• Kiran M Kolwankar

      Articles written in Pramana – Journal of Physics

    • Learning and structure of neuronal networks

      Kiran M Kolwankar Quansheng Ren Areejit Samal Jürgen Jost

      More Details Abstract Fulltext PDF

      We study the effect of learning dynamics on network topology. Firstly, a network of discrete dynamical systems is considered for this purpose and the coupling strengths are made to evolve according to a temporal learning rule that is based on the paradigm of spike-time-dependent plasticity (STDP). This incorporates necessary competition between different edges. The final network we obtain is robust and has a broad degree distribution. Then we study the dynamics of the structure of a formal neural network. For properly chosen input signals, there exists a steady state with a residual network. We compare the motif profile of such a network with that of the real neural network of 𝐶. elegans and identify robust qualitative similarities. In particular, our extensive numerical simulations show that this STDP-driven resulting network is robust under variations of model parameters.

    • Effect of heat source on the growth of dendritic drying patterns

      Kiran M Kolwankar Pulkit Prakash Shruthi Radhakrishnan Swadhini Sahu Aditya K Dharmadhikari Jayashree A Dharmadhikari Deepak Mathur

      More Details Abstract Fulltext PDF

      Shining a tightly-focussed but low-powered laser beam on an absorber dispersed in a biological fluid gives rise to spectacular growth of dendritic patterns. These result from localized drying of the fluid because of efficient absorption and conduction of optical energy by the absorber. We have carried out experiments in several biologically relevant fluids and have analysed patterns generated by different types of absorbers. We observe that the growth velocity of branches in the dendritic patterns can decrease below the value expected for natural drying.

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