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Background The synchrony hypothesis postulates that precise temporal synchronization of different pools of neurons conveys information that is not contained in their firing rates. The synchrony hypothesis had been supported by experimental findings demonstrating that millisecond precise synchrony of neuronal oscillations across well separated brain regions plays an essential role in visual perception and other higher cognitive tasks [1]. Albeit, more evidence is being accumulated in favour of its role as a binding mechanism of distributed neural responses, the physical and anatomical substrate for such a dynamic and precise synchrony, especially zero-lag even in the presence of non-negligible delays, remains unclear. Here we propose a simple network motif that naturally accounts for zero-lag synchronization for a wide range of temporal delays [3]. We demonstrate that zero-lag synchronization between two distant neurons or neural populations can be achieved by relaying the dynamics via a third mediating single neuron or population. Methods We simulated the dynamics of two Hodgkin-Huxley neurons that interact with each other via an intermediate third neuron. The synaptic coupling was mediated through alpha-functions. Individual temporal delays of the arrival of pre-synaptic potentials were modelled by a gamma distribution. The strength of the synchronization and the phase-difference between each individual pairs were derived by cross-correlation of the membrane potentials. Results In the regular spiking regime the two outer neurons consistently synchronize with zero phase lag irrespective of the initial conditions. This robust zero-lag synchronization naturally arises as a consequence of the relay and redistribution of the dynamics performed by the central neuron. This result is independent on whether the coupling is excitatory or inhibitory and can be maintained for arbitrarily long time delays (see Fig. 1). Conclusion We have presented a simple and extremely robust network motif able to account for the isochronous synchronization of distant neural elements in a natural way. As opposed to other possible mechanisms of neural synchronization, neither inhibitory coupling, gap junctions nor precise tuning of morphological parameters are required to obtain zero-lag synchronized neuronal oscillation.
This essay deals with two retellings of Genesis: Thomas Mann's "Joseph and his brothers" and Anita Diamant's "The red tent". Both authors note the presence of implicit pagan tendencies among the women of Jacob's clan (Gen 31:19; 35:2) and develop this subtext for their respective ideological purposes. Thomas Mann creates a dichotomy between the backwardness of the pagan female realm and the progressive nature of the monotheistically-oriented patriarchs. The path toward modern humanist values comes from the likes of Jacob and Joseph rather than Rachel and Leah in Mann's novel. Anita Diamant, on the other hand, adopts the opposite attitude, namely, that the paganism of Rachel, Leah, as well as other women in Jacob's family, is a humane and natural form of spirituality in contrast to the bloodthirsty Yahwism of Jacob and his sons. The latter point is illustrated by the sacking of Shechem. In order to question the patriarchal stance of the Old Testament Diamant reverses the key values informing the theology of the Bible. Thus, in "The red tent" Jacob's wives venerate the Ashera in particular. The latter constitutes a challenge to the stance of the Deuteronomic History where the cult of the Ashera is viewed as a key reason behind God's decision to let the Babylonians destroy the Southern Kingdom of Judah. And since Mann's novel upholds the patriarchal spirit of the biblical text, Diamant enters into debate with the continuity of female disempowerment which reaches all the way from Genesis to "Joseph and his brothers".
In this paper, we introduce an extension of the XMG system (eXtensibleMeta-Grammar) in order to allow for the description of Multi-Component Tree Adjoining Grammars. In particular, we introduce the XMG formalism and its implementation, and show how the latter makes it possible to extend the system relatively easily to different target formalisms, thus opening the way towards multi-formalism.
Rawang [...] is a Tibeto-Burman language spoken by people who live in the far north of Kachin State in Myanmar (Burma), particularly along the Mae Hka ('Nmai Hka) and Maeli Hka (Mali Hka) river valleys (see map on back page); population unknown, although Ethnologue gives 100,000. In the past they had been called ‘Nung’, or (mistakenly) ‘Hkanung’, and are considered to be a sub-group of the Kachin by the Myanmar government. Until government policies put a stop to the clearing of new land in 1994, the Rawang speakers still practiced slash and burn farming on the mountainsides (they still do a bit, but only on already claimed land), in conjunction with planting paddy rice near the river. They are closely related to people on the other side of the Chinese border in Yunnan classified as either Dulong or Nu(ng) (see LaPolla 2001, 2003 on the Dulong language). In this paper, I will be discussing the word-class-changing constructions found in Rawang, using data of the Mvtwang (Mvt River) dialect of Rawang, which is considered the most central of those dialects in Myanmar and so has become something of a standard for writing and inter-group communication.
Winter's law again
(2007)
Since I discussed the scholarly literature on Winter’s law twenty years ago (1988), several important articles on the subject have appeared (Young 1990, Campanile 1994, Matasovic 1995, Derksen 2002, Dybo 2002, Patri 2005, Derksen 2007). As the law evidently continues to be controversial, it is important to look into the nature of the evidence and counter-evidence which is adduced. It appears that doubts about Winter’s law are largely the result of four types of misunderstanding.
We radio-tracked two male and one female Virginia northern flying squirrels (Glaucomys sabrinus fuscus) in the Allegheny Mountains of West Virginia at Snowshoe Mountain Resort, in winter 2003 and Canaan Valley National Wildlife Refuge in winter 2004, respectively, to document winter home range and habitat use in or near ski areas. Male home range size in the winter was larger than that reported for males during summer and fall, whereas the female home range we observed was smaller than those reported for summer and fall. However, winter habitat use was similar to summer and fall habitat use reported in other studies. Virginia northern flying squirrels foraged and denned in both red spruce (Picea rubens)-dominated forests and northern hardwood forests; however, selection of red spruce-dominated forests and open areas was greater than expected based on availability. Use of northern hardwood forest occurred less than expected based on availability. Male squirrels denned near, and routinely crossed, downhill ski slopes and unimproved roads during foraging bouts, whereas the female approached, but did not cross forest edges onto roads or trails.