# 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.

(95-0718) Large-scale-Ratio, Space-Time Chaos awarded by National Science Foundation (Principal Investigator). 1994 to 1996

(93-0423) Large-Aspect-Ratio Space-Time Chaos awarded by National Science Foundation (Principal Investigator). 1994 to 1995

(92-0050) CISE Research Instrumentation awarded by National Science Foundation (Co-Principal Investigator). 1992 to 1993

(92-0032) Parallel Numerical Simulation of Rayleigh-Be'nard Convection awarded by National Science Foundation (Principal Investigator). 1989 to 1993

(91-0026) Parallel Numerical Simulation of Rayleigh-Benard Convection awarded by National Science Foundation (Principal Investigator). 1989 to 1992

(89-0027) Parallel Numerical Simulations of Rayleigh-Benard Convection awarded by National Science Foundation (Principal Investigator). 1989 to 1991

## Pages

Tajima, S, and Greenside, HS. "Microextensive chaos of a spatially extended system." *Physical Review E - Statistical, Nonlinear, and Soft Matter Physics* 66.1 (2002): 017205/1-017205/4.
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Sensoy, B, and Greenside, H. "Pattern formation near onset of a convecting fluid in an annulus." *Phys Rev E Stat Nonlin Soft Matter Phys* 64.4 Pt 2 (October 2001): 046204-.
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Paul, MR, Cross, MC, Fischer, PF, and Greenside, HS. "Power-law behavior of power spectra in low Prandtl number Rayleigh-Bénard convection." *Physical Review Letters* 87.15 (2001): 154501/1-154501/4.

Sensoy, B, and Greenside, H. "Pattern formation near onset of a convecting fluid in an annulus." *Physical Review E - Statistical, Nonlinear, and Soft Matter Physics* 64.4 II (2001): 462041-4620410.

Cherry, EM, Greenside, HS, and Henriquez, CS. "A space-time adaptive method for simulating complex cardiac dynamics." *Phys Rev Lett* 84.6 (February 7, 2000): 1343-1346.
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Krystal, AD, West, M, Prado, R, Greenside, H, Zoldi, S, and Weiner, RD. "EEG effects of ECT: implications for rTMS." *Depress Anxiety* 12.3 (2000): 157-165. (Review)
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Zoldi, SM, Krystal, A, and Greenside, HS. "Stationarity and redundancy of multichannel EEG data recorded during generalized tonic-clonic seizures." *Brain Topogr* 12.3 (2000): 187-200.

Zoldi, SM, and Greenside, HS. "Spatially Localized Unstable Periodic Orbits Of A High-Dimensional Chaotic System." *Phys. Rev. E* 57.3 (March 1998): R2511-R2514. (Academic Article)

Krystal, AD, and Greenside, HS. "Low-dimensional chaos in bipolar disorder?." *Arch Gen Psychiatry* 55.3 (March 1998): 275-276. (Letter)

Epureanu, BI, and Greenside, HS. "Fractal basins of attraction associated with a damped Newton's method." *SIAM Review* 40.1 (1998): 102-109.