Self-organized criticality (SOC) is based upon the idea that complex behavior can develop spontaneously in certain multi-body systems whose dynamics vary abruptly. This book is a clear and concise introduction to the field of self-organized criticality, and contains an overview of the main research results. The author begins with an examination of what is meant by SOC, and the systems in which it can occur. He then presents and analyzes computer models to describe a number of systems, and (...) he explains the different mathematical formalisms developed to understand SOC. The final chapter assesses the impact of this field of study, and highlights some key areas of new research. The author assumes no previous knowledge of the field, and the book contains several exercises. It will be ideal as a textbook for graduate students taking physics, engineering, or mathematical biology courses in nonlinear science or complexity. (shrink)

In this commentary, we propose that the shifts in symmetry Wynn documents may be explained in terms of simpler mechanisms than he suggests. Furthermore, we argue that it is dangerous to draw definitive conclusions about the cognitive abilities of a species from the level of symmetry observed in the artefacts produced by that species.

The promise of Newtonian science to create a universal precise explanation of all phenomena seems to be out-dated. “Cutting through complexity” may kill potential solutions. The complexity of real phenomena should be accepted and at best tamed by appropriate techniques. Complexity, a recent megatrend in the sciences, may effectuate another scientific revolution.

This paper proposes to present a novel method of generating cryptographic dynamic substitution-boxes, which makes use of the combined effect of discrete hyperchaos mapping and algebraic group theory. Firstly, an improved 2D hyperchaotic map is proposed, which consists of better dynamical behaviour in terms of large Lyapunov exponents, excellent bifurcation, phase attractor, high entropy, and unpredictability. Secondly, a hyperchaotic key-dependent substitution-box generation process is designed, which is based on the bijectivity-preserving effect of multiplication with permutation matrix to obtain satisfactory configuration (...) of substitution-box matrix over the enormously large problem space of 256!. Lastly, the security strength of obtained S-box is further elevated through the action of proposed algebraic group structure. The standard set of performance parameters such as nonlinearity, strict avalanche criterion, bits independent criterion, differential uniformity, and linear approximation probability is quantified to assess the security and robustness of proposed S-box. The simulation and comparison results demonstrate the effectiveness of proposed method for the construction of cryptographically sound S-boxes. (shrink)

Like most other sciences, behavior analysis adopts an assumption of uniformity, namely that principles discovered under controlled conditions apply outside the laboratory as well. Since the boundary between public and private depends on the vantage point of the observer, observability is not an inherent property of behavior. From this perspective, private events are assumed to enter into the same orderly relations as public behavior, and the distinction between public and private events is merely a practical one. Private (...) events play no role in the experimental analysis of behavior, but they permit us to make sense of many commonplace phenomena where controlled observation is impossible but unsystematic data are available. Such interpretive exercises serve both to guide research and to displace occult explanations. (shrink)

Laland et al. suggest that as a specific evolutionary force niche construction has entailed the encephalization of the brain. While not denying rapid co-evolution of brain traits and abilities with niches and cultures, I argue that encephalization reflects a classical genetic buffer system allowing rapid evolutionary adaptation independent of the nature of the selective pressure.

Behavioural flexibility is often treated as the gold standard of evidence for more sophisticated or complex forms of animal cognition, such as planning, metacognition and mindreading. However, the evidential link between behavioural flexibility and complex cognition has not been explicitly or systematically defended. Such a defence is particularly pressing because observed flexible behaviours can frequently be explained by putatively simpler cognitive mechanisms. This leaves complex cognition hypotheses open to ‘deflationary’ challenges that are accorded greater evidential weight precisely (...) because they offer putatively simpler explanations of equal explanatory power. This paper challenges the blanket preference for simpler explanations, and shows that once this preference is dispensed with, and the full spectrum of evidence—including evolutionary, ecological and phylogenetic data—is accorded its proper weight, an argument in support of the prevailing assumption that behavioural flexibility can serve as evidence for complex cognitive mechanisms may begin to take shape. An adaptive model of cognitive-behavioural evolution is proposed, according to which the existence of convergent trait–environment clusters in phylogenetically disparate lineages may serve as evidence for the same trait–environment clusters in other lineages. This, in turn, could permit inferences of cognitive complexity in cases of experimental underdetermination, thereby placing the common view that behavioural flexibility can serve as evidence for complex cognition on firmer grounds. (shrink)

BackgroundResearchers are working to identify dynamic factors involved in the shift from behavioral initiation to maintenance—factors which may depend on behavioral complexity. We test hypotheses regarding changes in factors involved in behavioral initiation and maintenance and their relationships to behavioral frequency over time, for a simple vs. complex behavior.MethodsData are secondary analyses from a larger RCT, in which young adult women, new to both behaviors, were randomly assigned to take daily calcium or to go for a daily, brisk (...) walk, for 4-weeks. Factors were measured weekly. Multi-level modeling evaluated their change over time. Bivariate correlations and multiple regression determined the relationships between factors and the subsequent-week behavioral frequency.FindingResults were partly in-line with expectations, in that individuals’ intentions and self-efficacy predicted initial behavioral engagement for both behaviors, and habit strength increased for both behaviors, becoming a significant predictor of behavioral frequency in later weeks of the study in some analyses. However, results depended on whether the outcome was self-reported or objectively measured and whether analyses were bivariate or multivariate.DiscussionThe factors theorized to play a role in behavioral maintenance started to develop, but only habit strength predicted behavioral frequency by study-end, for both behaviors. Differences in initiation and maintenance between behaviors of differing complexity may not be as stark as theorized, but longer follow-up times are required to evaluate maintenance factors. (shrink)

In this paper, a fresh shear-displacement model is developed for the plastic deformation of the bulk metallic glasses. The multiscale behavior in the shear banding process and the dynamics transition with the parameters are investigated in analytical form. We present a theoretical support for the transition from unstable states to stable states in the experiment by multiscale analysis and the stability analysis. With the small parameter increasing from negative to positive, the stability of the shear slipping displacement system changes, (...) and there is a limit cycle at the transition stage. Meanwhile, the phase diagram and the power spectrum also suggest that there is dynamics transition with the parameter changing. Moreover, the complexity is analyzed for different disturbance parameters, and it is coincident with the fact that the solution is more irregular for larger disturbance. In addition, we find that the amplitude of solution decreases with the temperature decreasing, which is consistent with the experimental results that the amplitude of the serration is smaller and smaller as the temperature decreases. (shrink)

The two-state-vector formalism presents a time-symmetric approach to the standard quantum mechanics, with particular importance in the description of experiments having pre- and post-selected ensembles. In this paper, using the correspondence limit of the quantum harmonic oscillator in the two-state-vector formalism, we produce harmonic oscillators that possess a classical behavior while having a complex-valued position and momentum. This allows us to discover novel effects that cannot be achieved otherwise. The proposed classical behavior does not describe the classical (...) physics in the usual sense since this behavior is subjected to the feature that only after the final measurement is performed, as a boundary condition, the complex-valued classical effects occur between the initial and the final boundary conditions. This classical behavior breaks down if one does not follow the decided boundary conditions during the experiment, since otherwise, one will contradict the impossibility of retrocausality. (shrink)

This paper studies the complexity of behavior of multi-agent systems. Behavior properties are formulated using classical temporal logic languages and are checked with respect to the transition system induced by the definition of the multi-agent system. We establish various tight complexity bounds of the behavior properties under natural structural and semantic restrictions on agent programs and actions.

In lieu of an abstract, here is a brief excerpt of the content:Philosophy, Psychiatry, & Psychology 9.1 (2002) 23-26 [Access article in PDF] The Complexity of Evil Behavior David E. Ward I WOULD LIKE TO BEGIN this reply by thanking the commentators. The reports of their clinical experience contained some interesting evidence regarding evil behavior that, I think, supports my thesis and their full frontal criticism has given me a chance to reemphasize how complex the problem of (...) evil behavior is.On the question raised by Steven Sverdlik, as to whether Kant was in possession of the idea of the unconscious: it never occurred to me that Kant's notion of the subreption of the will—the idea that we could somehow be deceived with regard to our true motives (1956, 121)—could be regarded as a reason for assuming that Kant had a concept of the unconscious. Certainly talk of being unsure of one's motives has been common currency in every age that has had the idea of acting out of duty as opposed to desire. This uncertainty allows us to think about unconscious motives and thus of a set of hidden mechanisms that might motivate our actions without our being aware of them. However, I think we would both agree that Kant nowhere articulates this hypothesis. Freud did articulate it. So I agree that I should have said that Kant was not in possession of a concept of unconscious mechanisms that may generate behavior in such a way as to be opaque to the agent involved.Sverdlik has two worries with regard to my thesis. The first concerns my characterization of evil behavior as wrongdoing for wrongdoing's sake. He believes that rather than insisting that all principled behavior must fit this formula, "Ward is really interested in wrongdoing that is non-impulsive and actuated by some principle, but not necessarily the satanic one." This is, indeed, exactly what I was interested in. It is the unconscious adherence to some principle that causes all the trouble for evil people. Sverdlik thinks that my proposal was "to attribute acceptance [of such principles] to the unconscious" and to maintain that though the agent does "not consciously accept it, [it] does do so unconsciously" (my emphasis). What I actually said was: In my account, there is a near-perfect dovetailing of the two different psychological perspectives—that of Kant's moral psychology (which lacks the resources to accommodate the possibility of evil) and that of Peck's psychiatric diagnosis of evil—that explains (on my construal) how an unconscious adherence to unacknowledged principles could be the driving power behind evil behaviour. What is the difference between unconscious acceptance of a principle and unconscious adherence to it? This difference can be illustrated in connection with Sverdlik's continuation of his argument: Ward suggests that the agent does not consciously accept it, but does so unconsciously. But why does the unconscious not see that it is not universalizable? And if it does see this, why does it proceed to act on it? Ward's picture of the unconscious must allow it to be rational enough to understand the narcissistic principle, for example, [protect your self-image at all costs] and to act on it. But if it is that rational, then it is puzzling that it does not draw the same conclusion [End Page 23] that the agent's conscious deliberation can and will draw. Therefore, if consciously acting on a non-universalizable principle is inexplicable, then so is unconsciously acting on it. According to my picture of the unconscious, what the unconscious is rational about are hypothetical principles: it sees the connection between means and ends with perfect rationality. When, in my article, I distinguished between categorical and hypothetical imperatives I pointed out that... it is clear that hypothetical principles like always dress in woolens can only motivate us if we already have a desire to be warm. Strictly speaking, hypothetical principles do not motivate us by themselves. They are only useful in specifying the means to an end that a rational person would follow if she wanted to satisfy a certain desire. (My emphasis.) I was assuming, then... (shrink)

Research on self-determination theory and clinical models such as acceptance and commitment therapy has shown that behaving in line with our values is key to maintaining healthy well-being. Combining work on values and experimental studies on moral hypocrisy and well-being, we experimentally tested how behaving incongruently with values affects well-being. We hypothesized that discrepancies between how one thinks one should have behaved and how one reported one did behave would be more detrimental to well-being when the behaviors were value-expressive and (...) motivationally coherent compared to a control condition; greater perceived gaps between how participants feel they should have acted and how they report they did act would be associated with more negative well-being outcomes; the relationship between value manipulation and well-being would be mediated by perceived behavioral gap; and that personal values would interact with value manipulation to produce differential effects on well-being. One-hundred and fifty-eight first-year psychology students participated in an experiment designed to highlight discrepancies between how participants have behaved in accordance with a certain value and how they think they should have behaved, before reporting their well-being. As hypothesized, greater discrepancies between reported past behavior and how participants thought they should have behaved was associated with negative affect and decreased reports of positive well-being. We found no evidence for differential effects of manipulated value-expressive behaviors on well-being, or for our hypotheses that personal values and manipulated value-expressive behaviors interact. Nevertheless, value content mattered in terms of inducing perceived behavioral gaps. Our study suggests that perceived discrepancies between any value and reported past behavior can have a negative impact on some aspects of well-being. We discuss how the application of our methodology can be used in further studies to disentangle the value-behavior nexus. (shrink)

We consider the role of habits in human individual and social ordinary life and we move from the fact that habitual behavior is fundamental to organize our activities in individual as well as in social contexts. Instead of considering classical and revised versions of intentionality, we prefer to focus on habits that reduce the complexity of daily life, and also on their corresponding activity in social life where we take part to informal joint practices as well as to institutionalized (...) ones. (shrink)

What happens when humans and birds engage each other through a collaboration-as-fantasy mediated by computers? Could such an exercise be modelled in a way that helps us to transcend the techno-ocularcentric fetishes for precision and certainty which demarcate our time? From Edgar Wind’s notion of 'incarnation' – as the place where empirical experience and metaphysical foundation meet in the single cognitive and experiential act – this article bridges the analogue with the digital, navigating nature’s strategies to embody inherited and learned (...) complex behaviours in the design of nests, in what I call data-nests. (shrink)

We received 23 spirited commentaries on our target article from across the disciplines of philosophy, economics, evolutionary genetics, molecular biology, criminology, epidemiology, and law. We organize our reply around three overarching questions: (1) What is a cause? (2) How are randomized controlled trials (RCTs) and within-family genome-wide association studies (GWASs) alike and unalike? (3) Is behavior genetics a qualitatively different enterprise? Throughout our discussion of these questions, we advocate for the idea that behavior genetics shares many of the (...) same pitfalls and promises as environmentally oriented research, medical genetics, and other arenas of the social and behavioral sciences. (shrink)

Spatial predator-prey models have been studied by researchers for many years, because the exact distributions of the population can be well illustrated via pattern formation. In this paper, amplitude equations of a spatial Holling–Tanner predator-prey model are studied via multiple scale analysis. First, by amplitude equations, we obtain the corresponding intervals in which different kinds of patterns will be onset. Additionally, we get the conclusion that pattern transitions of the predator are induced by the increasing rate of conversion into predator (...) biomass. Specifically, pattern transitions of the predator between distinct Turing pattern structures vary in an orderly manner: from spotted patterns to stripe patterns, and finally to black-eye patterns. Moreover, it is discovered that pattern transitions of prey can be induced by cross-diffusion; that is, patterns of prey transmit from spotted patterns to stripe patterns and finally to a mixture of spot and stripe patterns. Meanwhile, it is found that both effects of cross-diffusion and interaction between the prey and predator can lead to the complicated phenomenon of dynamics in the system of biology. (shrink)

The processes in construction are more likely than others to breed unsafe behaviors, and the consequences of these actions can be serious. This paper first reviews the research status on unsafe behavior in construction teams. It then analyzes the complex mechanisms that lead to unsafe behavior and constructs a three-layer structural model based on agent-based modeling technology. This modeling deals with complexity and elaborates on key points and potential research ideas in the study of unsafe behavior (...) in construction teams. Using the ABM method, the effects of different incentive strategies on the safe behavior of construction teams under different management scenarios were studied. The results showed that when members have a fair perception of the situation, the effect of the excess performance reward distribution, according to the member’s safety awareness level, is better than the average distribution effect. This is the case whether the member’s safety behavior level is positively or negatively related to the member’s safety awareness level. This study proves the feasibility, validity, and universality of the three-layer structural model. It also reaches certain management conclusions and ideas for further development. The purpose of this paper is to provide a reference for research on the containment and prevention of unsafe behavior in construction teams. (shrink)

This paper argues that collective intentionality analysis (principally as drawn from the work of Raimo Tuomela) provides a theoretical framework, complementary to traditional instrumental rationality analysis, that allows us to explain economic behavior as ‘complex.’ Economic behavior may be regarded as complex if it cannot be reduced to a single explanatory framework. Contemporary mainstream economics, in its reliance on instrumental rationality as the exclusive basis for explaining economic behavior, does not offer an account of economic (...) behavior as complex. Coupling collective intentionality analysis with instrumental rationality analysis, however, makes such an account possible, since collective intentionality analysis arguably presupposes a distinct form of rationality, here labeled a deontological or principle-based rationality. (shrink)

This paper argues that collective intentionality analysis (principally as drawn from the work of Raimo Tuomela) provides a theoretical framework, complementary to traditional instrumental rationality analysis, that allows us to explain economic behavior as ‘complex.’ Economic behavior may be regarded as complex if it cannot be reduced to a single explanatory framework. Contemporary mainstream economics, in its reliance on instrumental rationality as the exclusive basis for explaining economic behavior, does not offer an account of economic (...) behavior as complex. Coupling collective intentionality analysis with instrumental rationality analysis, however, makes such an account possible, since collective intentionality analysis arguably presupposes a distinct form of rationality, here labeled a deontological or principle-based rationality. (shrink)

Open peer commentary on the article “Homeostats for the 21st Century? Simulating Ashby Simulating the Brain” by Stefano Franchi. Upshot: The target article has addressed core concepts of Ashby’s generalized homeostasis thesis as well as its relevance to building complex artificial systems. In this commentary, I discuss Ashby-inspired approaches to designing for ultrastable behaviour in robots and the extent to which complex adaptive behaviour can be underdetermined by heteronomous constraints.

Action theory has given rise to some perplexing puzzles in the past half century. The most prominent one can be summarized as follows: What distinguishes intentional from unintentional acts? Thanks to the ingenuity of philosophers and their thought experiments, we know better than to assume that the difference lies in the mere presence of an intention, or in its causal efficacy in generating the action. The intention might be present and may also cause the intended behavior, yet the (...) class='Hi'>behavior may not be an intentional action; it may not be an action at all. The classic example is that of the nervous nephew who intends to kill his uncle to inherit his estate, and whose intention makes him so nervous as to drive recklessly, thereby running over a pedestrian... who happens to be his very uncle. The intention to kill is present and it causes the killing, yet the killing is not an intentional action. Rather, what appears to distinguish intentional from non-intentional action is voluntary control of the proper sort, and what distinguishes action from non-action is behavior caused in a particular manner. But spelling out the sort and specifying the manner have proven vexing tasks. (shrink)

The claimed link between dominance and free testosterone is an intriguing one but problems remain in attempting to link this single hormonal measure to human behaviour. These include the heterogeneous nature of dominance, the precise nature of the correlation(s), and whether only testosterone is important.

To survive in a competitive environment, small and medium enterprises have had to adapt to the digital environment in order to adjust to customer needs globally, particularly in the post-COVID-19 world. The advantages of cloud computing provide opportunities for SMEs with a restricted budget and limited resources. To understand how SMEs adopt cloud computing in a complex digital environment, this study examines how antecedents combine with each other to explain the high adoption of cloud computing. From the perspectives of (...) holism and set theory, we draw on complexity and configuration theories, present a conceptual model including seven antecedents based on the technology-organization-environment framework, and conduct an asymmetric fuzzy-set qualitative comparative analysis. Through an empirical study with 123 Chinese companies, we identify nine combinations of determinant antecedents that lead to the high adoption of cloud computing. The results show that none of the factors are indispensable to explain a high adoption on their own; instead, they are insufficient but necessary parts of the causal combinations that explain a high adoption. This study contributes to the literature on cloud computing adoption by extending current knowledge on how antecedents combine to increase the adoption and identify specific patterns of SMEs for whom these factors are essential and greatly influence their adoption. (shrink)