Correlations Between Hysteretic Categorical and Continuous Judgments of Perceptual Stimuli Supporting a Unified Dynamical Systems Approach to Perception

Perception ◽  
2017 ◽  
Vol 47 (1) ◽  
pp. 44-66 ◽  
Author(s):  
S. Kim ◽  
T. D. Frank
Keyword(s):  
Dynamical Systems ◽  
Systems Approach ◽  
Brain Activity ◽  
Equation Model ◽  
Measurement Scale ◽  
Systems Perspective ◽  
Within Subjects ◽  
Scale Measure ◽  
Positive Correlations ◽  
Experimental Findings

We report from two variants of a figure-ground experiment that is known in the literature to involve a bistable perceptual domain. The first variant was conducted as a two-alternative forced-choice experiment and in doing so tested participants on a categorical measurement scale. The second variant involved a Likert scale measure that was considered to represent a continuous measurement scale. The two variants were conducted as a single within-subjects experiment. Measures of bistability operationalized in terms of hysteresis size scores showed significant positive correlations across the two response conditions. The experimental findings are consistent with a dualistic interpretation of self-organizing perceptual systems when they are described on a macrolevel by means of so-called amplitude equations. This is explicitly demonstrated for a Lotka–Volterra–Haken amplitude equation model of task-related brain activity. As a by-product, the proposed dynamical systems perspective also sheds new light on the anchoring problem of producing numerical, continuous judgments.

A New Avenue of Research for Improving the Predictability of Weather Extremes - The Eastern Mediterranen as a Case Study

2020 ◽  
Author(s):  
Assaf Hochman ◽  
Pinhas Alpert ◽  
Hadas Saaroni ◽  
Tzvi Harpaz ◽  
Joaquim G. Pinto ◽  
...  
Keyword(s):  
Dynamical Systems ◽  
Systems Approach ◽  
Eastern Mediterranean ◽  
Extreme Weather ◽  
Extreme Weather Events ◽  
Weather Extremes ◽  
Systems Perspective ◽  
Weather Events ◽  
The Mediterranean

<p>Extreme weather events have long been considered challenging to predict. It is likely that global warming will trigger extreme weather in many regions of the globe and especially over the Mediterranean ´hot spot´. Therefore, extreme weather events have been selected as one of the grand challenges of the World Climate Research Program.</p><p>The intrinsic predictability of a weather system, or any dynamical system, depends on its persistence and its active number of degrees of freedom. Recent developments in dynamical systems theory allow to compute these metrics for atmospheric configurations (1). In most of the mid-latitudes, synoptic scale patterns exert a strong control on regional weather, thus, stimulating a broad interest, especially in weather forecasting. Recently, we have integrated the dynamical systems approach with a synoptic classification algorithm over the Eastern Mediterranean (2).  It was shown that the dynamical systems perspective provides an extremely informative tool for evaluating the predictability of synoptic patterns and especially of weather extremes.</p><p>The novel perspective, which leverages a dynamical systems approach to investigate the predictability of extreme weather events, outlines a new avenue of research that may be fruitfully applied at operational weather and climate forecasting services in the Mediterranean Region and around the globe.</p><p><strong>References</strong></p><ol><li>Faranda D, Messori G, Yiou P. 2017. Dynamical Proxies of North Atlantic Predictability and Extremes. Scientific Reports <strong>7</strong>, 412782017b. DOI: 10.1038/srep4127</li> <li>Hochman A, Alpert P, Harpaz T, Saaroni H, Messori G. 2019. A New Dynamical Systems Perspective on Atmospheric Predictability; Eastern Mediterranean Weather Regimes as a Case Study. Science Advances <strong>5</strong>. DOI: 10.1126/sciadv.aau0936</li> </ol>

A Dynamical Systems Perspective on Music

1997 ◽  
Vol 15 (4) ◽  
pp. 529-545
Author(s):  
David Burrows
Keyword(s):  
Dynamical Systems ◽  
Systems Perspective

Rise and Fall

2000 ◽  
Vol 24 (4) ◽  
pp. 727-754 ◽  
Author(s):  
Christopher Chase-Dunn ◽  
E. Susan Manning ◽  
Thomas D. Hall
Keyword(s):  
Political Economy ◽  
Systems Approach ◽  
World Systems ◽  
Central Concept ◽  
Global System ◽  
Systems Perspective ◽  
Early States ◽  
The Past ◽  
The World ◽  
Regional System

The world-systems perspective was invented for modeling and interpreting the expansion and deepening of the capitalist regional system as it emerged in Europe and incorporated the whole globe over the past 500 years (Wallerstein 1974; Chase-Dunn 1998; Arrighi 1994). The idea of a core/periphery hierarchy composed of “advanced” economically developed and powerful states dominating and exploiting “less developed” peripheral regions has been a central concept in the world-systems perspective. In the last decade the world-systems approach has been extended to the analysis of earlier and smaller intersocietal systems. Andre Gunder Frank and Barry Gills (1994) have argued that the contemporary global political economy is simply a continuation of a 5,000-year-old world system that emerged with the first states in Mesopotamia. Christopher Chase-Dunn and Thomas Hall (1997) have modified the basic world-systems concepts to make them useful for a comparative study of very different kinds of systems. They include very small intergroup networks composed of sedentary foragers, as well as larger systems containing chiefdoms, early states, agrarian empires, and the contemporary global system in their scope of comparison.

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