729 resultados para Evolutionary music


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MOTOR IMPAIRMENTS ARE COMMON AFTER STROKE but efficacious therapies for these dysfunctions are scarce. Extending an earlier study on the effects of music-supported training (MST), behavioral indices of motor function were obtained before and after a series of training sessions to assess whether this new treatment leads to improved motor functions. Furthermore, music-supported training was contrasted to functional motor training according to the principles of constraint-induced therapy (CIT). In addition to conventional physiotherapy, 32 stroke patients with moderately impaired motor function and no previous musical experience received 15 sessions of MST over a period of three weeks, using a manualized, step-bystep approach. A control group consisting of 15 patients received 15 sessions of CIT in addition to conventional physiotherapy. A third group of 30 patients received exclusively conventional physiotherapy and served as a control group for the other three groups. Fine as well as gross motor skills were trained by using either a MIDI-piano or electronic drum pads programmed to emit piano tones. Motor functions were assessed by an extensive test battery. MST yielded significant improvement in fine as well as gross motor skills with respect to speed, precision, and smoothness of movements. These improvements were greater than after CIT or conventional physiotherapy. In conclusion, with equal treatment intensity, MST leads to more pronounced improvements of motor functions after stroke than CIT.

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Mitochondrial genomes (mitogenomes) are useful and relatively accessible sources of molecular data to explore and understand the evolutionary history and relationships of eukaryotic organisms across diverse taxonomic levels. The availability of complete mitogenomes from Platyhelminthes is limited; of the 40 or so published most are from parasitic flatworms (Neodermata). Here, we present the mitogenomes of two free-living flatworms (Tricladida): the complete genome of the freshwater species Crenobia alpina (Planariidae) and a nearly complete genome of the land planarian Obama sp. (Geoplanidae). Moreover, we have reanotated the published mitogenome of the species Dugesia japonica (Dugesiidae). This contribution almost doubles the total number of mtDNAs published for Tricladida, a species-rich group including model organisms and economically important invasive species. We took the opportunity to conduct comparative mitogenomic analyses between available free-living and selected parasitic flatworms in order to gain insights into the putative effect of life cycle on nucleotide composition through mutation and natural selection. Unexpectedly, we did not find any molecular hallmark of a selective relaxation in mitogenomes of parasitic flatworms; on the contrary, three out of the four studied free-living triclad mitogenomes exhibit higher A+T content and selective relaxation levels. Additionally, we provide new and valuable molecular data to develop markers for future phylogenetic studies on planariids and geoplanids.

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Digitoitu 16. 10. 2008.

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Digitoitu 31. 12. 2008

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Pro gradu -tutkielmassani tarkastelen niitä merkityksiä, joita afrikkalaisamerikkalainen musiikillinen esitystraditio saa Nobel-kirjailija Toni Morrisonin romaanissa Jazz (1992).Morrison on toistuvasti löytänyt vertailukohdan omalle kirjoittamiselleen mustasta musiikkitraditiosta. Kuvaillessaan Jazz-romaanin luomisprosessia hän on kertonut pyrkineensä rakentamaan teoksen improvisatorisen jazz-performanssin muotoon. Tutkielmassa kysyn, millä tavalla tämä jazz-improvisatorinen kerrontamuoto ilmenee Jazz-romaanissa ja miksi musiikki ja kerronnan musiikillisuus on saanut niin merkittävän roolin afrikkalaisamerikkalaisen kirjallisuuden traditiossa. Keskeiselle sijalle tutkielmassani nousee ajatus improvisatorisesta jazz-performanssista sekä romaania ohjaavana kerronnallisena periaatteena että mustan diasporisen kulttuurin ja identiteetin rakentamisen välineenä. Tukeutumalla muun muassa Ralph Ellisonin, James Baldwinin, Albert Murrayn, Henry Louis Gates Jr:n, Houston A. Baker Jr:n, Paul Gilroyn, Kimberly W. Benstonin ja Nathaniel Mackeyn kirjoituksiin mustasta esitystraditiosta tarkastelen, mitä eri merkityksiä jazz- ja blues-musiikille on annettu afrikkalaisamerikkalaisessa kirjallisuudessa. Jazzissa musiikki toimii ensisijaisesti keinona työstää menneisyyttä: musiikillinen improvisaatio avaa tien ihmisen henkilökohtaisten muistojen ja menneisyyden konfliktien tarkastelulle. Kyse on identiteettiprosessista, joka ohjaa toistuvasti määrittelemään uudelleen ne rakenteet, joissa ihmisen minuus kehittyy. Samalla musiikillisuuden taustalta voidaan löytää pyrkimys vapauttaa teos kertovuudesta ja kohdistaa lukijan huomio tekstin tuottamaan liikkeeseen, romaaniin performanssina. Tämä ohjaa kirjallisuuden kohti rituaalista: musiikillisuuden funktiona on tuoda tarina voimakkaammin osaksi lukijan kokemuksellista nykyhetkeä. Morrisonin romaanikirjoittamista ohjaa halu kehittää jatkuvasti uusia mahdollisuuksia ymmärtää ja lähestyä menneisyyttä sekä rakentaa kriittinen suhde afrikkalaisamerikkalaista kulttuuria määrittäneisiin historiallisiin narratiiveihin. Jazzromaanin tapahtumat sijoittuvat keskelle afrikkalaisamerikkalaisen urbaanin kulttuurin ja amerikkalaisen modernismin kehityksen keskeisintä vuosikymmentä, 1920-lukua. Romaanin sisällön analyysissa tarkastelen muun muassa romaanin kaupunkitilan kuvausta ja sen kiinnittymistä urbaanin kulutuskulttuurin tuottamaan visuaaliseen spektaakkeliin. Jazzissa Morrisonin voidaan nähdä työstävän suhdetta tiettyyn historialliseen aikakauteen, joka on merkittävällä tavalla muokannut sekä afrikkalaisamerikkalaista kulttuurista yhteisöllisyyttä että tiettyjä ”mustan” tai ”mustuuden” representaatioita osana amerikkalaista urbaania ympäristöä.

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Music is one of the most pleasant human experiences, even though it has no direct biological advantage. However little is known about individual differences in how people experience reward in music-related activities. The goal of the present study was to describe the main facets of music experience that could explain the variance observed in how people experience reward associated with music. To this end we developed the Barcelona Music Reward Questionnaire (BMRQ), which was administrated to three large samples. Our results showed that the musical reward experience can be decomposed into five reliable factors: Musical Seeking, Emotion Evocation, Mood Regulation, Social Reward, and Sensory-Motor. These factors were correlated with socio-demographic factors and measures of general sensitivity to reward and hedonic experience. We propose that the five-factor structure of musical reward experience might be very relevant in the study of psychological and neural bases of emotion and pleasure associated to music.

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En el marco de las competencias profesionales del educador musical, la creatividad ocupa una posición que a menudo ha sido definida como sistémica. La labor del educador y/o formador en el aula de música requiere, de forma genérica, el despliegue de competencias que incorporen la creatividad. En este artículo se presentan los resultados de un trabajo realizado con dos muestras de alumnos, de tercer curso de magisterio y de un curso postgrado. Se ofrecen y se analizan los datos recogidos con la finalidad de desplegar un mapa que integre competencias creativas genéricas, específicas y disciplinares

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The role of behavior in evolution remains controversial, despite that some ideas are over 100 years old. Changes in behavior are generally believed to enhance evolution by exposing individuals to new selective pressures and by facilitating range expansions. However, this hypothesis lacks firm empirical evidence. Moreover, behavioral changes can also inhibit evolution by hiding heritable variation from natural selection. Taking advantage of the complete phylogeny of extant birds, a new species-level measure of past diversification rate and the best existing measures of brain size (n = 1326 species), I show here that relative brain size is associated (albeit weakly) with diversification rates. Assuming that brain relative size reflects behavioral flexibility, an assumption well-supported by evidence, this finding supports the idea that behavior can enhance evolutionary diversification. This view is further supported by the discovery that the most important factor influencing diversification rates is ecological generalism, which is believed to require behavioral flexibility. Thus, behavioral changes that expose animals to a variety of environments can have played an important role in the evolution of birds.

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This project addresses methodological and technological challenges in the development of multi-modal data acquisition and analysis methods for the representation of instrumental playing technique in music performance through auditory-motor patterning models. The case study is violin playing: a multi-modal database of violin performances has been constructed by recording different musicians while playing short exercises on different violins. The exercise set and recording protocol have been designed to sample the space defined by dynamics (from piano to forte) and tone (from sul tasto to sul ponticello), for each bow stroke type being played on each of the four strings (three different pitches per string) at two different tempi. The data, containing audio, video, and motion capture streams, has been processed and segmented to facilitate upcoming analyses. From the acquired motion data, the positions of the instrument string ends and the bow hair ribbon ends are tracked and processed to obtain a number of bowing descriptors suited for a detailed description and analysis of the bow motion patterns taking place during performance. Likewise, a number of sound perceptual attributes are computed from the audio streams. Besides the methodology and the implementation of a number of data acquisition tools, this project introduces preliminary results from analyzing bowing technique on a multi-modal violin performance database that is unique in its class. A further contribution of this project is the data itself, which will be made available to the scientific community through the repovizz platform.

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The chemical indexes, suggested by Gottlieb et al., have not been used before regarding evolutionary tendency of species in the Swartzia genus. However, the importance of this work encouraged for an analysis of the Swartzia genus using the metabolites isolated from nine species. The analysis, based on calculated chemical indexes, provided an evolutionary tendency for these plants, which correlates with the classification based on morphological analysis.

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A common feature of natural populations is that individuals differ in morphology, physiologyand behavior (i.e .phenotype). A thorough understanding of the molecular mechanisms and evolutionary forces behind this phenotypic variation is a prerequisite for understanding evolution.This thesis examines the molecular mechanism and the roles of the different evolutionary forces in plumage colour variation in pied flycatchers (Ficedulahypoleuca). Malepied flycatchers exhibit marked variation in both pigmentary and structural plumage colourand the trait has repeatedly been suggested to be of adaptive significance. An examination of plumage colour variation on reproductive output trevealed that structural colouration, and more specifically the degree of ultraviolet (UV) reflectance had an effect on number of young sired. Paternity analyses of breeding males revealed that males that had been cuckolded by their social mate tended to be less UV reflectant than males that had not been cuckolded.Neither pigment-based norstructural colouration was found to affect the probability of siring young in other nests. Phenotypic differentiation was found to be markedly greater than differentiation at neutralgenetic markers across the pied flycatcher breeding range. Furthermore patterns of differentiationin phenotypes and selectively neutral genes were not uniform. Outlier tests searching for genomic footprints of selection revealed elevated levels of genetic divergence in a gene associated with feather development (and thus potentially structural colouration) and ultraviolet vision. Th eobserved differentiation in allelic frequencies was particularly pronounced in the Spanish piedflycatcher populations. Examining gene expression during feather development indicated that the TYRP1 gene (known to be involved in the production of black pigment) may be relevant in generating phenotypic variation in pied flycatcher plumage. Also, energy homeostasis related genesfeatured prominently among the genes found to be expressed in one extreme phenotype but not the other. This is of particular interest in light of what is known about the pleiotropy ofthe melanocortin system which underlies brown-black pigment production. The melanocortinsystem is also associated with energy homeostasis (among a number of other physiological functions) and thus the results could be pointing to the signalling function of brown-blackplumage. Plumage colour variation in pied flycatchers, both structural and pigmentary, can thus beconcluded to be exhibiting signals of non-neutral evolution. Structural colouration was found to play a role in sexual selection and putative signals of selection were further detected in acandidate gene for this trait. Evidence for non-neutral evolution of pigmentary colouration was also detected. These findings, together with the fact that preliminary evidence for an energy balance associated signalling function for plumage was found, present good starting points for further investigations into the meaning and mechanisms of plumage colour variation in piedflycatchers.