Can a low-cost eye-tracker assess the impact of a valent stimulus? A study replicating the visual backward masking paradigm

Capturing affective response to valent stimuli using eye-tracking is not only of interest to academic research, but also to commercial equipment developers (e.g., car dashboards). In order to investigate whether a low-cost eye-tracker can effectively detect participants’ physiological response to negatively valent stimuli, forty-four participants aged 19-24 (mean = 24.7, SD = 5.8) were recruited to complete the visual backward masking paradigm in a repeated-measures experimental design. Saccadic duration and pupil sizes were recorded using a lower-end 60-hz tracker. Data was analysed using a mix of parametric and non-parametric tests. Our results suggest that valence in the form of fearful vs neutral faces has a significant main effect on both saccadic duration [V = 931, p < 0.001, d = 0.96] and pupil size [t(43) = 29.81, p < 0.001, d = 3.91)]. Our findings were further supported by Bayes Factor analysis, which showed that saccadic duration data was 24 times more likely to occur, and pupil size measurement data was 89 times more likely, under the alternative hypothesis, showing that differences in valence had a main effect. The combined evidence produced by our Bayesian analysis, the large effect sizes of our frequentist analysis, and the significant effect on two separate measurements lead us to suggest that, under the right conditions, low-cost eye trackers can successfully detect changes in saccadic duration and pupil sizes as a result of physiological responses to threat-relevant visual stimuli

Sequential approach to joint flow-seismic inversion for improved characterization of fractured media

Seismic interpretation of subsurface structures is traditionally performed without any account of flow behavior. Here we present a methodology for characterizing fractured geologic reservoirs by integrating flow and seismic data. The key element of the proposed approach is the identification—within the inversion—of the intimate relation between fracture compliance and fracture transmissivity, which determine the acoustic and flow responses of a fractured reservoir, respectively. Owing to the strong (but highly uncertain) dependence of fracture transmissivity on fracture compliance, the modeled flow response in a fractured reservoir is highly sensitive to the geophysical interpretation. By means of synthetic models, we show that by incorporating flow data (well pressures and tracer breakthrough curves) into the inversion workflow, we can simultaneously reduce the error in the seismic interpretation and improve predictions of the reservoir flow dynamics. While the inversion results are robust with respect to noise in the data for this synthetic example, the applicability of the methodology remains to be tested for more complex synthetic models and field cases.Eni-MIT Energy Initiative Founding Member ProgramKorea (South). Ministry of Land, Transportation and Maritime Affairs (15AWMP-B066761-03

Mirror of modernity: invented traditions of modern Japan

This collection of essays challenges the notion that Japan's present cultural identity is the simple legacy of Japan's premodern and insular past. Building on the pathbreaking historical analysis of British traditions, The Invention of Tradition , sixteen American and Japanese scholars examine "age-old" Japanese cultural practices, ranging from judo to labor management, and show these to be largely creations of the modern era

Peasant protests and uprisings in Tokugawa Japan

The Japanese peasant has been thought of as an obedient and passive subject of the feudal ruling class. Yet Tokugawa villagers frequently engaged in unlawful and disruptive protests. Moreover, the frequency and intensity of the peasants' collective action increased markedly at the end of the Tokugawa period. Stephen Vlastos's examination of the changing patterns of peasant protest in the Fukushima area shows that peasant mobilization was restricted both ideologically and organizationally and that peasants did not become a prime moving force in the Meiji Restoration