FOR 2093

C4: Synchronization in memristively pulse-coupled oscillator networks – experiments

Temporal synchrony of firing neuronal ensembles is considered as a key ingredient to explain higher brain functions such as perception or consciousness. The underlying basic feature is known as the binding problem in neuroscience. The spatial and temporal mechanism for the "binding" of different features of an object, such as color and shape, leading to entire object representation in a brain is not fully understood and explored. Spiking neurons can be electronically represented by relaxation type oscillators. Based on programmable unijunction transistors (PUTs) and operational amplifiers the non-linear dynamics, i.e. phase portraits, bifurcation, phase response curves of two and ensembles of relaxation type oscillators are investigated. Neuronal justified mechanism like Poisson distributed firing rates of individual neurons as well as signal retardation and variable coupling strength will be implemented by delay lines and memristive devices, respectively. While discrete oscillator networks will be investigated to understand the fundamental dynamical aspects of signal delay and variable strength coupling, higher integrated networks will be built-in a 250 nm CMOS technology. Finally, likewise topological aspects, as known from hippocampal micro circuits, as well as synchrony mechanism, will be studied in the framework of time-varying networks.