1,986 research outputs found

    Pengaruh Motivasi dan Penilaian Kinerja terhadap Kinerja pada Pegawai Rimba Baru

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    Penelitian ini bertujuan untuk mengetahui dan menganalisis pengaruh motivasi dan pelatihan terhadap kinerja pegawai PT. Rimba Baru, untuk mengetahui dan menganalisis pengaruh motivasi terhadap kinerja pegawai PT. Rimba Baru dan untuk mengetahui dan menganalisis pengaruh pelatihan terhadap kinerja pegawai PT. Rimba Baru. Teknik sampling yang digunakan pada penelitian ini adalah teknik sampling probablitas (probability). Jumlah sampel dalam penelitian ini adalah sebanyak 98 orang. Metode analisis data yang digunakan adalah analisis linear bergandaHasil penelitian ini adalah secara parsial variabel motivasi dan penilaian kinerja berpengaruh signifikan terhadap kinerja pegawai pada PT. Rimba Baru dan variabel penilaian kinerja lebih berpengaruh dominan terhadap kinerja pegawai dibandingkan variabel motivasi di PT. Rimba Baru dilihat dari besarnya koefisien regresi. Secara serempak, variabel motivasi dan penilaian kinerja berpengaruh signifikan terhadap kinerja pegawai pada PT. Rimba Baru. Nilai adjusted R squere = 0,102 atau 10,2% yang artinya bahwa secara serempak, variabel motivasi dan penilaian kinerja mempunyai pengaruh 10,2% terhadap kinerja pegawai pada PT. Rimba Baru. Sedangkan sisanya sebesar 89,8% dijelaskan oleh variabel-variabel yang lain yang mempengaruhi kinerja pegawai

    Age-dependent contribution of domain-general networks to semantic cognition

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    Aging is characterized by a decline of cognitive control. In semantic cognition, this leads to the paradox that older adults usually show poorer task performance than young adults despite their greater semantic knowledge. So far, the underlying neural changes of these behavioral differences are poorly understood. In the current neuroimaging study, we investigated the interaction of domain-specific and domain-general networks during verbal semantic fluency in young and older adults. Across age groups, task processing was characterized by a strong positive integration within the multiple-demand as well as between the multiple-demand and the default mode network during semantic fluency. However, the behavioral relevance of strengthened connectivity differed between groups: While within-network functional connectivity in both networks predicted greater efficiency in semantic fluency in young adults, it was associated with slower performance in older adults. Moreover, only young adults profited from connectivity between networks for their semantic memory performance. Our results suggest that the functional coupling of usually anticorrelated networks is critical for successful task processing, independent of age, when access to semantic memory is required. Furthermore, our findings lend novel support to the notion of reduced efficiency in the aging brain due to neural dedifferentiation in semantic cognition

    Age-related reorganization of functional network architecture for language processing

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    Facilitatory stimulation of the pre-SMA in healthy aging has distinct effects on task-based activity and connectivity

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    Semantic cognition is central to communication and our understanding of the world. It is usually well preserved in healthy aging. However, semantic control processes, which guide semantic access and retrieval, decline with age. The present study explored the potential of intermittent theta burst stimulation (iTBS) to enhance semantic cognition in healthy middle-aged to older adults. Using an individualized stimulation approach, we applied iTBS to the pre-supplementary motor area (pre-SMA) and assessed task-specific effects on semantic judgments in functional neuroimaging. We found increased activation after effective relative to sham stimulation only for the semantic task in visual and dorsal attention networks. Further, iTBS increased functional connectivity in domain-general executive networks. Notably, stimulation-induced changes in activation and connectivity related differently to behavior: While increased activation of the parietal dorsal attention network was linked to poorer semantic performance, its enhanced coupling with the pre-SMA was associated with more efficient semantic processing. Our findings indicate differential effects of iTBS on activity and connectivity. We show that iTBS modulates networks in a task-dependent manner and generates remote network effects. Stimulating the pre-SMA was linked to more efficient but not better performance, indicating a role in domain-general semantic control processes distinct to domain-specific semantic control

    Age-related reorganization of functional network architecture in semantic cognition

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    Cognitive aging is associated with widespread neural reorganization processes in the human brain. However, the behavioral impact of such reorganization is not well understood. The current neuroimaging study investigated age differences in the functional network architecture during semantic word retrieval in young and older adults. Combining task-based functional connectivity, graph theory and cognitive measures of fluid and crystallized intelligence, our findings show age-accompanied large-scale network reorganization even when older adults have intact word retrieval abilities. In particular, functional networks of older adults were characterized by reduced decoupling between systems, reduced segregation and efficiency, and a larger number of hub regions relative to young adults. Exploring the predictive utility of these age-related changes in network topology revealed high, albeit less efficient, performance for older adults whose brain graphs showed stronger dedifferentiation and reduced distinctiveness. Our results extend theoretical accounts on neurocognitive aging by revealing the compensational potential of the commonly reported pattern of network dedifferentiation when older adults can rely on their prior knowledge for successful task processing. However, we also demonstrate the limitations of such compensatory reorganization and show that a youth-like network architecture in terms of balanced integration and segregation is associated with more economical processing

    Supporting the learning of deaf students in higher education: a case study at Sheffield Hallam University

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    This article is an examination of the issues surrounding support for the learning of deaf students in higher education (HE). There are an increasing number of deaf students attending HE institutes, and as such provision of support mechanisms for these students is not only necessary but essential. Deaf students are similar to their hearing peers, in that they will approach their learning and require differing levels of support dependant upon the individual. They will, however, require a different kind of support, which can be technical or human resource based. This article examines the issues that surround supporting deaf students in HE with use of a case study of provision at Sheffield Hallam University (SHU), during the academic year 1994-95. It is evident that by considering the needs of deaf students and making changes to our teaching practices that all students can benefit

    Modeling magnetospheric fields in the Jupiter system

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    The various processes which generate magnetic fields within the Jupiter system are exemplary for a large class of similar processes occurring at other planets in the solar system, but also around extrasolar planets. Jupiter's large internal dynamo magnetic field generates a gigantic magnetosphere, which is strongly rotational driven and possesses large plasma sources located deeply within the magnetosphere. The combination of the latter two effects is the primary reason for Jupiter's main auroral ovals. Jupiter's moon Ganymede is the only known moon with an intrinsic dynamo magnetic field, which generates a mini-magnetosphere located within Jupiter's larger magnetosphere including two auroral ovals. Ganymede's magnetosphere is qualitatively different compared to the one from Jupiter. It possesses no bow shock but develops Alfv\'en wings similar to most of the extrasolar planets which orbit their host stars within 0.1 AU. New numerical models of Jupiter's and Ganymede's magnetospheres presented here provide quantitative insight into the processes that maintain these magnetospheres. Jupiter's magnetospheric field is approximately time-periodic at the locations of Jupiter's moons and induces secondary magnetic fields in electrically conductive layers such as subsurface oceans. In the case of Ganymede, these secondary magnetic fields influence the oscillation of the location of its auroral ovals. Based on dedicated Hubble Space Telescope observations, an analysis of the amplitudes of the auroral oscillations provides evidence that Ganymede harbors a subsurface ocean. Callisto in contrast does not possess a mini-magnetosphere, but still shows a perturbed magnetic field environment. Callisto's ionosphere and atmospheric UV emission is different compared to the other Galilean satellites as it is primarily been generated by solar photons compared to magnetospheric electrons.Comment: Chapter for Book: Planetary Magnetis
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