High-speed optical imaging and microscopy of whole-brain activity

Summary

Date: 
October 1, 2019 - 12:00pm
Location: 
Bio. Labs 1080
About the Speaker
Name: 
Elizabeth Hillman
Speaker Title: 
Professor
Speaker Affiliation: 
Columbia University

The past decade has seen dramatic improvements in genetically-encoded reporters of neural activity. However, capturing this activity at high speeds, over large volumes of the in intact brain and nervous system has remained a significant challenge. One technology that we have developed to address this need is swept confocally aligned planar excitation (SCAPE) microscopy. SCAPE is a type of light sheet microscopy, but utilizes a novel scanning-descanning strategy to enable very high-speed volumetric cellular imaging with a versatile single, stationary objective at the sample. We are applying SCAPE to imaging awake, behaving organisms such as freely crawling C. elegans, Drosophila larvae, the whole brain of behaving adult Drosophila, zebrafish brain and heart, the awake mouse cortex and intact mouse olfactory epithelium. We are also extending SCAPE to two-photon, meso-scale and higher resolution configurations, as well as developing platforms for high-throughput and high-content imaging of intact, cleared and expanded tissues.

We have also developed wide-field optical mapping (WFOM) methods for real-time imaging of both neural activity and hemodynamics over the entire dorsal cortex in awake, behaving mice. This simple, yet powerful method enables longitudinal imaging of mice for a wide range of studies. We are using WFOM to study the mechanistic basis of neurovascular coupling, and the neural origins of signals detected in resting state fMRI in a range of conditions, including exploring the effects of drugs and disease on both behaviors and the neural and hemodynamic representations of those behaviors.

Both of these techniques are providing new high-speed, real time views of brain-wide activity in awake, behaving animals, providing fundamentally new observations of spontaneous activity and behavior. I will present our latest progress on high-speed imaging technique development, and showcase our work applying these techniques to understand whole-brain activity in the context of awake behavior and resting state networks.