Shattered Worlds: Political Trauma Amongst Young Activists in Post-Revolutionary Egypt

Based on qualitative testimonial research with Egyptian youth activists, this article argues that Egypt’s post-revolutionary aftermath has been profoundly traumatic. Trauma shatters one’s assumptive world as it confronts one with the fragility of existence and the possibility of immediate death. Activists experienced automatic psychological coping mechanisms of intrusion (e.g. dreams and nightmares) and numbing, but Egypt’s post-revolutionary social and political context inhibited the operationalisation of non-automatic, socially embedded, coping mechanisms of reintegration and reinterpretation. The former entails the reintegration of one’s experiences into an adjusted assumptive world through a shared holding space and the latter the reinterpretation of the suffered traumas through a positive outcome. In the absence of socially embedded coping mechanisms, due to political polarisation and a lack of positive revolutionary outcomes, Egypt’s social trauma deepened as is illustrated by the depoliticisation of activists as they tried to mend their shattered assumptive worlds

Two liquid states of matter: A new dynamic line on a phase diagram

It is generally agreed that the supercritical region of a liquid consists of one single state (supercritical fluid). On the other hand, we show here that liquids in this region exist in two qualitatively different states: "rigid" and "non-rigid" liquid. Rigid to non-rigid transition corresponds to the condition {\tau} ~ {\tau}0, where {\tau}is liquid relaxation time and {\tau}0 is the minimal period of transverse quasi-harmonic waves. This condition defines a new dynamic line on the phase diagram, and corresponds to the loss of shear stiffness of a liquid at all available frequencies, and consequently to the qualitative change of many important liquid properties. We analyze the dynamic line theoretically as well as in real and model liquids, and show that the transition corresponds to the disappearance of high-frequency sound, qualitative changes of diffusion and viscous flow, increase of particle thermal speed to half of the speed of sound and reduction of the constant volume specific heat to 2kB per particle. In contrast to the Widom line that exists near the critical point only, the new dynamic line is universal: it separates two liquid states at arbitrarily high pressure and temperature, and exists in systems where liquid - gas transition and the critical point are absent overall.Comment: 21 pages, 8 figure

Updating visual–spatial working memory during object movement

AbstractWorking memory enables temporary maintenance and manipulation of information for immediate access by cognitive processes. The present study investigates how spatial information stored in working memory is updated during object movement. Participants had to remember a particular location on an object which, after a retention interval, started to move. The question was whether the memorized location was updated with the movement of the object or whether after object movement it remained represented in retinotopic coordinates. We used saccade trajectories to examine how memorized locations were represented. The results showed that immediately after the object stopped moving, there was both a retinotopic and an object-centered representation. However, 200ms later, the activity at the retinotopic location decayed, making the memory representation fully object-centered. Our results suggest that memorized locations are updated from retinotopic to object-centered coordinates during, or shortly after object movement