Digital watermarking is used for the copyright protection of multimedia documents like image. One problem in it is the desynchronization attacks of the watermark at the receiver. Here a channel model for watermark reception with non perfect synchronization is introduced. Under the given channel model the capacity of SCS water marking and imperfectly synchronized reception is derived. One import...

The traditional belief is that brain oscillations are important for human long-term memory, because they induce synchronized firing between cell assemblies which shapes synaptic plasticity. Therefore, most prior studies focused on the role of synchronization for episodic memory, as reflected in theta (∼5 Hz) and gamma (>40 Hz) power increases. These studies, however, neglect the role that is pl...

Adaptive coupling, where the coupling is dynamical and depends on the behaviour of the oscillators in a complex system, is one of the most crucial factors to control the dynamics and streamline various processes in complex networks. In this paper, we have demonstrated the occurrence of multi-stable states in a system of identical phase oscillators that are dynamically coupled. We find that the ...

OBJECTIVE To determine cortical oscillatory changes involved in migraine visual aura using magnetoencephalography (MEG). BACKGROUND Visual aura in the form of scintillating scotoma precedes migraine in many cases. The involvement of cortical spreading depression within striate and extra-striate cortical areas is implicated in the generation of the disturbance, but the details of its progressi...

Two major components form the basis of spoken word production: the access of conceptual and lexical/phonological information in long-term memory, and motor preparation and execution of an articulatory program. Whereas the motor aspects of word production have been well characterized as reflected in alpha-beta desynchronization, the memory aspects have remained poorly understood. Using magnetoen...

In awake rats a single recurrent larger tidal volume (deep breaths) occurs at regular intervals, followed by oscillations in arterial pressure and heart rate. In the present study we recorded the changes in blood pressure, heart rate and ventilation during the wakefulness-sleep cycle identified by electrocorticographic records in order to determine whether the deep breaths and cardiovascular os...

Synchrony is inevitable in many oscillating systems—from the canonical alignment of two ticking grandfather clocks, to mutual entrainment beating flagella or spiking neurons. Yet both biological and man-made systems provide striking examples spontaneous desynchronization, such as failure cascades alternating current power grids neuronal avalanches mammalian brain. Here, we generalize classical ...