# 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, 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, and Schlater, M. "Pseudopotentials for the 3d transition-metal elements." *Physical Review B* 28.2 (1983): 535-543.
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Greenside, HS, and Schlüter, MA. "Pseudopotential calculation of the ground-state properties of ferromagnetic bcc iron." *Physical Review B* 27.5 (1983): 3111-3114.
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Greenside, HS, Wolf, A, Swift, J, and Pignataro, T. "Impracticality of a box-counting algorithm for calculating the dimensionality of strange attractors." *Physical Review A* 25.6 (1982): 3453-3456.
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Greenside, HS, Jr, WMC, and Schryer, NL. "Nonlinear pattern formation near the onset of Rayleigh-Bénard convection." *Physical Review Letters* 49.10 (1982): 726-729.
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Greenside, HS, Ahlers, G, Hohenberg, PC, and Walden, RW. "A simple stochastic model for the onset of turbulence in Rayleigh-Bénard convection." *Physica D: Nonlinear Phenomena* 5.2-3 (1982): 322-334.

Hamann, DR, Mattheiss, LF, and Greenside, HS. "Comparative LCAO-LAPW study of C1 chemisorption on the Ag(001) surface." *Physical Review B* 24.10 (1981): 6151-6155.
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Bachelet, GB, Greenside, HS, Baraff, GA, and Schlter, M. "Structural-energy calculations based on norm-conserving pseudopotentials and localized Gaussian orbitals." *Physical Review B* 24.8 (1981): 4745-4752.
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Greenside, HS, Blount, EI, and Varma, CM. "Possible coexisting superconducting and magnetic states." *Physical Review Letters* 46.1 (1981): 49-53.
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Greenside, HS, and Helfand, E. "NUMERICAL INTEGRATION OF STOCHASTIC DIFFERENTIAL EQUATIONS - 2." *The Bell System technical journal* 60.8 (1981): 1927-1940.