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1

Lost in time: a historical frame, elementary processing units and the 3-second window

100%
Poppel E.
Acta Neurobiologiae Experimentalis
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2004
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tom 64
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nr 3
2

Complexity analysis of spontaneous EEG

100%
Bhattacharyya J.
Acta Neurobiologiae Experimentalis
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2000
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tom 60
|
nr 4
The aim of the present paper is the assessment of the overall complexity of spontaneous and non-paroxysmal EEG signals obtained from three groups of human subjects, e.g., healthy, seizure and mania. Linear complexity measure suitable for multi-variate signals, along with nonlinear measures such as approximate entropy (ApEn) and Taken's estimator are considered. The degree of linear complexity is significantly reduced for the pathological groups compared with healthy group. The nonlinear measures of complexity are significantly decreased in the seizure group for most of the electrodes, whereas a distinct discrimination between the maniac and healthy groups based on these nonlinear measures is not evident.
3

Biodiversity and biocomplexity of the protists and an overview of their significant roles in maintenance of our biosphere

100%
Corliss J. O.
Acta Protozoologica
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2002
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tom 41
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nr 3
4

The surface-skimming hypothesis for the evolution of insect flight

100%
Marden J. H.
Acta Zoologica Cracoviensia
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2003
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tom 46
|
nr Suppl.
The surface-skimming hypothesis for the evolution of insect flight poses that insects first used wings and aerodynamic locomotion to move in two dimensions across water surfaces. Here I present an overview of recent advances in our understanding of surface-skimming locomotion, and how these findings relate to phylogenetic origins of insects and developmental and anatomic origins of insect wings. Behavioral surveys show taxonomically widespread use of skimming by Plecoptera and more taxonomically restricted use of skimming by Ephemeroptera. Because these two orders arose near the root of the early split of pterygote insects into the Paleoptera and Neoptera, traits that appear in both groups are strong candidates for traits possessed by the first winged insects. Comparisons across plecopteran species show that skimming speed increases as contact with the water surface decreases, thereby providing a mechanical pathway over which directional selection may have acted to improve aerodynamic capability in early skimmers. Evolution along this route may have occurred within species in response to factors such as scramble competition and sexual selection. Phylogenetic analyses suggest that the common ancestor of modern Plecoptera was capable of both skimming and flying; such dual ability is widespread among extant stoneflies, including the most basal families. Both the mechanics and the semi-aquatic setting of skimming fit well with the growing understanding that insects and crustaceans are sister clades and that insect wings evolved from gills.
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