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- The National Academy of Sciences
- National Academy of Sciences
- Massachusetts Institute of Technology
- Universidade Federal de Goiás; Brasil; UFG; Programa de Pós-graduação em Educação em Ciências e Matemática (PRPG); Instituto de Matemática e Estatística - IME (RG)
- Universidade Federal de Goiás; BR; UFG; Mestrado em Educação em Ciências e Matemática; Ciências Exatas e da Terra
- Biblioteca Digital da Unicamp
- C M B Association
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Resultados filtrados por Publicador: The National Academy of Sciences
‣ Functional neuroanatomy of biological motion perception in humans
Fonte: The National Academy of Sciences
Publicador: The National Academy of Sciences
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
558.05023%
We used whole brain functional MRI to investigate the neural
network specifically engaged in the recognition of “biological
motion” defined by point-lights attached to the major joints and
head of a human walker. To examine the specificity of brain regions
responsive to biological motion, brain activations obtained during a
“walker vs. non-walker” discrimination task were compared with
those elicited by two other tasks: (i) non-rigid motion
(NRM), involving the discrimination of overall motion direction in the
same “point-lights” display, and (ii) face-gender
discrimination, involving the discrimination of gender in briefly
presented photographs of men and women. Brain activity specific to
“biological motion” recognition arose in the lateral cerebellum
and in a region in the lateral occipital cortex presumably
corresponding to the area KO previously shown to be particularly
sensitive to kinetic contours. Additional areas significantly activated
during the biological motion recognition task involved both, dorsal and
ventral extrastriate cortical regions. In the ventral regions both
face-gender discrimination and biological motion recognition elicited
activation in the lingual and fusiform gyri and in the Brodmann areas
22 and 38 in superior temporal sulcus (STS). Along the dorsal pathway...
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‣ Spatiotemporal variation of metabolism in a plant circadian rhythm: The biological clock as an assembly of coupled individual oscillators
Fonte: The National Academy of Sciences
Publicador: The National Academy of Sciences
Tipo: Artigo de Revista Científica
Publicado em 25/09/2001
Português
Relevância na Pesquisa
558.17555%
The complex dynamic properties of biological timing in organisms
remain a central enigma in biology despite the increasingly precise
genetic characterization of oscillating units and their components.
Although attempts to obtain the time constants from oscillations of
gene activity and biochemical units have led to substantial progress,
we are still far from a full molecular understanding of
endogenous rhythmicity and the physiological manifestations
of biological clocks. Applications of nonlinear dynamics have
revolutionized thinking in physics and in biomedical and life sciences
research, and spatiotemporal considerations are now advancing our
understanding of development and rhythmicity. Here we show that the
well known circadian rhythm of a metabolic cycle in a higher plant,
namely the crassulacean acid metabolism mode of photosynthesis, is
expressed as dynamic patterns of independently initiated variations in
photosynthetic efficiency (φPSII) over a single leaf.
Noninvasive highly sensitive chlorophyll fluorescence imaging reveals
randomly initiated patches of varying φPSII that are
propagated within minutes to hours in wave fronts, forming dynamically
expanding and contracting clusters and clearly dephased regions of
φPSII. Thus...
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