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851.
In the present report, we describe a new dynamic field theory that captures the dynamics of visuo-spatial cognition. This theory grew out of the dynamic systems approach to motor control and development, and is grounded in neural principles. The initial application of dynamic field theory to issues in visuo-spatial cognition extended concepts of the motor approach to decision making in a sensori-motor context, and, more recently, to the dynamics of spatial cognition. Here we extend these concepts still further to address topics in visual cognition, including visual working memory for non-spatial object properties, the processes that underlie change detection, and the ‘binding problem’ in vision. In each case, we demonstrate that the general principles of the dynamic field approach can unify findings in the literature and generate novel predictions. We contend that the application of these concepts to visual cognition avoids the pitfalls of reductionist approaches in cognitive science, and points toward a formal integration of brains, bodies, and behavior. 相似文献
852.
Troels Degn Johansson 《Knowledge, Technology, and Policy》2008,21(4):181-189
The live outdoor webcam seems inseparable from the mid-1990s’ popular proliferation of the Internet. Combining a well-known
medium, i.e. the photograph, with a new one, i.e. the Internet, the live outdoor webcam seems in the rear-view mirror to have
contributed significantly to the popular perception of the Internet as a globally distended and thus “geographical” medium.
Moreover, due to its role in the NASA Triana mission, the never-realised flagship of the Clinton–Gore administration’s Digital
Earth project, the live webcam seemed to play an important part in the construction of what leading geographers coined a “virtual
geography”—the geography of the Internet, and the networked geography—that sought to establish itself as a new field of study
during the late 1990s. In order to substantiate for this interpretation, I would like in the first part of this article to
identify a number of basic characteristics of the outdoor webcam and, in the second, to analyse and discuss two papers written
by leading scholars in the field; papers which have been important in the assessment of the impact of the Internet and geographical
information systems (GIS) before the scientific community as well as policy makers within technological innovation and the
public sector.
相似文献
Troels Degn JohanssonEmail: |
853.
Martha Storandt 《Current directions in psychological science》2008,17(3):198-202
ABSTRACT— Evidence from longitudinal, experimental, and neuroimaging studies converge to indicate that psychological functions other than episodic memory are affected very early in the course of Alzheimer's disease and, indeed, may predate or influence the apparent memory deficits. Changes in personality and difficulty in executive function, especially in terms of attentional and inhibitory control, are especially prominent. Deficits in other types of memory (i.e., semantic memory, conditioning) can also be detected in the early stages of the disease. It is time to update existing diagnostic criteria for this form of dementia in terms of current knowledge of multiple and interacting brain systems. 相似文献
854.
Chaos-related obstructions to predictability have been used to challenge accounts of theory validation based on the agreement
between theoretical predictions and experimental data (Rueger & Sharp, 1996. The British Journal for the Philosophy of Science, 47, 93–112; Koperski, 1998. Philosophy of Science, 40, 194–212). These challenges are incomplete in two respects: (a) they do not show that chaotic regimes are unpredictable in principle (i.e., with unbounded resources) and, as a result, that there is something conceptually wrong with idealized expectations of correct predictions from acceptable theories, and (b) they do not explore whether chaos-induced
predictive failures of deterministic models can be remedied by stochastic modeling. In this paper we appeal to an asymptotic analysis of state space trajectories and their numerical approximations
to show that chaotic regimes are deterministically unpredictable even with unbounded resources. Additionally, we explain why
stochastic models of chaotic systems, while predictively successful in some cases, are in general predictively as limited
as deterministic ones. We conclude by suggesting that the way in which scientists deal with such principled obstructions to
predictability calls for a more comprehensive approach to theory validation, on which experimental testing is augmented by
a multifaceted mathematical analysis of theoretical models, capable of identifying chaos-related predictive failures as due
to principled limitations which the world itself imposes on any less-than-omniscient epistemic access to some natural systems.
We give special thanks to two anonymous reviewers for their helpful comments that have substantially contributed to the final
version of this paper 相似文献
855.
856.
857.
Miller A 《Brain and cognition》2007,65(1):47-68
The social neuroscience of child and adolescent depression is inherently multidisciplinary. Depressive disorders beginning early in life can have serious developmental and functional consequences. Psychopathology research has described depression's defining clinical and contextual features, and intervention research has characterized its response to treatment and prevention programs. Neuroendocrine, electrophysiological, and neuroimaging studies have identified core neurobiological aspects of early-onset mood disorders. These areas are reviewed using a developmental social neuroscience perspective for integrating disparate observations. The paper introduces a dynamic adaptive systems framework, and it discusses hedonic capacity, stress sensitivity, ruminative self-focus, and attentional impairments as fundamental components of mood disorders. 相似文献
858.
We taught 4 students with profound multiple disabilities to use a microswitch communication system to request a change in recreational stimuli during social interactions with nondisabled peers. In Study 1, we conducted a preference assessment across a range of stimuli for each student. The most and least preferred stimuli were incorporated into microswitch communication system training in Study 2. During the second study, 3 of the 4 students (a) learned to use the microswitch communication system to control stimulus presentation, (b) more clearly differentiated their time among stimuli, and (c) increased their level of general alertness. Study 3 extended the use of the microswitch communication system to social interactions with nondisabled peers. Two students were more engaged in interactions when they chose when to change stimuli; 1 student was more alert when a peer chose when to change activities; a 4th student showed an undifferentiated pattern. The outcomes of the investigation are discussed in terms of the effects of controlling stimulus presentation on the behavior of students with profound multiple disabilities and the stability of preference hierarchies over time. 相似文献
859.
James A.T. Lancaster 《Zygon》2011,46(1):26-46
Abstract. This paper examines the impact of two formalizations of evolutionary biology on the antiselectionist critiques of the Intelligent Design (ID) movement. It looks first at attempts to apply the syntactic framework of the physical sciences to biology in the twentieth century, and to their effect upon the ID movement. It then examines the more heuristic account of biological‐theory structure, namely, the semantic model. Finally, it concludes by advocating the semantic conception and emphasizing the problems that the semantic model creates for ID's negative and positive theses. 相似文献
860.
Joan Stiles 《Child Development Perspectives》2009,3(3):196-202
Abstract— The past several decades have seen tremendous progress in understanding mammalian brain development. The models that have emerged suggest that this development is dynamic and, from the very beginning, involves the continuous interaction of genetic, organismic, and environmental factors. The central question posed in this article is whether these models of brain development should be of import to developmental psychologists. It is argued that the key debates in psychology are founded on assumptions that are integrally related to questions of biology and biological inheritance. The construct of innateness, in particular, is central to these debates, and the biological system most critically implicated in claims about innate behaviors is the brain. However, as this article attempts to show, the underlying assumptions of contemporary psychological models reflect largely outdated ideas about what it means for something to be innate. Contemporary models of brain development challenge the foundational constructs of the nature versus nurture formulation, emphasizing that the processes of brain development engage both inherited and environmental factors and rely upon their continuous interaction. These models also emphasize that the relationship between brain and behavioral development is one of interdependence and reciprocity: Behaviors influence brain development and the brain mediates all behavior. Thus, the key to understanding the origins and emergence of both the brain and behavior lies in understanding how genetic, organismic, and environmental factors are engaged in the dynamic and interactive processes that define development of the neurobehavioral system. 相似文献