Complexity and Communication 3.0

There is an increasing interest in the complexity of mainstream communication education, and in the management of today's Global Media Organizations. Real world systems in communication processes cannot be completely designed, controlled, understood, or predicted, even by the sciences of complexity, but they are more effectively understood and explained as complex systems. I explore complexity in this article, analyzing the new paradigm of Agenda-Setting of today's New Media and Communication.     

Determination of Peierls stress from acoustic harmonic generation

The interaction of acoustic waves with dislocations leads to aperiodic oscillations in the magnitude of the acoustic nonlinearity parameter β as a function of the acoustic drive amplitude σ _ampl. The magnitude and spacing of the oscillations depend on the value of the Peierls stress. A least-square curve fit of the β(σ _ampl) equation to experimental data taken of 99.999% pure aluminum monocrystals oriented for wave propagation along the [1?0?0] crystal axis yields the value 6.2?×?10⁴?Pa for the Peierls stress. The value is consistent with the smallest values reported in the literature for aluminum where for both theoretical and experimental studies the reported values range over three orders of magnitude.     

Bending experiments on the xi'-(Al-Pd-Mn) quasicrystal approximant

Single crystals of the quasicrystal approximant phase xi'1-(Al-Pd-Mn) were deformed at a high temperature in three-point bending geometry. Two different mechanisms of plastic deformation were observed in this phase: one based on the motion of phason lines and the other based on dislocations. Line directions and Burgers vector directions of the dislocations were determined. The relative importances of the two mechanisms are discussed as a function of the sample orientation with respect to the bending geometry.     

Regulating Biopharming: The Prism of Farmer Knowledge

Farmers have local knowledge relevant to the prospective assessment of biopharming—the farming of transgenic plants and animals genetically modified to produce pharmaceutical substances for use in humans or animals. However, biopharming regulatory regimes are being constructed in ways that render farmers' knowledge irrelevant. The exclusion of farmer knowledge is traceable to what we call its politico-epistemic unworkability as regulatory knowledge in regulatory regimes characterised not only by a focus on risk but also by pre-commitments to market-driven innovation and individual freedom of choice. Such innovation requires predictability in the regulatory environment, which is supplied in part through regulatory authorities' adoption of risk-assessment methodologies that both assume predictability (of natural and social worlds) and generate predictable decision outcomes. These regulatory approaches are co-constituted with scientific knowledge of gene flow developed through studies that can demonstrate a reliable and readily modellable decline of undesirable effect across space or time and therefore make possible the setting of clear and workable parameters for risk management. The farmers' knowledge discussed here highlights the extent to which this is a process of co-production. Moreover, it suggests that the claimed economic advantages of outdoor biopharming, achieved through the substitution of agronomic practice for laboratory infrastructure, depend both on natural processes that always also threaten to undermine confinement and on the habitus of successful farmers, which may in fact be incompatible with the kind of risk management that biopharming requires.     

Global Leadership,Education, and Human Survival

Global leadership is the pivotal point for appropriate policies and action to ensure human survival, but a fast-changing world requires a learning leadership. How can potential and serving leaders acquire the necessary skills, abilities, and attributes for them to recognize and address the threats and challenges to our survival in the contemporary world? Serving leaders have little time for formal learning. They learn on the job through reciprocal peer interaction and transactional relationships with their followers. But the global aspect demands another dimension, cybernetic learning, within which an awareness of global ethics is central.     

Evolution of the Global Corporation: A Systemic Perspective

The growth of the modern corporation from local and nationally centered origins to the multinational and then the global level is traced on the one hand to global flows of matter, energy, and information, and on the other to the geographic and political constraints exercised by nation-states. The emergence of the global corporation follows basic laws of evolution applicable to all complex systems, whether in nature or in society. Thus the global corporation is a new but not an anomalous phenomenon on the stage of history.     

A functional near-infrared spectroscopy study of sustained attention to local and global target features

Despite a long history of vigilance research, the role of global and local feature discrimination in vigilance tasks has been relatively neglected. In this experiment participants performed a sustained attention task requiring either global or local shape stimuli discrimination. Reaction time to local feature discriminations was characterized by a quadratic trend over time-on-task with performance levels returning to initial levels late in the task. This trend did not occur in the global shape discrimination task. Functional near-infrared spectroscopy (fNIRS) was utilized in this study as an index of cerebral activation. In both tasks there was increased right hemisphere relative to left hemisphere oxygenation and right hemisphere oxygenation increased with time-on-task. Left hemisphere oxygenation, however, decreased slightly in the global task, but increased significantly in the local task as task duration increased. Indeed, total oxygenation, averaging both right and left, increased more with time-on-task in the local discrimination task. Both the performance and physiological results of this study indicate increased utilization of bilateral cerebral resources with time-on-task in the local, but not the global discrimination vigil.     

Direct Evidence of Memory Retrieval as a Source of Difficulty in Non‐Local Dependencies in Language

Linguistic dependencies between non‐adjacent words have been shown to cause comprehension difficulty, compared with local dependencies. According to one class of sentence comprehension accounts, non‐local dependencies are difficult because they require the retrieval of the first dependent from memory when the second dependent is encountered. According to these memory‐based accounts, making the first dependent accessible at the time when the second dependent is encountered should help alleviate the difficulty associated with the processing of non‐local dependencies. In a dual‐task paradigm, participants read sentences that did or did not contain a non‐local dependency (i.e., object‐ and subject‐extracted cleft constructions) while simultaneously remembering a word. The memory task was aimed at making the word held in memory accessible throughout the sentence. In an object‐extracted cleft (e.g., It was Ellen whom John consulted…), the object (Ellen) must be retrieved from memory when consulted is encountered. In the critical manipulation, the memory word was identical to the verb's object (ELLEN). In these conditions, the extraction effect was reduced in the comprehension accuracy data and eliminated in the reading time data. These results add to the body of evidence supporting memory‐based accounts of syntactic complexity.     

On the depth reversibility of point-light actions

We investigate the occurrence of perspective reversals for a depth-ambiguous point-light figure. In addition, we exploit the phenomenon of reversibility to search for stimulus features relevant in the process of depth assignment. Experiment 1 shows that perceptual switches indeed occur during prolonged viewing, although the switches occur infrequently. The reversibility is confirmed in Experiment 2, in which the perceptual ambiguity of the point-light action is manipulated as well as observers’ intention to perceive a particular alternative. In addition, the pattern of eye movements reveals local stimulus features specifically associated with the perception of the different alternatives. In Experiment 3, the importance of these features as determining factors of the initial interpretation is investigated by manipulating the location of the first fixation on the stimulus. Implications for a better understanding of biological motion perception are discussed.     

Visual impressions of generative transmission

ABSTRACT

Previous research has shown that stimuli in which a moving object (A) contacts a stationary one (B) and stops, and object B then moves off in the same direction, give rise to a causal impression: object A is perceived as producing the motion of object B. This impression is weakened or does not occur if there is a delay between A contacting B and B moving, or if there is a spatial gap between B and the location at which A stops. It is shown that a strong causal impression can occur despite the presence of both gap and delay if there are cues to generative transmission of causal influence from A to B. The cues investigated were successive colour change of a series of objects filling the gap between A and B. Reported causal impressions were stronger with the colour change stimuli than with stimuli in which the objects were present but did not change colour, and stronger if the colour change proceeded from A to B than if it proceeded in the opposite direction. Reported causal impressions increased in strength as the number of objects involved in the colour change increased, consistent with the hypothesis that the colour change is a cue to a process of transmission, and inconsistent with the hypothesis that it is perceived or inferred as involving a chain of causal relations. Other kinds of changes to object properties—a small upward motion, shrinkage without moving, and disappearance—yielded similar results. It appears that any rapid sequential change in object properties in the direction of causal influence can function to give rise to the visual impression of generative transmission. The possible role of apparent motion is discussed.