# Henry Greenside

## Professor of Physics

### Overview

After working in nonlinear dynamics and nonequilibrium pattern formation for many years, my research group has begun studying problems in theoretical neurobiology in collaboration with Professor Richard Mooney's experimental group on birdsong at Duke University. The main scientific question we are interested in is how songbirds learn to sing their song, which is a leading experimental paradigm for the broader neurobiology question of how animals learn behaviors that involve sequences of time. My group is interested in problems arising at the cellular and network levels (as opposed to behavioral levels). One example is understanding the origin, mechanism, and eventually the purpose of highly sparse high-frequency bursts of spikes that are observed in the nucleus HVC of songbird brains (this is the first place where auditory information seems to be combined with motor information). A second example is to understand how auditory and motor information are combined, e.g., there are data that suggests that the same group of neurons that instruct the respiratory and syringeal muscles to produce song (again in nucleus HVC) are also involved in recognizing song. A third example is trying to understand changes in anatomy (increases in spine stability) that were recently observed in living brain tissue as a bird learns its song.

Greenside, HS, Reiman, AH, and Salas, A. "Convergence properties of a nonvariational 3D MHD equilibrium code." *Journal of Computational Physics* 81.1 (1989): 102-136.
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Greenside, HS, Cross, MC, and Jr, WMC. "Mean flows and the onset of chaos in large-cell convection." *Physical Review Letters* 60.22 (1988): 2269-2272.
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Reiman, AH, and Greenside, HS. "Numerical solution of three-dimensional magnetic differential equations." *Journal of Computational Physics* 75.2 (1988): 423-443.
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Zweben, SJ, Manos, D, Budny, RV, Efthimion, P, Fredrickson, E, Greenside, H, Hill, KW, Hiroe, S, Kilpatrick, S, McGuire, K, Medley, SS, Park, HK, Ramsey, AT, and Wilgen, J. "Edge turbulence measurements in TFTR." *Journal of Nuclear Materials* 145-147.C (1987): 250-254.

Cross, MC, Tesauro, G, and Greenside, HS. "Wave-number selection and persistent dynamics in models of convection." *Physica D* 23.1-3 (December 1986): 12-18. (Academic Article)

Reiman, A, and Greenside, H. "Calculation of three-dimensional MHD equilibria with islands and stochastic regions." *Computer Physics Communications* 43.1 (1986): 157-167.

Cross, MC, Tesauro, G, and Greenside, HS. "Wavebumber selection and persistent dynamics in models of convection." *Physica D: Nonlinear Phenomena* 23.1-3 (1986): 12-18.
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Greenside, HS, and Cross, MC. "Stability analysis of two-dimensional models of three-dimensional convection." *Physical Review A* 31.4 (1985): 2492-2501.
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Greenside, HS, and Coughran, WM. "Nonlinear pattern formation near the onset of Rayleigh-Bénard convection." *Physical Review A* 30.1 (1984): 398-428.
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Greenside, HS, Budny, RV, and Post, DE. "Depolarization of d-t plasmas by recycling in material walls." *Journal Of Vacuum Science \& Technology A-vacuum Surfaces And Films* 2.2 (1984): 619-629. (Academic Article)