "Attributes or features of a material, part, assembly, installation …
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Neural mechanisms of early motor control in the vocal behavior of juvenile songbirds
… subsong did not require the high vocal center (HVC) - a premotor structure long known as the key region for controlling singing in adult birds - but did require the lateral magnocellular nucleus of the nidopallium (LMAN) - the output region of basal ganglia-forebrain circuitry previously …
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Songbird Brain Organization and its Molecular Convergence with Humans for Vocal Imitation Learning
… regions is convergent as well. In songbirds, HVC and LMAN are two premotor regions each critical for proper production and imitation of sounds respectively. In humans, prominent premotor regions activated during speech include the LMC, Broca's area, and the Supplementary Motor Area (SMA). …
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Low power circuits and systems for wireless neural stimulation
… were implanted into the songbird motor nucleus HVC of zebra finches. Single-neuron recordings revealed that wireless stimulation of HVC led to a strong increase of spiking activity in its downstream target, the robust nucleus of the arcopallium (RA). When this device was used to deliver biphasic …
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Colour analysis and the classification of fruit
… Munsell colour wheel of hue, value and chroma (HVC); the L*u*v* system; the L *a*b* system; the Red, Green and Blue (RGB) system; and the hue, saturation and intensity (HSI) perceptual colour representations. In addition, several clustering and classification techniques were investigated and …
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Investigation into the Neurogenetics of Vocal Learning in Tursiops Truncatus, the Bottlenose Dolphin
… analogous vocal learning nuclei in songbirds (HVC and RA). To screen for the putative “vocal learning” specialized subregion of the identified dolphin motor cortex, we conducted double-label Fluorescent in Situ Hybridization (FISH) experiments for SLIT1, a downregulated marker for these …
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Dynamische Stabilisierung von Hochgeschwindigkeitswolken im galaktischen Halo
HI observations of high-velocity clouds (HVCs) indicate that they are interacting with their ambient medium. In this thesis, the question on the dynamical and thermal stabilization of a cold dense neutral cloud in a hot, thin, and magnetized ambient halo plasma is addressed. The results of …
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Decentralized optimization approach for power distribution network and microgrid controls
… control designs to a hybrid voltage control (HVC) scheme that can achieve the dual objectives in terms of flexible adaptivity to variable rate of communications and global optimality of voltage regulation performance. Such an innovative design aims to unify the separated framework of either …
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