IDeAS Seminar: Data-driven analysis of neuronal activity

Gal Mishne, Yale University
Nov 29 2017 - 2:30pm
Event type: 
224 Fine Hall

Recent advances in experimental methods in neuroscience enable the acquisition of large-scale, high-dimensional and high-resolution datasets. These complex and rich datasets call for the development of advanced data analysis tools, as commonly used techniques do not suffice to capture the spatiotemporal network complexity. In this talk I will present new data-driven methods based on global and local spectral embeddings for the processing and organization of high-dimensional datasets, and demonstrate their application to the analysis of neuronal measurements.  

We develop a new greedy adaptive spectral clustering method capable of handling overlapping clusters and disregarding clutter. Applied to in-vivo calcium imaging of neurons and apical dendrites, we extract hundreds of neuronal structures with detailed morphology, and demixed and denoised time-traces. Next we introduce a nonlinear, data-driven and model-free approach for the analysis of a spatiotemporal dynamical system, represented as a rank-3 tensor. Applying our methodology to neuronal measurements, we identify, solely from observations and in a purely unsupervised data-driven manner, functional subsets of neurons, activity patterns associated with particular behaviors and pathological dysfunction caused by external intervention.

Gal Mishne is a Gibbs Assistant Professor in the Applied Math program at Yale University, working with Ronald Coifman's research group. She completed her Ph.D. at the Viterbi Faculty of Electrical Engineering at the Technion in 2017, and holds a B.Sc. (summa cum laude) in Electrical Engineering and Physics from the Technion. Her research interests are high-dimensional data analysis methods based on manifold learning and diffusion geometry for computational neuroscience, image processing and biomedical signal processing.