Engineering Approaches to Illuminating Brain Structure and Dynamics

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Engineering Approaches to Illuminating Brain Structure and Dynamics Karl Deisseroth, Mark J. Schnitzer  Neuron  Volume 80, Issue 3, Pages 568-577 (October 2013) DOI: 10.1016/j.neuron.2013.10.032 Copyright © 2013 Elsevier Inc. Terms and Conditions

Figure 1 Optics and Protein Engineering Converge for Ca2+ Imaging in >1,200 CA1 Pyramidal Cells in Freely Moving Mice (A) An integrated microscope is equipped with a microendoscope to image CA1 neurons expressing the engineered Ca2+ indicator GCaMP3 under control of the Camk2a promoter. The base plate and microendoscope are fixed to the cranium for repeated access to the same field of view. Republished from Ziv et al., 2013. (B) Shown are 1,202 CA1 pyramidal cells (red somata) identified by Ca2+ imaging in a freely moving mouse atop a mean fluorescence image (green) of CA1. Vessels appear as dark shadows. Image courtesy of Yaniv Ziv and Lacey Kitch, Stanford University. (C) Example traces of [Ca2+]i dynamics from 15 cells. Scale bars denote 5% ΔF/F (vertical) and 10 s (horizontal). Neuron 2013 80, 568-577DOI: (10.1016/j.neuron.2013.10.032) Copyright © 2013 Elsevier Inc. Terms and Conditions

Figure 2 Materials Science and Optoelectronics Converge for Neural Interface Research Left: exploded-view layout of injectable semiconductor device for integrated stimulation/sensing/actuation, highlighting distinct layers for electrophysiological measurement (1), optical measurement (2), optical stimulation (3, micro-ILED array), and temperature sensing (4), all bonded to a releasable base for injection with a microneedle. Top right: injection and release of the microneedle. After insertion (left), artificial cerebrospinal fluid dissolves an external silk-based adhesive (middle) and the microneedle can be removed (right), leaving the active device in the brain. Bottom right: SEM of an injectable micro-LED array, 8.5 μm thick; flexible and rigid forms shown. Adapted with permission from Kim et al., 2013. Neuron 2013 80, 568-577DOI: (10.1016/j.neuron.2013.10.032) Copyright © 2013 Elsevier Inc. Terms and Conditions

Figure 3 Chemical Engineering, Bioengineering, and Photonics Give Rise to Circuit-Probing Hardware and Wetware Top: construction of a hydrogel from within tissue (CLARITY) creates a transparent mammalian brain for intact-system anatomical analysis; adapted from Chung et al., 2013. Bottom left: 2.3Å crystal structure of the channelrhodopsin optogenetic control tool enables directed protein engineering for enhanced interventional functionality; adapted from Kato et al., 2012. Bottom right: optogenetic neural interfaces deliver light from laser diodes or advanced LEDs; flexible fiberoptic control in freely moving mouse shown. Photo credit Inbal Goshen and Karl Deisseroth. Neuron 2013 80, 568-577DOI: (10.1016/j.neuron.2013.10.032) Copyright © 2013 Elsevier Inc. Terms and Conditions