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Wheeler, Bruce C. Chang, John Chi-Hung 2015-09-25T20:08:09Z 2015-09-25T20:08:09Z 10000-01-01 2002 2002 We also recorded neurons patterned by photoresist image transfer and found patterned neurons capable of firing action potentials. Their firing depended on neuronal communication as action potentials were suppressed by high magnesium media. In addition, we found that network activity depended on network morphology. Well-confined networks fired action potentials independent of cell density and varied minimally in activity level, while less-confined networks had both greater dependence and variation. We attributed this effect to the greater glia:neuron interaction as both glial and synaptic density were higher in patterned than in random cultures. This interaction may depend on cell density, as synaptic density was equivalent in both patterned and random cultures when cultures were initiated at a lower plating density, implying that neuronal growth was stunted when culture is sparse. Currently, we cannot distinguish the direct effects of patterning on synaptic efficacy from the indirect effects of glia because our experiments were not designed to distinguish them. Future experiments should be conducted to test the hypothesis that distributed connectivity weakens the contribution of each synapse to cellular depolarization. Made available in DSpace on 2015-09-25T20:08:09Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3070271.pdf: 6053032 bytes, checksum: 548d1a730ef5ec1a2e0bf631a858c715 (MD5) Previous issue date: 2002 Embargo set by: Seth Robbins for item 82067 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 123 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2002. http://hdl.handle.net/2142/80785 (MiAaPQ)AAI3070271 eng Biology, Neuroscience Technologies for and Electrophysiological Studies of Structured, Living, Neuronal Networks on Microelectrode Arrays text Electrical Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.