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Author Demarse, Thomas B. ♦ Efranca, Eric ♦ Eleondopulos, Stathis ♦ Brewer, Gregory J. ♦ Ealagapan, Sankaraleengam ♦ Wheeler, Bruce C. ♦ Epan, Liangbin
Source Directory of Open Access Journals (DOAJ)
Content type Text
Publisher Frontiers Media S.A.
File Format HTM / HTML
Date Created 2015-09-11
Copyright Year ©2015
Language English
Subject Domain (in LCC) RC321-571
Subject Keyword Neuropsychiatry ♦ Cortex ♦ Biological psychiatry ♦ Cortical Synchronization ♦ Neurosciences ♦ Functional connectivity ♦ Dissociated neuronal culture ♦ Multielectrode array ♦ Internal medicine ♦ Medicine ♦ MEMS (Micro Electro Mechanical Systems)
Abstract We report the design and application of a MEMs device that permits investigators to create arbitrary network topologies. With this device investigators can manipulate the degree of functional connectivity among distinct neural populations by systematically altering their geometric connectivity in vitro. Each PDMS device was cast from molds and consisted of two wells each containing a small neural population of dissociated rat cortical neurons. Wells were separated by a series of parallel micrometer scale tunnels that permitted passage of axonal processes but not somata; with the device placed over an 8x8 microelectrode array, action potentials from somata in wells and axons in microtunnels can be recorded and stimulated. In our earlier report we showed that a one week delay in plating of neurons from one well to the other led to a filling and blocking of the microtunnels by axons from the older well resulting in strong directionality (older to younger) of both axon action potentials in tunnels and longer duration and more slowly propagating bursts of action potentials between wells. Here we show that changing the number of tunnels, and hence the number of axons, connecting the two wells leads to changes in connectivity and propagation of bursting activity. More specifically, the greater the number of tunnels the stronger the connectivity, the greater the probability of bursting propagating between wells, and shorter peak-to-peak delays between bursts and time to first spike measured in the opposing well. We estimate that a minimum of 100 axons are needed to reliably initiate a burst in the opposing well. This device provides a tool for researchers interested in understanding network dynamics who will profit from having the ability to design both the degree and directionality connectivity among multiple small neural populations.
ISSN 16625110
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study
Learning Resource Type Article
Publisher Date 2015-07-01
e-ISSN 16625110
Journal Frontiers in Neural Circuits
Volume Number 9

Source: Directory of Open Access Journals (DOAJ)